Relevant bibliographies by topics / Hydraulic Rating Method / Journal articles
To see the other types of publications on this topic, follow the link: Hydraulic Rating Method.

Journal articles on the topic 'Hydraulic Rating Method'

Author: Grafiati
Published: 6 September 2023
Last updated: 7 September 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Hydraulic Rating Method.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Hansen, David, Vinod K. Garga, and D. Ronald Townsend. "Selection and application of a one-dimensional non-Darcy flow equation for two-dimensional flow through rockfill embankments." Canadian Geotechnical Journal 32, no. 2 (April 1, 1995): 223–32. http://dx.doi.org/10.1139/t95-025.

Full text
Abstract:
Porous embankments comprised of relatively homogeneous coarse rockfill can be used to reduce the amount of spillage at downstream hydro dams or to control the outflow from stormwater detention basins. The stage-discharge rating curve is important in the design of such applications. In general, the coarseness of the material causes the flow to be non-Darcy; that is, characterized by a nonlinear relationship between bulk velocity and hydraulic gradient. Six one-dimensional (1D) non-Darcy flow equations, appearing in the literature, are presented. A limited comparison between computed and experimental results is then made on the basis of 1D packed-column tests performed in the hydraulics laboratory of the University of Ottawa. The question as to how such 1D closed-conduit equations might be used to estimate the quantity of flow through a porous embankment is then addressed, considering that the latter has a free surface and is a two-dimensional (2D) flow. The problem is successfully dealt with using the concept of "effective hydraulic gradient," a concept reminiscent of the method of sections used to analyze confined 2D seepage problems. A general equation is presented in which the effective hydraulic gradient is shown to be a function of two factors: (1) the shape of the embankment and (2) the upstream depth, relative to the height of the dam. The development and verification of the equation for the effective hydraulic gradient is described, together with its use in obtaining a rating curve for a hypothetical flowthrough dam composed of rock material 0.25 m in diameter. Key words : non-Darcy flow, flowthrough rockfill, effective hydraulic gradient, stage-discharge rating curve.
APA, Harvard, Vancouver, ISO, and other styles
2

Pedersen, Øyvind, Jochen Aberle, and Nils Rüther. "Hydraulic scale modelling of the rating curve for a gauging station with challenging geometry." Hydrology Research 50, no. 3 (February 19, 2019): 825–36. http://dx.doi.org/10.2166/nh.2019.044.

Full text
Abstract:
Abstract Direct discharge measurements during flood events can be challenging from a technical as well as from a safety point of view. Therefore, flood discharges are often estimated by extrapolating a rating curve. Extrapolations far outside the range of the directly measured discharges are common, although the associated errors can be large. In this article, a novel method to determine suitable stage measurement locations and derive rating curves using a hydraulic scale model is presented. A hydraulic scale model for a natural gauging station site is produced with a computer numerical control technique, making a detailed representation of the prototype topography and bathymetry. The site is characterized by a complex geometry, and the results of the scale model study reveal that the current location of stage measurement is not suitable for determining the rating curve for high flows. The scale model is used to identify potential locations for future stage measurements, and a flood rating curve is constructed based on field measurements for low flows and scale model data for high flows. The study shows how hydraulic scale modelling can be used to provide more reliable rating curves for large discharges and evaluate new or existing gauging stations located at sites with challenging measurement conditions.
APA, Harvard, Vancouver, ISO, and other styles
3

Zakariah, Ridzwan Bin, Norzila Binti Othman, Mohd Azlan bin Mohd Yusoff, and Wahid Ali Hamood Altowayti. "Determination of Stage Discharge Rating Curve at Sungai Batang Melaka." Journal of Southwest Jiaotong University 56, no. 3 (June 30, 2021): 248–61. http://dx.doi.org/10.35741/issn.0258-2724.56.3.21.

Full text
Abstract:
The river is a natural source of water with distinctive hydraulic features. The hydraulic characteristic is a factor in morphology changes. The article describes a determination of a stage discharge rating curve at Sungai Batang Melaka that has been developed for the first time. The stage discharge rating curve is used to determine whether the rivers of this area are the cause of floods that have occurred in Malacca. Based on data collection for width and depth at four locations, enabling to evaluate and analysis the data of each cross-section for Sungai Batang Melaka. By observing the river velocity, the condition of the river flow in the area will be obtained. The two-point method and mid-section method is used to measure the flow rates in the rivers. Following the calculation using Chezy-Manning’s equation, the authors research shows that this river produces a good stage discharge rating curve. Overall, a stage discharge rating curve for each location shows it is associated with gradation and degradation rates. From the findings, the outflow, storage capacity, and discharge rating curve in Sungai Batang Melaka were successfully obtained. It will benefit future studies, especially in facilitating measures to be taken to avoid flash floods that keep occurring in Malacca.
APA, Harvard, Vancouver, ISO, and other styles
4

Di Baldassarre, G., and A. Montanari. "Uncertainty in river discharge observations: a quantitative analysis." Hydrology and Earth System Sciences 13, no. 6 (June 25, 2009): 913–21. http://dx.doi.org/10.5194/hess-13-913-2009.

Full text
Abstract:
Abstract. This study proposes a framework for analysing and quantifying the uncertainty of river flow data. Such uncertainty is often considered to be negligible with respect to other approximations affecting hydrological studies. Actually, given that river discharge data are usually obtained by means of the so-called rating curve method, a number of different sources of error affect the derived observations. These include: errors in measurements of river stage and discharge utilised to parameterise the rating curve, interpolation and extrapolation error of the rating curve, presence of unsteady flow conditions, and seasonal variations of the state of the vegetation (i.e. roughness). This study aims at analysing these sources of uncertainty using an original methodology. The novelty of the proposed framework lies in the estimation of rating curve uncertainty, which is based on hydraulic simulations. These latter are carried out on a reach of the Po River (Italy) by means of a one-dimensional (1-D) hydraulic model code (HEC-RAS). The results of the study show that errors in river flow data are indeed far from negligible.
APA, Harvard, Vancouver, ISO, and other styles
5

O.O., Olukayode, Bayewu O.O., Adebisi N.O., Mosuro G.O., Ariyo S.O., and Orimogunje O.B. "Multi-Criteria Analysis Method for Aquifer Vulnerability Investigation Using Godt Method at Idi-Ayunre, Ibadan, Southwestern Nigeria." African Journal of Environment and Natural Science Research 6, no. 2 (August 1, 2023): 97–112. http://dx.doi.org/10.52589/ajensr-7df7dj7o.

Full text
Abstract:
Geophysical investigation involving Vertical Electrical Sounding (VES) Schlumberger array was carried out across Idi-Ayunre, Ibadan, a typical basement complex area having a rock composition of migmatite-gneiss, quartzite, and biotite-hornblende. A total of forty (40) vertical electrical sounding data were acquired with maximum current electrode separation of 100m using resistivity meter and its accessories. The aim of the study was to evaluate the aquifer vulnerability of the study area to contamination. The VES results were both qualitatively and quantitatively interpreted using partial curve matching and were further subjected to computer iteration using WINRESIST. The longitudinal conductance, thickness of layer overlying aquifer and hydraulic conductivity were generated and synthesized to produce the vulnerability map. A GODT multi-criteria model which is an acronym of Groundwater occurrence, Overburden thickness, Depth and Topography developed from the hydrogeologic parameters were evaluated alongside the longitudinal conductance values to determine the aquifer vulnerability of the area and to classify the study area accordingly. The curve type obtained are H and HA. The interpretation revealed three to four geoelectric layers: the topsoil (18.9-178.9Ωm), clayey (9.0-70.6Ωm), fractured basement (31.9-43.1Ωm) and fresh basement (1131-2916Ωm). The longitudinal unit conductance ranges from 0.032-0.93mhos. And from the GODT model derivations, the study area shows 92.5% of high vulnerability rating, 2.5% of low-moderate and 5% of moderate rating; areas with high rating are prone to contamination than areas with low-moderate and moderate rating. Hence, zones of high vulnerability may be not be encouraged for groundwater exploitation and, if need be, constant water quality assessment should be carried out before consumption.
APA, Harvard, Vancouver, ISO, and other styles
6

Guo, Zhuo Min, Gao Zhu, Yu Jing Bie, and Meng Jun Tang. "Influence of Hydraulic Factor of Vertical-Slot Fishway on Swimming Ability of Fish." Advanced Materials Research 594-597 (November 2012): 1988–92. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.1988.

Full text
Abstract:
Vertical-slot fishway is widely used in different shape of fish-way due to the adaptability to water level amplitude, the hydraulic characteristics of the vertical-slot fish-way of different scale has been extensively researched by researcher domestic and overseas, the energy dissipation mechanism and hydraulic characteristics of the fish-way in different scale under different inflow has been acquainted now. In this paper, the hydraulic characteristics of Vertical-slot fish-way of different size under water depth, inflow and slope is analyzed , influence of water depth, flow velocity, dissipation rating per unit volume and turbulent energy etc. On fish swimming ability is discussed, and design of fish-way is evaluated by relevant hydraulic factor of fish swimming characteristics. Finally the research method and experience abroad is summarized in the paper.
APA, Harvard, Vancouver, ISO, and other styles
7

Kavousizadeh, Amirreza, Mahmoud F. Maghrebi, and Arash Ahmadi. "Stage-discharge estimation in compound open channels with composite roughness." Hydrology Research 50, no. 3 (March 27, 2019): 809–24. http://dx.doi.org/10.2166/nh.2019.021.

Full text
Abstract:
Abstract Determination of stage-discharge relationships in natural rivers is extremely important in flood control projects. The importance of rating curves in rivers and the difficulty of its establishment show the need for simpler and more precise methods. Determination of rating curves in compound channels, especially with composite roughness, has proved to be difficult because of significant variations in hydraulic parameters from the main channel to the floodplains. In the current paper, a new approach that is based on the concept of the cross-sectional isovel contours is introduced for estimation of the stage-discharge curves in compound channels. The multivariate Newton's method is applied to the difference between the observed and estimated data to optimize the exponent values of the governing parameters. The proposed method is verified by comparing predictions obtained by using it with some experimental datasets. For compound channels with composite roughness, the stage-discharge curves obtained by the proposed method are more accurate than those obtained by using available conventional methods.
APA, Harvard, Vancouver, ISO, and other styles
8

Othman, Nariman Yahya, Zahra Abd Saleh, and Zainab Ali Omran. "Development of Stage – Distance – Discharge Relationship and Rating Curve using Least Square Method." Civil Engineering Journal 5, no. 9 (September 22, 2019): 1959–69. http://dx.doi.org/10.28991/cej-2019-03091385.

Full text
Abstract:
For any river, besides the importance of stage – discharge relationship (rating curve), a stage-discharge- distance relationship is of more significance. The accurate estimation of both relationships along a river reach is considered a key point for various applications of water resources engineering such as operation and management of water resources projects, designing of hydraulic structures, and sediment analysis. In this paper, both relationships were established for the Shatt Al – Hillah river reach by applying multiple linear regression and simple linear regression using least square method for determining regression equations. Twelve gauging stations including three primary and nine secondary stations were considered for this method. Moreover, for evaluating the performance of both regressions, statistical measures such as coefficient of determination, root mean square error, mean square error, and Thiel's factor were used. The study results generally indicate a superior performance of both modeling techniques. MLR model was able to predict and mimic the stage-discharge-distance relationship with a coefficient correlation of about 0.932, while SLR model was able to predict three rating curves for the three primary stations with coefficient correlation of about 0.960, 0.943, and 0.924 respectively.
APA, Harvard, Vancouver, ISO, and other styles
9

Kim, Yeonsu, Sungryul Oh, Seungsoo Lee, Jisun Byun, and Hyunuk An. "Application of Stage-Fall-Discharge Rating Curves to a Reservoir Based on Acoustic Doppler Velocity Meter Measurement Data." Water 13, no. 17 (September 5, 2021): 2443. http://dx.doi.org/10.3390/w13172443.

Full text
Abstract:
The applicability of the stage-fall-discharge (SFD) method in combination with acoustic Doppler velocity meter (ADVM) data, upstream of a hydraulic structure, specifically, the Sejong-weir located in the Geum River, Korea, was examined. We developed three rating curves: a conventional simple rating curve with the data measured using an acoustic Doppler current profiler (ADCP) and floating objects, an SFD rating curve with the data measured using the ADCP and floating objects, and an SFD rating curve with the data measured using an ADVM. Because of the gate operation effect, every rating curve involved many uncertainties under 1000 m3/s (3.13 m2/s, specific discharge). In terms of the hydrograph reconstruction, compared with the conventional simple rating curve, the SFD developed using ADVM data exhibited a higher agreement with the measured data in terms of the pattern. Furthermore, the measured discharge over 1000 m3/s primarily ranged between 97.5% and 2.5% in the graph comparing the ratio of the median and observed discharge. Based on this experiment, it is confirmed that the SFD rating curve with data to represent the backwater effect, such as ADVM data, can reduce the uncertainties induced by the typical rating curve
APA, Harvard, Vancouver, ISO, and other styles
10

Benkhaldoun, Fayssal, Mohammed Seaïd, and Slah Sahmim. "Mathematical Development and Verification of a Finite Volume Model for Morphodynamic Flow Applications." Advances in Applied Mathematics and Mechanics 3, no. 4 (August 2011): 470–92. http://dx.doi.org/10.4208/aamm.10-m1056.

Full text
Abstract:
AbstractThe accuracy and efficiency of a class of finite volume methods are investigated for numerical solution of morphodynamic problems in one space dimension. The governing equations consist of two components, namely a hydraulic part described by the shallow water equations and a sediment part described by the Exner equation. Based on different formulations of the morphodynamic equations, we propose a family of three finite volume methods. The numerical fluxes are reconstructed using a modified Roe’s scheme that incorporates, in its reconstruction, the sign of the Jacobian matrix in the morphodynamic system. A well-balanced discretization is used for the treatment of the source terms. The method is well-balanced, non-oscillatory and suitable for both slow and rapid interactions between hydraulic flow and sediment transport. The obtained results for several morphodynamic problems are considered to be representative, and might be helpful for a fair rating of finite volume solution schemes, particularly in long time computations.
APA, Harvard, Vancouver, ISO, and other styles
11

Kalioudjoglou, Loïck, Clément Bonneau, Vincent Melot, Bruno Auvity, Christophe Josset, and Yoann Merriaux. "Prediction or hydraulic performance of shell-and-tube heat exchanger: comparison of 1D and CFD-porous media approaches." MATEC Web of Conferences 240 (2018): 02008. http://dx.doi.org/10.1051/matecconf/201824002008.

Full text
Abstract:
The present paper deals with Heat Exchanger sizing methods and offers a comparison between two of them: 1D global method and CFD porous media method. Following Prithiviraj et al. work [1], new developments are based on recent knowledge acquired on porous media, using a coupling strategy of a three-dimensional commercial code with an in-house code library. The distributed hydraulic resistance concept and the numerical model are briefly described and confronted with pressure drop measurements from an experimental E-type STHE setup (shell-and-tube heat exchanger) from the literature. The present paper will put into perspective capabilities and limits of each method with needs for heat exchanger rating. Flow rate repartition is calculated with CFD-porous media using Tinker’s current approach. This new analysis provides a complete comparison with 1D global method. It also reveals the major impact of leakage flow rate between baffle and tubes. The numerical estimation of pressure losses, consistent with experimental measurements of Halle et al. [2], implies that our future work will include thermal performance characterization and geometrical optimization.
APA, Harvard, Vancouver, ISO, and other styles
12

Gericke, O. J., and V. H. Williams. "Could a one-size-fits-all approach apply to the extension of stage-discharge relationships at flow-gauging weirs?" Journal of the South African Institution of Civil Engineering 65, no. 2 (June 27, 2023): 17–27. http://dx.doi.org/10.17159/2309-8775/2023/v65n2a3.

Full text
Abstract:
At a flow-gauging weir, the stage or flow depth is normally measured continuously and converted into discharge using a stage-discharge (SD) rating curve (RC). During flood events, the observed water levels often exceed the flow-gauging weir's designed measuring capacity or structural limit. Subsequently, the standard calibration of the flow-gauging weir becomes irrelevant and the extension of the SD RC for above-structure-limit flow conditions is required. This paper attempts to identify a one-size-fits-all approach for the extension of SD RCs by assessing seven indirect hydraulic extension methods and a one-dimensional HEC-RAS modelling approach against direct SD measurements or extension methods at selected flow-gauging sites in South Africa. In considering a ranking-based selection procedure and associated goodness-of-fit (GOF) criteria, the stepped backwater analysis, slope-area method, and 1-D HEC-RAS steady flow modelling proved to be the most appropriate. The other indirect extension methods resulted in larger statistical differences between the at-site benchmark and modelled values. Given that the extension of RCs is significantly more affected by the site and river reach geometry, initial hydraulic conditions, flow regimes, and level of submergence at high discharges than the actual extension method used, it was confirmed that a one-size-fits-all approach cannot be applied for the extension of SD RCs in South Africa.
APA, Harvard, Vancouver, ISO, and other styles
13

Emamgholizadeh, Samad, and Razieh Karimi Demneh. "A comparison of artificial intelligence models for the estimation of daily suspended sediment load: a case study on the Telar and Kasilian rivers in Iran." Water Supply 19, no. 1 (March 17, 2018): 165–78. http://dx.doi.org/10.2166/ws.2018.062.

Full text
Abstract:
Abstract The estimation of the suspended sediment load in rivers is one of the main issues in hydraulic engineering. Different traditional methods such as the sediment rating curve (SRC) can be used to estimate the suspended sediment load of rivers. The main problem with this method is its low accuracy and uncertainty. In this study, the ability of three intelligence models namely: gene expression programming (GEP), artificial neural networks (ANN) and adaptive neuro fuzzy inference system (ANFIS) were compared with the SRC method. The daily flow discharge and sediment discharge at two hydrometric stations of the Kasilian and Telar rivers in the period of 1964–2014 were used to develop intelligence models. The performance of these methods indicated that all intelligence models give reliable results in the estimation of the suspended sediment load and their performance was better than the SRC method. Moreover, results showed that the GEP model with a high coefficient of determination (R2) and a low mean absolute error (MAE) was better than both the ANN and ANFIS models for the estimation of daily suspended sediment load of the two sub-basins of the Kasilian and Telar rivers.
APA, Harvard, Vancouver, ISO, and other styles
14

Samboko, Hubert T., Sten Schurer, Hubert H. G. Savenije, Hodson Makurira, Kawawa Banda, and Hessel Winsemius. "Evaluating low-cost topographic surveys for computations of conveyance." Geoscientific Instrumentation, Methods and Data Systems 11, no. 1 (January 25, 2022): 1–23. http://dx.doi.org/10.5194/gi-11-1-2022.

Full text
Abstract:
Abstract. Rapid modern technological advancements have led to significant improvements in river monitoring using unmanned aerial vehicles (UAVs), photogrammetric reconstruction software, and low-cost real-time kinematic Global Navigation Satellite System (RTK GNSS) equipment. UAVs allow for the collection of dry bathymetric data in environments that are difficult to access. Low-cost RTK GNSS equipment facilitates accurate measurement of wet bathymetry when combined with subaqueous measuring tools such as acoustic Doppler current profilers (ADCPs). Hydraulic models may be constructed from these data, which in turn can be used for various applications such as water management, forecasting, early warning and disaster preparedness by responsible water authorities, and construction of river rating curves. We hypothesise that the reconstruction of dry terrain with UAV-based photogrammetry combined with RTK GNSS equipment leads to accurate geometries particularly fit for hydraulic understanding and simulation models. This study sought to (1) compare open-source and commercial photogrammetry packages to verify if water authorities with low resource availability have the option to utilise open-source packages without significant compromise on accuracy; (2) assess the impact of variations in the number of ground control points (GCPs) and the distribution of the GCP markers on the quality of digital elevation models (DEMs), with a particular emphasis on characteristics that impact hydraulics; and (3) investigate the impact of using reconstructions based on different GCP numbers on conveyance and hydraulic slope. A novel method which makes use of a simple RTK tie line along the water edge measured using a low-cost but highly accurate GNSS is presented so as to correct the unwanted effect of lens distortion (“doming effect”) and enable the concatenation of geometric data from different sources. Furthermore, we describe how merging of the dry and wet bathymetry can be achieved through gridding based on linear interpolation. We tested our approach over a section of the Luangwa River in Zambia. Results indicate that the open-source software photogrammetry package is capable of producing results that are comparable to commercially available options. We determined that GCPs are essential for vertical accuracy, but also that an increase in the number of GCPs above a limited number of five only moderately increases the accuracy of results, provided the GCPs are well spaced in both the horizontal and vertical dimension. Furthermore, insignificant differences in hydraulic geometries among the various cross sections are observed, corroborating the fact that a limited well-spaced set of GCPs is enough to establish a hydraulically sound reconstruction. However, it appeared necessary to make an additional observation of the hydraulic slope. A slope derived merely from the UAV survey was shown to be prone to considerable errors caused by lens distortion. Combination of the photogrammetry results with the RTK GNSS tie line was shown to be essential to correct the slope and made the reconstruction suitable for hydraulic model setup.
APA, Harvard, Vancouver, ISO, and other styles
15

Badra, Attoui, Sayad Lamine, Benrabah Samia, and Daoud Rabia. "A GIS-BASED DRASTIC MODEL: THE BOUMAIZA PLAIN (NORTH-EAST ALGERIA)." Present Environment and Sustainable Development 14, no. 2 (October 14, 2020): 43–53. http://dx.doi.org/10.15551/pesd2020142003.

Full text
Abstract:
The plain of Boumaiza is located in the north east of Algeria in the wilaya of Skikda. This region is characterized by agricultural activity and is subject to a mediterranean climate. This agricultural development is liable to contaminate the groundwater heavily loaded by the local population for its drinking water needs. In order to highlight the state of vulnerability to groundwater pollution of the captive aquifer, which is composed of sands and gravels and pebbles, it is based on a marly substratum, GIS-based DRASTIC Index method has been applied in the aquifer of Boumaiza Plain. This method is presented in the form of numerical rating systems based on consideration of the different factors influencing the hydrogeological system, where a note and a weight are affected and varying with each parameter used. This method is based in the parameters like depth to the groundwater, net recharge, Aquifer media, soil media, topography, impact of the vadose zone, and hydraulic conductivity. The results show that the study area is characterized by a low and medium vulnerability to pollution.
APA, Harvard, Vancouver, ISO, and other styles
16

Zainab Haliru Ali, Buba Apagu Ankidawa, Jackson M. Ishaku, and Ahmed Buba Seli. "Delineation of Groundwater Potential Zones of Girei and Environs, Adamawa State, North Eastern Nigeria." Journal of Tropical Resources and Sustainable Science (JTRSS) 11, no. 1 (June 30, 2023): 43–54. http://dx.doi.org/10.47253/jtrss.v11i1.1097.

Full text
Abstract:
Evaluation of groundwater resources of Girei and environs is necessary in order to develop appropriate water supply scheme to the community. Cases of borehole failures have been on increase in the area due to a lack of knowledge of the aquifer geometry. The study is aimed at delineating the groundwater potential zones of Girei and environs with the objectives of delineating the different aquifer systems, estimating the aquifer characteristics such as transmissivity and hydraulic conductivity using the Dar Zarrouk parameter, determining groundwater flow direction, and identifying the recharged and discharged areas. Geological investigation indicates that the area underlain by Bima sandstone. Thirty profiles of Vertical Electrical Sounding using Schlunberger array method with the aid of ABEM signal averaging system (SAS 1000) was used to determine aquifer types and groundwater potential zones. Correlation between borehole lithological section and geoelectric section within the study area revealed a confineded aquifer type. The aquifer characteristics indicate that the transverse resistance ranged between 29.796 to 238000 ?m2, longitudinal conductance ranged between 0.0148 ?-1 to 9.34 ?-1, hydraulic conductivity values range from 0.0014 to 5.865 m/s with an average value of 0.0355 m/s. Transmissivity values obtained from the various layers range from 237.6 m2/day to 6324 m2/day. Aquifer rating based on transmissivity values reveals that the aquifers in the study area have moderate to high potential.
APA, Harvard, Vancouver, ISO, and other styles
17

Macák, Miroslav, Ladislav Nozdrovický, and Affan Othman Hussein. "Effect Of Preheating And Different Moisture Content Of Input Materials On Durability Of Pellets Made From Different Phytomass Content." Acta Technologica Agriculturae 18, no. 1 (March 1, 2015): 22–27. http://dx.doi.org/10.1515/ata-2015-0006.

Full text
Abstract:
Abstract This paper analyses the effects of the storage process on the durability of pellets made of different types of biomass (lucerne hay, maize stover, wheat straw, miscanthus, prickly lettuce) for energy purposes. Pellets were produced on a hydraulic press that allowed modifying the size of pellets. The durability of pellets was measured on a special testing instrument according to the ASAE S269.4 (2007) standard method. The pellets used in the test were produced by pressing without preheating and with preheating. Durability rating was expressed as the ratio of the original mass of pellets and the mass of pellets remaining on a 17 mm opening sieve after tumbling. Storage negatively affected the durability of pellets made without preheating for all the types of biomass materials in different moisture contents. On the other hand, there was some positive response to storing of pellets made with preheating. The durability of pellets made of maize stover, wheat straw and miscanthus in the moisture content of 5 % increased with storing.
APA, Harvard, Vancouver, ISO, and other styles
18

Suryadimal, Suryadimal. "Meta Analisis Pengembangan Assesment Kelayakan Sistim Pembangkit Tenaga Air." INVOTEK: Jurnal Inovasi Vokasional dan Teknologi 18, no. 2 (October 23, 2018): 123–32. http://dx.doi.org/10.24036/invotek.v18i2.260.

Full text
Abstract:
Abstract-This study aims to determine the feasibility assessment of hydroelectricity to feasibility studies that have been conducted in various developing and developed countries. In a feasibility study usually consider various important aspects such as technical and non technical aspects that will affect the productivity of a feasibility study.Methododologi research based on the meta-analysis method, in which the analysis is based on a review of a number of research results on similar issues in the case of a feasibility assessment of the power plant system. Approaches are based on journal articles and research reports that are taken based on their compatibility with the theme of research. The technical aspects used are hydraulic and civil aspects, mechanical and electrical aspects, while non technical aspects are economic, social and cultural aspects. So with the development of this feasibility rating model can be a reference for developers, government and investors to decide the feasibility of a power plant investment Keywords: Assessment Feasibility, Hydropower, Power Plant, Feasibility Study, Meta analysis
APA, Harvard, Vancouver, ISO, and other styles
19

Le Bihan, Guillaume, Olivier Payrastre, Eric Gaume, David Moncoulon, and Frédéric Pons. "The challenge of forecasting impacts of flash floods: test of a simplified hydraulic approach and validation based on insurance claim data." Hydrology and Earth System Sciences 21, no. 11 (November 28, 2017): 5911–28. http://dx.doi.org/10.5194/hess-21-5911-2017.

Full text
Abstract:
Abstract. Up to now, flash flood monitoring and forecasting systems, based on rainfall radar measurements and distributed rainfall–runoff models, generally aimed at estimating flood magnitudes – typically discharges or return periods – at selected river cross sections. The approach presented here goes one step further by proposing an integrated forecasting chain for the direct assessment of flash flood possible impacts on inhabited areas (number of buildings at risk in the presented case studies). The proposed approach includes, in addition to a distributed rainfall–runoff model, an automatic hydraulic method suited for the computation of flood extent maps on a dense river network and over large territories. The resulting catalogue of flood extent maps is then combined with land use data to build a flood impact curve for each considered river reach, i.e. the number of inundated buildings versus discharge. These curves are finally used to compute estimated impacts based on forecasted discharges. The approach has been extensively tested in the regions of Alès and Draguignan, located in the south of France, where well-documented major flash floods recently occurred. The article presents two types of validation results. First, the automatically computed flood extent maps and corresponding water levels are tested against rating curves at available river gauging stations as well as against local reference or observed flood extent maps. Second, a rich and comprehensive insurance claim database is used to evaluate the relevance of the estimated impacts for some recent major floods.
APA, Harvard, Vancouver, ISO, and other styles
20

Mkumbo, Neema J., Kassim R. Mussa, Eliapenda E. Mariki, and Ibrahimu C. Mjemah. "The Use of the DRASTIC-LU/LC Model for Assessing Groundwater Vulnerability to Nitrate Contamination in Morogoro Municipality, Tanzania." Earth 3, no. 4 (November 7, 2022): 1161–84. http://dx.doi.org/10.3390/earth3040067.

Full text
Abstract:
Groundwater is a useful source of water for various uses in different places. The major challenge in the use of this resource is how to manage and protect it from contamination. The current study was conducted in Morogoro Municipality to identify vulnerable groundwater areas by using DRASTIC-LU/LC model. The study applied eight input parameters, i.e., depth to water table, net recharge, aquifer media, soil media, topography, impact of vadose zone, hydraulic conductivity and land use/land cover patterns, which were overlaid in GIS to generate groundwater vulnerable map. The model used rating (R = 1–10) and weighting (W = 1–5) techniques to assess the effect of each parameter on groundwater contamination. The DRASTIC-LU/LC Vulnerability Index map was classified into low- (area = 29.2 km2), moderate- (area = 120.4 km2) and high-vulnerability zones (area = 124.4 km2). Nitrate analysis was conducted using the cadmium reduction method (DR 890) to assess the validity of the model and it was observed that 55%, 15% and 50% of the samples with unacceptable (>50 mg/L), high (29–50 mg/L) and moderate (14–28 mg/L) nitrate concentrations, respectively, fall into the high-vulnerability zone. Furthermore, 45%, 70% and 50% of the samples with unacceptable, high and moderate nitrate concentrations, respectively, fall into the moderate-vulnerability zone. In the low-vulnerability zone, only 15% of samples were found with a high nitrate concentration.
APA, Harvard, Vancouver, ISO, and other styles
21

Asadi, Haniyeh, Mohammad T. Dastorani, Roy C. Sidle, and Kaka Shahedi. "Improving Flow Discharge-Suspended Sediment Relations: Intelligent Algorithms versus Data Separation." Water 13, no. 24 (December 19, 2021): 3650. http://dx.doi.org/10.3390/w13243650.

Full text
Abstract:
Information on the transport of fluvial suspended sediment loads (SSL) is crucial due to its effects on water quality, pollutant transport and transformation, dam operations, and reservoir capacity. As such, adopting a reliable method to accurately estimate SSL is a key topic for watershed managers, hydrologists, river engineers, and hydraulic engineers. One of the most common methods for estimating SSL or suspended sediment concentrations (SSC) is sediment rating curve (SRC), which has several weaknesses. Here, we optimize the SRC equation using two main approaches. Firstly, three well recognized metaheuristic algorithms (genetic algorithm (GA), particle swarm optimization (PSO), and imperialist competitive algorithm (ICA)) were used together with two classical approaches (food and agriculture organization (FAO) and non-parametric smearing estimator (CF2)) to optimize the coefficients of the SRC regression model. The second approach uses separation of data based on season and flow discharge (Qw) characteristics. A support vector regression (SVR) model using only Qw as an input was employed for SSC estimation and the results were compared with the SRC and its optimized versions. Metaheuristic algorithms improved the performance of the SRC model and the PSO model outperformed the other algorithms. These results also indicate that the model performance was directly related to the temporal separation of data. Based on these findings, if data are more homogenous and related to the limited climatic conditions used in the estimation of SSC, the estimations are improved. Moreover, it was observed that optimizing SRC through metaheuristic models was much more effective than separating data in the SCR model. The results also indicated that with the same input data, SVR was superior to the SRC model and its optimized version.
APA, Harvard, Vancouver, ISO, and other styles
22

Gonzales, A. L., J. Nonner, J. Heijkers, and S. Uhlenbrook. "Comparison of different base flow separation methods in a lowland catchment." Hydrology and Earth System Sciences Discussions 6, no. 2 (April 27, 2009): 3483–515. http://dx.doi.org/10.5194/hessd-6-3483-2009.

Full text
Abstract:
Abstract. Assessment of water resources kept in different storages and moving along different pathways in a catchment is important for its optimal use and protection, and also for the prediction of floods and low flows. Moreover, understanding of the runoff generation processes is essential for assessing the impacts of climate and land use changes on the hydrological response of a catchment. Many methods for base flow separation exist, but hardly one focuses on the specific behaviour of temperate lowland areas. This paper presents the results of a base flow separation study carried out in a lowland area in the Netherlands. In this research, field observations of precipitation, groundwater and surface water levels and discharges, together with tracer analysis are used to understand the runoff generation processes in the catchment. Several tracer and non-tracer based base flow separation methods were applied to the discharge time series, and their results are compared. The results show that groundwater levels react fast to precipitation events in this lowland area with shallow groundwater tables. Moreover, a good correlation was found between groundwater levels and discharges meaning that most of the measured discharge also during floods comes from the groundwater storage. It was determined using tracer hydrological approaches that approximately 90% of the total discharge is groundwater displaced by event water infiltrating in the northern part of the catchment, and only the remaining 10% is surface runoff. The impact of remote recharge causing displacement of near channel groundwater during floods could also be motivated with hydraulic approximations. The results show further that when base flow separation is meant to separate groundwater contributions to stream flow, process based methods (e.g. rating curve method; Kliner and Knezek, 1974) are more reliable than other simple non-tracer based methods. Also, the recursive filtering method (proposed by Eckhardt, 2005) can be calibrated well using the results of tracer investigation, and this resulted in good results. Consequently, simple non-tracer based base flow separation methods that could be validated for some events may provide a powerful tool for groundwater assessment or model calibration/validation in lowland areas.
APA, Harvard, Vancouver, ISO, and other styles
23

Gonzales, A. L., J. Nonner, J. Heijkers, and S. Uhlenbrook. "Comparison of different base flow separation methods in a lowland catchment." Hydrology and Earth System Sciences 13, no. 11 (November 4, 2009): 2055–68. http://dx.doi.org/10.5194/hess-13-2055-2009.

Full text
Abstract:
Abstract. Assessment of water resources available in different storages and moving along different pathways in a catchment is important for its optimal use and protection, and also for the prediction of floods and low flows. Moreover, understanding of the runoff generation processes is essential for assessing the impacts of climate and land use changes on the hydrological response of a catchment. Many methods for base flow separation exist, but hardly one focuses on the specific behaviour of temperate lowland areas. This paper presents the results of a base flow separation study carried out in a lowland area in the Netherlands. In this study, field observations of precipitation, groundwater and surface water levels and discharges, together with tracer analysis are used to understand the runoff generation processes in the catchment. Several tracer and non-tracer based base flow separation methods were applied to the discharge time series, and their results are compared. The results show that groundwater levels react fast to precipitation events in this lowland area with shallow groundwater tables. Moreover, a good correlation was found between groundwater levels and discharges suggesting that most of the measured discharge also during floods comes from groundwater storage. It was estimated using tracer hydrological approaches that approximately 90% of the total discharge is groundwater displaced by event water mainly infiltrating in the northern part of the catchment, and only the remaining 10% is surface runoff. The impact of remote recharge causing displacement of near channel groundwater during floods could also be motivated with hydraulic approximations. The results show further that when base flow separation is meant to identify groundwater contributions to stream flow, process based methods (e.g. the rating curve method; Kliner and Knezek, 1974) are more reliable than other simple non-tracer based methods. Also, the recursive filtering method (proposed by Eckhardt, 2005) can be calibrated well using the results of tracer investigation giving good results. Consequently, non-tracer based base flow separation methods that can be validated for some events may provide a powerful tool for groundwater assessment or model calibration/validation in lowland areas.
APA, Harvard, Vancouver, ISO, and other styles
24

Kumar, Rakesh, Pramila Aggarwal, Ravendra Singh, Debashis Chakraborty, Ranjan Bhattacharya, R. N. Garg, Kalpana H. Kamble, and Brijesh Yadav. "Assessment of soil physical health and productivity of Kharkhoda and Gohana blocks of Sonipat district (Haryana), India." Journal of Applied and Natural Science 6, no. 1 (June 1, 2014): 6–11. http://dx.doi.org/10.31018/jans.v6i1.366.

Full text
Abstract:
In order to assess soil health of Kharkhoda and Gohana blocks of Sonipat district (a part of western Yamuna canal irrigated region), important parameters namely pH, electrical conductivity (EC), texture, bulk density (BD), saturated hydraulic conductivity (HC), soil organic carbon (OC), available water retension capacity (AWRC) and non capillary pores (NCP) were measured by collecting undisturbed soil samples in nearly 66 villages. Soil physical rating index (PI) method was used to compute PI which was an indicator of soil physical health of thatregion. Results revealed that in Gohana and Kharkhoda blocks, nearly 90% area had pH <8.0 and EC>4 dS m-1, which indicated that soils were saline. Prediction maps of soil BD showed that 75% of the total area in 15-30 cm soil layer had BD above >1.6 mg m-3, which indicated the presence of hard pan in subsurface. HC data of subsurface layer also showed that 60% of the area had values<0.5 cm hr-1 which reconfirmed the presence of hard pan. For both surface as well as subsurface soil layers, mostly AWC was >10% which indicated adequate water retention capacity of these soils. However 85% of subsurface had poor soil aeration capacity as indicated NCP range < 10 %. Prediction map of PI for subsurface layer showed that majority of area had PI<0.4 which indicated that expected yield of the crop cannot be more than 70% of the potential yield even under normal or higher levels of fertilizer and water inputs.
APA, Harvard, Vancouver, ISO, and other styles
25

Oke, Saheed Adeyinka. "Regional Aquifer Vulnerability and Pollution Sensitivity Analysis of Drastic Application to Dahomey Basin of Nigeria." International Journal of Environmental Research and Public Health 17, no. 7 (April 10, 2020): 2609. http://dx.doi.org/10.3390/ijerph17072609.

Full text
Abstract:
Shallow groundwater vulnerability mapping of the southwestern Nigeria sedimentary basin was assessed in this study with the aim of developing a regional-based vulnerability map for the area based on assessing the intrinsic ability of the aquifer overlying beds to filter and degrade migrating pollutant. The mapping includes using the established seven parameter-based DRASTIC vulnerability methodology. Furthermore, the developed vulnerability map was subjected to sensitivity analysis as a validation approach. This approach includes single-parameter sensitivity, map removal sensitivity, and DRASTIC parameter correlation analysis. Of the Dahomey Basin, 21% was classified as high-vulnerability and at risk of pollution, 61% as moderate vulnerability, and 18% as low vulnerability. Low vulnerability areas of the basin are characterised by thick vadose zones, low precipitation, compacted soils, high slopes, and high depth to groundwater. High-vulnerability areas which are prone to pollution are regions closer to the coast with flat slopes and frequent precipitation. Sensitivity of the vulnerability map show the greatest impact with the removal of topography, soil media, and depth to groundwater and least impact with the removal of the vadose zone. Due to the subjectivity of the DRASTIC method, the most important single parameter affecting the rating system of the Dahomey Basin DRASTIC map is the impact of the vadose zone, followed by the net recharge and hydraulic conductivity. The DRASTIC vulnerability map can be useful in planning and siting activities that generate pollutants (e.g., landfill, soak away, automobile workshops, and petrochemical industries) which pollute the environment, groundwater, and eventually impact the environmental health of the Dahomey Basin’s inhabitants.
APA, Harvard, Vancouver, ISO, and other styles
26

Ndomba, Preksedis M., and Joel Nobert. "Problems and Prospects of Hydraulic Modelling For Environmental Flows Assessment Studies in East Africa." Tanzania Journal of Engineering and Technology 34, no. 2 (December 31, 2013): 67–83. http://dx.doi.org/10.52339/tjet.v34i2.460.

Full text
Abstract:
The objective of this paper is to document the problems and prospects of hydraulic modelling for Environmental Flows Assessment (EFA) studies based on selected case studies. Most of studies in East Africa use Holistic methodologies. An ideal data set for defining river hydraulics for most of these methods would be six data points of stage measurements over a good distribution of discharges, the stage of zero discharge and some flood-related data. Besides, in East African region EFA studies suffer from data scarcity (i.e., poorly gauged sites) and limited expertise and funding. The hydraulics studies conducted by the authors entailed desktop research, limited fieldwork for data collection, data analysis, and modelling. The hydraulic models (HEC-RAS and PHABSIM) used are governed by Manning and/or Energy equation(s) to simulate hydraulics. The optimized sensitive parameters include roughness number, expansion/contraction coefficients,roughness modifier and Beta coefficient. Data collected at medium flow, bank full discharge information at neighbouring flow gauging stations, information from previous studies, field observations on flow regimes and professional experience validated the performance of these models. The geometric characteristics for extended floodplains and/or swamps were derived from a calibrated NASA Shuttle Radar Topographic Mission (SRTM) Digital Elevation Models (DEM) of 30 arc-seconds resolution under HEC-GeoRAS GIS extension Environment. The modelling results were considered satisfactory because the relative errors for most of applications fall below 20%. The good performance achieved is attributed to the instituted quality control measures right from suitable sites selection to hydraulic modelling phases. Modelling results confidence rating of above 3 in a scale of 1 to 5 achieved depended upon the hydraulic complexity. Based on the satisfactory results in the case studies, the authors would like to note that there are some prospects of carryingout hydraulic analysis in the regions with inadequate data. However, professional input is the key to successful modelling exercises. Therefore, follow research should use more data to verify the approach adopted.
APA, Harvard, Vancouver, ISO, and other styles
27

Chang, Frank. "Technology Focus: Acidizing (June 2021)." Journal of Petroleum Technology 73, no. 06 (June 1, 2021): 48. http://dx.doi.org/10.2118/0621-0048-jpt.

Full text
Abstract:
Hydraulic fracturing technologies propagated from North America outward to other oil- and gas-producing regions in the world. In earlier days, the main technology developments were mostly related to the materials, such as fluids and proppants, and their characterizations. In recent years, more advancements have been made in tools, engineering processes, and analyses. In a cased-hole fracturing treatment, perforating plays a critical role to the success of the job, though it is often overlooked because perforations are visualized as holes with empty tunnel behind the pipe. Any damage is irrelevant because fracturing will simply bypass the damage. In fact, a shaped charge is made of metal liner and case with explosive loaded in between. The metal material is pushed into the formation under extremely high pressure from the detonation of the explosive. Without backflow of reservoir fluid to flush out the debris, the perforation tunnels are very likely plugged. In tight formations, the backflow is not efficient because the permeability is too low and the time scale of the surge is very short. Obtaining information about perforation before pumping the fracture treatment allows the engineers to adjust the job design, adding perforations or other means to deliver a more-desirable outcome for the fracturing treatment. Not all the wells or zones are suitable for hydraulic fracturing. Concerns over the well completion rating, nearby water layers, equipment and water availability, and other environmental and infrastructure constraints can limit the selection of stimulation method. Matrix chemical injection has often been the preferred or sometimes the only option. More-advanced technologies, however, are needed to extend reservoir access beyond the distance of matrix stimulation. Mechanical tunneling tools have been developed in recent years. They can bridge the gap between matrix and fracturing treatment very well. When combined with chemicals, this process can add efficiency in certain carbonate reservoirs. Hydrochloric acid continues to be the most effective and low-cost material for carbonate stimulation. Though exotic chemistries such as chelating agents and organic acids have been promoted for being less corrosive at high temperatures, the cost and dissolving capacity limit their use to large-scale implementation. The ability to inhibit the corrosion tendency of hydrochloric acid can prove to be beneficial in the economics of acidizing. New technologies in corrosion prevention, both in acid stimulation and production processes, should always be beneficial. During the tough year of 2020, and for the foreseeable future, implementation of engineering ingenuity will become more critical to maintain economical energy delivery in our industry. Recommended additional reading at OnePetro: www.onepetro.org. SPE 202369 Novel High-Effective Component for Acidizing Corrosion Inhibitors: Indolizine Derivatives of the Quaternary Quinolinium Salts by Zhen Yang, China University of Petroleum, et al. SPE 203086 First Successful Fishbone Stimulation Completion in Onshore Oil Field in the United Arab Emirates by Fernando Quintero, ADNOC, et al.
APA, Harvard, Vancouver, ISO, and other styles
28

Samboko, Hubert T., Sten Schurer, Hubert H. G. Savenije, Hodson Makurira, Kawawa Banda, and Hessel Winsemius. "Towards affordable 3D physics-based river flow rating: application over the Luangwa River basin." Geoscientific Instrumentation, Methods and Data Systems 12, no. 2 (August 21, 2023): 155–69. http://dx.doi.org/10.5194/gi-12-155-2023.

Full text
Abstract:
Abstract. Uncrewed aerial vehicles (UAVs), affordable precise global navigation satellite system hardware, multi-beam echo sounders, open-source 3D hydrodynamic modelling software, and freely available satellite data have opened up opportunities for a robust, affordable, physics-based approach to monitoring river flows. Traditional methods of river discharge estimation are based on point measurements, and heterogeneity of the river geometry is not contemplated. In contrast, a UAV-based system which makes use of geotagged images captured and merged through photogrammetry in order to generate a high-resolution digital elevation model (DEM) provides an alternative. This UAV system can capture the spatial variability in the channel shape for the purposes of input to a hydraulic model and hence probably a more accurate flow discharge. In short, the system can be used to produce the river geometry at greater resolution so as to improve the accuracy in discharge estimations. Three-dimensional hydrodynamic modelling offers a framework to establish relationships between river flow and state variables such as width and depth, while satellite images with surface water detection methods or altimetry records can be used to operationally monitor flows through the established rating curve. Uncertainties in the data acquisition may propagate into uncertainties in the relationships found between discharge and state variables. Variations in acquired geometry emanate from the different ground control point (GCP) densities and distributions used during photogrammetry-based terrain reconstruction. In this study, we develop a rating curve using affordable data collection methods and basic principles of physics. The basic principal involves merging a photogrammetry-based dry bathymetry and wet bathymetry measured using an acoustic Doppler current profiler (ADCP). The output is a seamless bathymetry which is fed into the hydraulic model so as to estimate discharge. The impact of uncertainties in the geometry on discharge estimation is investigated. The impact of uncertainties in satellite observation of depth and width is also analysed. The study shows comparable results between the 3D and traditional river rating discharge estimations. The rating curve derived on the basis of 3D hydraulic modelling was within a 95 % confidence interval of the traditional gauging-based rating curve. The 3D-hydraulic-model-based estimation requires determination of the roughness coefficient within the stable bed and the floodplain using field observation at the end of both the dry and wet season. Furthermore, the study demonstrates that variations in the density of GCPs beyond an optimal number have no significant influence on the resultant rating relationships. Finally, the study observes that which state variable approximation (water level and river width) is more accurate depends on the magnitude of the flow. Combining stage-appropriate proxies (water level when the floodplain is entirely filled and width when the floodplain is filling) in data-limited environments yields more accurate discharge estimations. The study was able to successfully apply advanced UAV and real-time kinematic positioning (RTK) technologies for accurate river monitoring through hydraulic modelling. This system may not be cheaper than in situ monitoring; however, it is notably more affordable than other systems such as crewed aircraft with lidar. In this study the calibration of the hydraulic model is based on surface velocity and the water depth. The validation is based on visual inspection of an RTK-based waterline. In future studies, a larger number of in situ gauge readings may be considered so as to optimize the validation process.
APA, Harvard, Vancouver, ISO, and other styles
29

Cortes Arevalo, V. J., M. Charrière, G. Bossi, S. Frigerio, L. Schenato, T. Bogaard, C. Bianchizza, A. Pasuto, and S. Sterlacchini. "Evaluating data quality collected by volunteers for first-level inspection of hydraulic structures in mountain catchments." Natural Hazards and Earth System Sciences 14, no. 10 (October 6, 2014): 2681–98. http://dx.doi.org/10.5194/nhess-14-2681-2014.

Full text
Abstract:
Abstract. Volunteers have been trained to perform first-level inspections of hydraulic structures within campaigns promoted by civil protection of Friuli Venezia Giulia (Italy). Two inspection forms and a learning session were prepared to standardize data collection on the functional status of bridges and check dams. In all, 11 technicians and 25 volunteers inspected a maximum of six structures in Pontebba, a mountain community within the Fella Basin. Volunteers included civil-protection volunteers, geosciences and social sciences students. Some participants carried out the inspection without attending the learning session. Thus, we used the mode of technicians in the learning group to distinguish accuracy levels between volunteers and technicians. Data quality was assessed by their accuracy, precision and completeness. We assigned ordinal scores to the rating scales in order to get an indication of the structure status. We also considered performance and feedback of participants to identify corrective actions in survey procedures. Results showed that volunteers could perform comparably to technicians, but only with a given range in precision. However, a completeness ratio (question/parameter) was still needed any time volunteers used unspecified options. Then, volunteers' ratings could be considered as preliminary assessments without replacing other procedures. Future research should consider advantages of mobile applications for data-collection methods.
APA, Harvard, Vancouver, ISO, and other styles
30

Shiau, Jenq-Tzong, and Yu-Cheng Lien. "Copula-Based Infilling Methods for Daily Suspended Sediment Loads." Water 13, no. 12 (June 19, 2021): 1701. http://dx.doi.org/10.3390/w13121701.

Full text
Abstract:
Less-frequent and inadequate sampling of sediment data has negatively impacted the long and continuous records required for the design and operation of hydraulic facilities. This data-scarcity problem is often found in most river basins of Taiwan. This study aims to propose a parsimonious probabilistic model based on copulas to infill daily suspended sediment loads using streamflow discharge. A copula-based bivariate distribution model of sediment and discharge of the paired recorded data is constructed first. The conditional distribution of sediment load given observed discharge is used to provide probabilistic estimation of sediment loads. In addition, four different methods based on the derived conditional distribution of sediment load are used to give single-value estimations. The obtained outcomes of these methods associated with the results of the traditional sediment rating curve are compared with recorded data and evaluated in terms of root mean square error (RMSE), mean absolute percentage error (MAPE), Nash-Sutcliffe efficiency (NSE), and modified Nash-Sutcliffe efficiency (MNSE). The proposed approach is applied to the Janshou station located in eastern Taiwan with recorded daily data for the period of 1960–2019. The results indicate that the infilled sediments by the sediment rating curve exhibit better performance in RMSE and NSE, while the copula-based methods outperform in MAPE and MNSE. Additionally, the infilled sediments by the copula-based methods preserve scattered characteristics of observed sediment-discharge relationships and exhibit similar frequency distributions to that of recorded sediment data.
APA, Harvard, Vancouver, ISO, and other styles
31

Huster, R., and C. H. Möbius. "Control of Activated Sludge Circulation and of Secondary Settling Tank Hydraulics." Water Science and Technology 20, no. 1 (January 1, 1988): 287–90. http://dx.doi.org/10.2166/wst.1988.0037.

Full text
Abstract:
The directives issued by the German Waste Water Association (ABWASSERTECHNISCHE VEREINIGUNG (ATV)) and by the British WATER RESEARCH CENTRE (WRC) in respect of the rating and control of activated sludge circuits and of the loading of secondary settling tanks of biological waste water treatment plants were studied for their applicability to papermill effluents. To this end, several years' testing was carried out on an activated sludge pilot plant and on various industrial plants. These tests revealed that secondary settling tanks of papermill effluent treatment plants may safely be rated in accordance with ATV up to a sludge volume index (SVI) of 300 ml/g and a sludge return rate of 3. If SVI values are low, the WRC process permits excessive surface loadings and is thus only practicable for high SVI levels. If sedimentation properties of the activated sludge are poor, load capacity limits are indicated more correctly by the WRC method. A simplified settling velocity method derived from the WRC process gives reliable information on the load capacity of secondary settling tanks and may readily be used for sludge circulation control.
APA, Harvard, Vancouver, ISO, and other styles
32

Nurroh, Syampadzi, Totok Gunawan, and Andri Kurniawan. "Assessment of groundwater pollution risk potential using DRASTIC Model in Yogyakarta City, Indonesia." E3S Web of Conferences 200 (2020): 02002. http://dx.doi.org/10.1051/e3sconf/202020002002.

Full text
Abstract:
Assessment of groundwater pollution risk is purposed to be of particular value for environmental management programs development, this research estimated and calculated of groundwater pollution risk potential in Yogyakarta City using DRASTIC Model, DRASTIC parameters developed as Depth to water (D), net Recharge (R), Aquifer media (A), Soil media (S), Topography (T), Impact of vadose zone (I), and Hydraulic conductivity (C), the weights and ratings assigned in this research were similar to the typical ratings suggested in the original Methode. The result final assessment that groundwater pollution risk potential are classifies 4, 27% of the area as having very low, 15, 12% of the area as having low, 20, 17 % as having moderate, 43, 10% as having high, and 17, 34% as having very high. The model was validated using E. Coli parameters as a represent of pollution risk where the results having exceeds 85% of total samples that a value exceeds from the standard of quality > 0 MPN/100 ml. However, this research is a preliminary to be continued in the further research.
APA, Harvard, Vancouver, ISO, and other styles
33

Üneş, Fatih, Bestami Taşar, Mustafa Demirci, Martina Zelenakova, Yunus Ziya Kaya, and Hakan Varçin. "Daily Suspended Sediment Prediction Using Seasonal Time Series and Artificial Intelligence Techniques." Rocznik Ochrona Środowiska 23 (2021): 117–37. http://dx.doi.org/10.54740/ros.2021.008.

Full text
Abstract:
Estimating the amount of suspended sediment in rivers correctly is important due to the adverse impacts encountered during the design and maintenance of hydraulic structures such as dams, regulators, water channels and bridges. The sediment concentration and discharge currents have usually complex relationship, especially on long term scales, which can lead to high uncertainties in load estimates for certain components. In this paper, with several data-driven methods, including two types of perceptron support vector machines with radial basis function kernel (SVM-RBF), and poly kernel learning algorithms (SVM-PK), Library SVM (LibSVM), adaptive neuro-fuzzy (NF) and statistical approaches such as sediment rating curves (SRC), multi linear regression (MLR) are used for forecasting daily suspended sediment concentration from daily temperature of water and streamflow in the river. Daily data are measured at Augusta station by the US Geological Survey. 15 different input combinations (1 to 15) were used for SVM-PK, SVM-RBF, LibSVM, NF and MLR model studies. All approaches are compared to each other according to three statistical criteria; mean absolute errors (MAE), root mean square errors (RMSE) and correlation coefficient (R). Of the applied linear and nonlinear methods, LibSVM and NF have good results, but LibSVM generates a slightly better fit under whole daily sediment values.
APA, Harvard, Vancouver, ISO, and other styles
34

Jurisch, Tim, Stefan Cantré, and Fokke Saathoff. "Inverse Infiltration Modeling of Dike Covers Made of Dredged Material Using PEST and AMALGAM." Geosciences 11, no. 2 (January 21, 2021): 41. http://dx.doi.org/10.3390/geosciences11020041.

Full text
Abstract:
A variety of studies recently proved the applicability of different dried, fine-grained dredged materials as replacement material for erosion-resistant sea dike covers. In Rostock, Germany, a large-scale field experiment was conducted, in which different dredged materials were tested with regard to installation technology, stability, turf development, infiltration, and erosion resistance. The infiltration experiments to study the development of a seepage line in the dike body showed unexpected measurement results. Due to the high complexity of the problem, standard geo-hydraulic models proved to be unable to analyze these results. Therefore, different methods of inverse infiltration modeling were applied, such as the parameter estimation tool (PEST) and the AMALGAM algorithm. In the paper, the two approaches are compared and discussed. A sensitivity analysis proved the presumption of a non-linear model behavior for the infiltration problem and the Eigenvalue ratio indicates that the dike infiltration is an ill-posed problem. Although this complicates the inverse modeling (e.g., termination in local minima), parameter sets close to an optimum were found with both the PEST and the AMALGAM algorithms. Together with the field measurement data, this information supports the rating of the effective material properties of the applied dredged materials used as dike cover material.
APA, Harvard, Vancouver, ISO, and other styles
35

Kikomeko, Samuel, and Jotham Sempewo. "Development of optimal pump schedules for improved energy efficiency in water supply systems (case of NWSC)." International Journal of Biological and Chemical Sciences 15, no. 7 (April 22, 2022): 23–34. http://dx.doi.org/10.4314/ijbcs.v15i7.3s.

Full text
Abstract:
The water utility in Uganda (NWSC) was under pressure from regulators, environmentalists and board members to reduce energy costs. However, achieving energy efficiency in the water distribution systems of Kampala that is characterized by variable demands and prescribed pressures would be impossible if this utility continued operating on trial and error methods. This research was undertaken in the year 2016-2017 and aimed at exploring how pump schedule optimization could enable NWSC to deal with the challenge of high energy costs and improve water utility performance. In this research, the energy consumption of existing pumps was obtained from historical data, data was diagnosed and based on the diagnostic findings, decision variables were selected and optimal pump schedules were formulated. The formulated schedules were applied to the Gabba Muyenga supply system of National Water and Sewerage Company (Uganda) as a proof of concept. The formulated pump schedules when applied on different pumps classified as models 1, 2 and 3 based on pump flow ratings and motor voltage ratings, results show that scheduling pump operations based on time of the day tariffs enabled NWSC to save about 0.373 Million kWh annually. On the other hand pump scheduling based on pressure, modulation had the potential to reduce water losses enabling NWSC to save 12 m3/hr equivalent to 0.068 million kWh per year in energy terms without compromising customer service levels and this was only for the established DMA within the case study area and not for the entire NWSC water distribution network. The data presented were obtained through field measurements, statistical analysis and hydraulic design calculations
APA, Harvard, Vancouver, ISO, and other styles
36

Kikomeko, Samuel, and Jotham Sempewo. "Development of optimal pump schedules for improved energy efficiency in water supply systems (case of NWSC)." International Journal of Biological and Chemical Sciences 15, no. 7 (April 22, 2022): 23–34. http://dx.doi.org/10.4314/ijbcs.v15i7.3s.

Full text
Abstract:
The water utility in Uganda (NWSC) was under pressure from regulators, environmentalists and board members to reduce energy costs. However, achieving energy efficiency in the water distribution systems of Kampala that is characterized by variable demands and prescribed pressures would be impossible if this utility continued operating on trial and error methods. This research was undertaken in the year 2016-2017 and aimed at exploring how pump schedule optimization could enable NWSC to deal with the challenge of high energy costs and improve water utility performance. In this research, the energy consumption of existing pumps was obtained from historical data, data was diagnosed and based on the diagnostic findings, decision variables were selected and optimal pump schedules were formulated. The formulated schedules were applied to the Gabba Muyenga supply system of National Water and Sewerage Company (Uganda) as a proof of concept. The formulated pump schedules when applied on different pumps classified as models 1, 2 and 3 based on pump flow ratings and motor voltage ratings, results show that scheduling pump operations based on time of the day tariffs enabled NWSC to save about 0.373 Million kWh annually. On the other hand pump scheduling based on pressure, modulation had the potential to reduce water losses enabling NWSC to save 12 m3/hr equivalent to 0.068 million kWh per year in energy terms without compromising customer service levels and this was only for the established DMA within the case study area and not for the entire NWSC water distribution network. The data presented were obtained through field measurements, statistical analysis and hydraulic design calculations
APA, Harvard, Vancouver, ISO, and other styles
37

Lee, Dongyeop, Jonghoon Park, Hyun A. Lee, and Nam C. Woo. "A Numerical Approach to Evaluating Groundwater Vulnerability to Seawater Intrusion on Jeju Volcanic Island, South Korea." Sustainability 15, no. 4 (February 8, 2023): 3081. http://dx.doi.org/10.3390/su15043081.

Full text
Abstract:
Seawater intrusion (SWI) is a critical issue for coastal aquifers, especially in islands where groundwater is the sole source of water supply. The objective of this study was to develop a straightforward approach to evaluating groundwater vulnerability to SWI, using a statistical method with spatial analyses applied to the four basins of Jeju volcanic island. In this study, five factors were parametrized, including hydraulic conductivity, groundwater level, distance from shoreline to wells, well depth and groundwater use. These parameters were spatially interpolated and correlated with groundwater electrical conductivity as a proxy for groundwater salinization, resulting in three parameters with significant relations: groundwater use, well depth, and groundwater level. Then, a numerical model for the SWI vulnerability assessment was constructed using ratings and weights, and by evaluating the vulnerability as weak, moderate and high with a numerical index. Regional conditions, including major land-use types, industrial activities, population and the degree of urbanisation, could affect parameters differently at each region. Based on the percentage of area with a high vulnerability, regions of Jeju Island followed the order of eastern > northern > western > southern, indicating that preventive measures for SWI and its influencing parameters could be applied more effectively in certain regions.
APA, Harvard, Vancouver, ISO, and other styles
38

Zhai, Xin Xian, Yan Wei Zhai, and Shi Wei Zhang. "Study on Strata Behaviors of the Coal Face with Sublevel Caving in Hugely-Thick Coal Seam in Qianqiu Coal Mine." Advanced Materials Research 671-674 (March 2013): 1150–55. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.1150.

Full text
Abstract:
Qianqiu Coal Mine, Yima Coal Group Company Limited, China, has been mining the gently-inclined and hugely-thick coal seam #2-3. The overburden above the coal seam has hugely-thick conglomerate strata with more than 400m thickness, which has significant effects on the strata behaviors of the coal face with sublevel caving. Therefore, study on strata behaviors has an important practical significance to surrounding rocks control and safety production at the coal face. Using theoretical analysis and field observation methods, the following conclusions can be drawn: (1) the surrounding rocks of the coal face with sublevel caving belongs to difficult control one, i.e., it is the surrounding rocks control of roof and floor at the coal face that is difficult. At last, hydraulic supports with sublevel caving of pattern ZF7000-18/28 and their reasonable matching equipment were chosen. (2) The law of strata behaviors of the coal face was observed. Strata behaviors of the coal face were significant and inconsistent at different coal face zones. The parameters of roof weighting interval and roof weighting strength at the coal face were obtained. The maximum value of supporting resistance during periodical weighting was 4307.70kN, being 61.54% of supports rating resistance. Therefore, the supports at the coal face had a higher reliability. Mine production-model with one-mine and one-face can be realized, which promotes the construction of a modernization mine with high production and high efficiency.
APA, Harvard, Vancouver, ISO, and other styles
39

Canora, Filomena, Rosalba Muzzillo, and Francesco Sdao. "Groundwater Vulnerability Assessment in the Metaponto Coastal Plain (Basilicata, Italy)." Water 14, no. 12 (June 9, 2022): 1851. http://dx.doi.org/10.3390/w14121851.

Full text
Abstract:
This study aims at a groundwater vulnerability assessment of the Metaponto coastal plain, located in the Basilicata region (southern Italy). In the last century, intensive agriculture, zootechnical and industrial activities have significantly changed the plain. These changes led to negative impacts on the hydrogeological system intensifying the risk of the aquifer to pollution. The paper presents the assessment of the intrinsic vulnerability of the coastal aquifer carried out by the GIS-based application of the SINTACS method. It considers several aquifer parameters such as water table depth, effective infiltration, unsaturated conditions, soil media, aquifer media, hydraulic conductivity and topography. Furthermore, the anthropogenic influence in the study area was considered by applying the SINTACS-LU method, in which the parameter of land use (LU) was added. The SINTACS and SINTACS-LU vulnerability indexes were provided by summing the product of ratings and weights assigned to each parameter. The analysis of the intrinsic vulnerability map allowed for determining three classes ranging from low to high vulnerability. In both cases, the southeastern part of the coastal plain, closest to the sea, shows the highest vulnerability class, indicating that it is the most vulnerable to contamination due to the hydrogeological intrinsic factors. The wide central part of the study area shows a moderate class of vulnerability and the low class is scattered in small parts in the northern portion of the plain, which represents the areas less contaminable in space and time in the case of potential pollution. In the SINTACS-LU map, some areas classified as highly vulnerable in the SINTACS method show a minor vulnerability class. These areas are localized in natural and wooded sectors of the Metaponto plain, which are less populated, where human impact on the groundwater is minimal.
APA, Harvard, Vancouver, ISO, and other styles
40

Zhalkin, Denis, Sergij Zhalkin, Valentin Vinichenko, and Sergij Skripchenko. "REMOVAL OF DIESEL OIL WATER BY HYDRODYNAMIC DISPERSION." Collected scientific works of Ukrainian State University of Railway Transport, no. 199 (June 10, 2022): 78–88. http://dx.doi.org/10.18664/1994-7852.199.2022.258810.

Full text
Abstract:
Water, sulfur and lead compounds can enter the oil from the combustion chamber ofa running diesel engine. Significant amounts of diesel oil are missing due to water or vapor in thewater system and exhaust gases, which creates emulsion and sediment (sludge) at relatively lowtemperatures and disrupts the lubrication and cooling of friction surfaces and increases wear ofengine parts. Such oil must be drained from the crankcase and regenerated.The most promising method of regeneration of rejected oil, including in the locomotive depot,is hydrodynamic dispersion, which allows to remove water and modify the aging products instead ofa complex process of coagulation or evaporation.The article considers the reason for heating oil during its hydrodynamic dispersion, based onthe probable assumption that heating is due to viscous (internal) friction of oil in the hydrodispersantand hydroelements that ensure its operation.During operation, the oil used in diesel internal combustion engines is a complex mixture ofcarbohydrates and additive components, has certain physicochemical and operational properties.The oil system of the running engine provides greasing and cooling of friction surfaces and is exposed to complex influence of high temperature, oxygen of air, fuel and products of wear of details of theengine and foreign impurity (dust, fuel, water), ie difficult physical and chemical processes occur.aging of oil ".The article considers the reasons for the violation of the oil properties of diesel locomotivesdue to the modes of operation of diesel engines and the ingress of water orits vaporinto the crankcasedue to leaks in the cooling system and exhaust gases. When water enters the oil, an emulsion isformed, which leads to the deterioration of the oil layer between the parts in the friction pairs andincreased wear of the crankshaft bearings with babbit filling fillings and other parts.The presence of water in the oil contributes to its interaction with additives and theirprecipitation, creating an oily sticky mass, which can lead to partial or complete cessation of oilsupply to friction surfaces, reducing the cooling capacity of refrigerated sections of locomotives andheat exchangers. Diesel oil, which has defective performance, is subject to replacement or high-costregeneration, ie the restoration of the original properties in order to reuse it. Regeneration is oneway to save oil.The following sequence of methods must be followed in the complex of technologicalprocesses of regeneration: mechanical – to remove free water and solid contaminants from oil,thermophysical – to evaporate fuel and water residues, as well as physicochemical – coagulation,adsorption. One of the following schemes is used: sludge – treatment with surfactants – fueldistillation – treatment with adsorbent – filtration.The application of these methods requires complex, expensive equipment with high energyconsumption, and this in a locomotive depot (or regional center), as a rule, is not economicallyfeasible.Water and fuel are removed in two stages: evaporation (water and fuel) and adsorption (water).Evaporation of spent oils is performed by heating without pressure or using vacuum without pressureor using vacuum with heating the oil to a temperature of 70-80 °C. This method of restoring theproperties of the oil, although it leads to positive results, but causes significant energy consumption.The most promising method of waste waste treatment is hydrodynamic dispersion, which allowsaging products to be modified instead of a complex coagulation process. In addition, water and fuelare removed from the oil during dispersion as a result of heating.This method can be used in locomotive depots in the regeneration of motor (diesel) oils, whichhave defective parameters for certain indicators.The most expedient is the use of hydrodynamic dispersant (HD) in volumetric hydraulic drivesand internal combustion engines, which with relatively simple design and manufacturability does notcause destruction of oil hydrocarbon molecules, does not require preparation and adjustment beforeoperation, its efficiency in pressure fluctuations decreases. GD is energy efficient, does not causedifficulties when built-in, its durability is higher than ultrasonic and cavitating dispersants.But for the application of GD it is necessary to determine its parameters and regenerationtemperature.The article considers the reason for heating oil during its hydrodynamic dispersion, based onthe probable assumption that heating is due to viscous (internal) friction of oil in the hydrodispersantand hydroelements that ensure its operation.At the same time, we accept the assumption that the oil pressure before the GD and its flow ratein the hydroelements is constant. It was found that the temperature of the oil when dispersed isproportional to its dynamic viscosity, the square of the velocity of the oil and inversely proportionalto the heat transfer coefficient and the radius of the tube, which agrees well with the proposedhypothesis that the cause of oil heating in hydrodynamic dispersion is viscous friction (equation 17),and the oil is heated from 70 ° C to 100 ° C depending on the pressure. The results of experimental studies have shown that the optimal mode of treatment of wateredoil with GD is a pressure of 0.5 MPa at the number of cycles N = 50 and a temperature of 130-135 °C, which is much lower than the flash point of the oil.
APA, Harvard, Vancouver, ISO, and other styles
41

Gonçalves, George Marino Soares, Guilherme Kruger Bartels, Luciana Shigihara Lima, Lukas dos Santos Boeira, and Gilberto Loguercio Collares. "Continuous discharge monitoring of the Mirim-São Gonçalo system by the index velocity rating curve method." Journal of Hydroinformatics, January 10, 2023. http://dx.doi.org/10.2166/hydro.2023.045.

Full text
Abstract:
Abstract The São Gonçalo Channel, located in the south of Brazil, is responsible for connecting the Mirim Lagoon to the Patos Lagoon, constituting the largest coastal lagoon system in Latin America. The assessment of its hydraulic variables is necessary given the importance of this channel for the region. Thus, this study aimed to evaluate the performance of the index velocity rating curve (IVRC) method, from velocity measurements provided by horizontal static-type acoustic Doppler profilers (H-ADCPs). For the two sections analyzed in this study (GS1 and GS2), IVRC models were developed considering the integrated velocity cell (IVC) method; the multi-cell velocity (MCV) method; the joint use of IVC and MCV; and a stage-mean velocity rating curve. The results point to an r2 of 0.986 (IVC), 0.998 (IVC + MCV), 0.534 (stage-mean velocity) at GS1, and r2 of 0.986 (IVC), 0.995 (IVC + MCV), and 0.815 (stage-mean velocity) at GS2. In both GS1 and GS2, results showed significant gains – for different flow conditions – on continuous estimations of flow velocities and discharges when considering the MCV + IVC method. The IVRC model that presented the best fit allowed the development of a time-series of discharges in the studied sites with high reliability.
APA, Harvard, Vancouver, ISO, and other styles
42

Hofmeister, Florentin, Brenda Rubens Venegas, Gabriel Sentlinger, Michael Tarantik, Theresa Blume, Markus Disse, and Gabriele Chiogna. "Automated streamflow measurements in high‐elevation Alpine catchments." River Research and Applications, August 21, 2023. http://dx.doi.org/10.1002/rra.4203.

Full text
Abstract:
AbstractSalt dilution is a well‐established streamflow measurement method in creeks, which works particularly well downstream of turbulent flow sections as the mixing of the salt tracer is enhanced. Usually, salt dilution measurements are performed manually, which considerably limits the observations of rare peak flow events. These events are particularly important for constructing robust rating curves and avoiding large uncertainties in the extrapolation of streamflow values. An additional challenge is the variability of the river cross section, especially after larger discharge events, leading to nonstationary rating curves. Therefore, discharge measurements well distributed over time are needed to construct a reliable streamflow–water level relationship and to detect changes caused by erosion and deposition processes. To overcome these two issues, we used an automated streamflow measuring systems at three different sites with contrasting hydrological and hydraulic characteristics in the Alps. This system allowed us to measure discharge at nearly maximum flow of the observation period (2020–2021) at all three sites and to detect abrupt changes in the rating curve by performing event‐based salt injections. The uncertainty in the measurements was quantified, and the streamflow was compared with official gauging stations in the same catchment. Based on a very large dataset of almost 300 measurements, we were able to evaluate the reliability of the system and identify the primary sources of uncertainty in the experimental setup. One key aspect was the site selection for the downstream electrical conductivity sensors, as measurement location strongly controls the signal‐to‐noise ratio in the recorded breakthrough curves.
APA, Harvard, Vancouver, ISO, and other styles
43

Duc Hanh, Nguyen, Nguyen Tien Giang, Dang Tran Duc Minh, Dao Ba Huy, Le Huu Minh Quan, and Nguyen Thi Tinh. "Modelling Stage-discharge Relationships for Hydrological Stations in the Da River Basin using First-kind Chebyshev Polynomial Approximation." VNU Journal of Science: Earth and Environmental Sciences 39, no. 2 (June 21, 2023). http://dx.doi.org/10.25073/2588-1094/vnuees.4956.

Full text
Abstract:
Observed discharge time series is essential data for hydrological analysis, streamflow forecasting, as well as water resources planning and management. Estimation of continuous discharge time series is generally based on the curves (or empirical models) that can properly simulate the relationships between water levels (stages) and concurrent water discharges observed at a particular hydrological station. For stations with complex hydraulic conditions, in addition to gauged stages at the discharge gauging section, another variable such as stage measured at an auxiliary station (to calculate the slope) or rate of change in stage is added to the estimation process. This paper presents the results of applying the first-kind Chebyshev polynomial approximation method in constructing rating curves for three hydrological stations in the Da river basin, each having different basin characteristics and various influencing factors. The analysis results using five evaluation indices (MAE, σ, Pbias, KGE, and MAPE) show that the Chebyshev polynomials are highly effective in modelling both simple and complex stage-discharge relationships. The Chebyshev polynomial approximation method is suggested to be used for establishing stage-discharge relationships in hydrometry.
APA, Harvard, Vancouver, ISO, and other styles
44

Damte, Fikru, Bogale G_Mariam, Melkamu Teshome Ayana, Tarun Kumar Lohani, Gaurav Dhiman, and Mohammad Shabaz. "Computing the sediment and ensuing its erosive activities using HEC-RAS to surmise the flooding in Kulfo River in Southern Ethiopia." World Journal of Engineering ahead-of-print, ahead-of-print (May 10, 2021). http://dx.doi.org/10.1108/wje-01-2021-0002.

Full text
Abstract:
Purpose The change in sediment transport phenomenon and morphological characteristics of Kulfo River in the southern part of Ethiopia is estimated using one-dimensional hydraulic modelling. The purpose of this study is to predict erosion and sedimentation using hydrological engineering center-river analysis system (HEC-RAS) model. Design/methodology/approach Geometrical survey data of 2005 and 2019 were used to assess the impact of flood depth with 100 years of return per period on the morphology of the river. The bed and bank materials at selected sites of the river were sampled to estimate the grain size using manning roughness coefficient. Discharge and suspended sediment concentration were sampled thrice per day for a stretch of three months to develop a rating curve. Findings HEC-RAS model indicates that flood depth with 100 years return period had a significant inundated area during 2019 in comparison to 2005 demonstrating a temporary change in the morphology of the river. Acker and White method in HEC-RAS was used extensively to calculate the sediment load and subsequently calibrated. In the upper reach of the study area, there was aggradation and degradation, whereas the only degradation was noted in the middle to the downstream reach of the channel. Seasonal flood during peak flow due to a rise in bed level is most prevalent during the aggradation period. Originality/value Comparison of a flood depth inundating the catchment and sediment deposition has been intricately analyzed by using HEC-RAS model.
APA, Harvard, Vancouver, ISO, and other styles
45

Akingboye, Adedibu. "Geohydraulic characteristics and groundwater vulnerability assessment of tropically weathered and fractured gneissic aquifers using combined georesistivity and geostatistical methods." Journal of the Nigerian Society of Physical Sciences, November 19, 2022, 497. http://dx.doi.org/10.46481/jnsps.2022.497.

Full text
Abstract:
Sustainable groundwater yield in aquifers depends on the protective capacity of the subsurface lithologies and conduit systems. Electrical resistivity tomography (ERT) and its Schlumberger vertical electrical sounding (VES) technique were employed to assess the groundwater yield of aquifer units and their vulnerability to contaminants in Araromi (Akungba-Akoko), southwestern Nigeria. Geohydraulic parameters: aquifer resistivity (\rho0), hydraulic conductivity (K), transmissivity (T), permeability (\Psi), hydraulic resistance (KR), and longitudinal conductance (S) were also evaluated. In addition, regression analysis was utilized to establish the empirical relationships between the K and other geohydraulic parameters, with their percentage contributions to posing vulnerability risk. The georesistivity results revealed four distinct layers: topsoil, weathered layer, partially weathered/fractured bedrock unit, and fresh bedrock. The K model regression-assisted analysis showed that the \rho, T, \Psi, and S contributed about 97.8%, 14%, 99.9%, and 11.5%, respectively, to the estimated aquifers’ K values for the study area. Except for T and S, the regression results had moderate to strong positive correlations with K; hence, this illuminates the essentiality of K in assessing groundwater potential and vulnerability. The aquifer units have low to moderate groundwater yield based on T values (1.67-17.57 m/day) caused by the generally thin overburden (<4 m). However, the deep-weathered and fractured aquifer units with depths ranging from 39-55 m could supply high groundwater yield for sustainable abstraction. The estimated S values (0.0226-0.1926 mhos) for aquifer protective capacity ratings rated the aquifer units in the area as poor to weak. Based on the estimated low logarithm of KR (log KR) values of 0.79-2.25 years, these aquifers have extremely high to moderate aquifer vulnerability index. As a result, prospective wells/boreholes in the study area and settings with similar geohydraulic and vulnerability characteristics should be developed adequately to prevent the infiltration of surface contaminants for potable groundwater abstraction.
APA, Harvard, Vancouver, ISO, and other styles
46

Kalantar Hormozi, Mohammad Javad, Akbar Ghazifard, and Zeinab Jorkesh. "Determining the appropriate sealing conditions through a permeability and groutability evaluation: a case study of the Sivaki Dam, Iran." Quarterly Journal of Engineering Geology and Hydrogeology, June 24, 2021, qjegh2020–124. http://dx.doi.org/10.1144/qjegh2020-124.

Full text
Abstract:
The Sivaki Dam is an earth dam that is located near Yasuj city, 5.3 km NW of Sepidar village. During excavations at the dam construction site, the high potential of water seepage from the foundation and its abutments has been proven. Some cavities and dissolution have been observed on both sides of the dam, suggesting the possibility of karstification at greater depths. Most of the rocks cropping out in the study area comprise Asmari Limestone. These rock masses, despite their medium–high strength, have provided unfavourable conditions in terms of permeability and weathering. In this study, the foundation and both abutments of the dam were evaluated and analysed to determine the permeability and groutability characteristics. To achieve this goal, the engineering characteristics of the rock mass of the construction site were examined by performing rock mass rating (RMR) and geological strength index (GSI) classifications. The Lugeon test, secondary permeability index (SPI), rock quality designation (RQD) and monitoring hydraulic flows were used for this purpose. According to the results of this study, for abutments of the dam and in the case of alluvial substrates, a grout curtain and cutoff wall, respectively, are the best and most compatible methods available.
APA, Harvard, Vancouver, ISO, and other styles
47

Onwe, Mkpuma Rock, G. I. Nwankwor, C. A. Ahiarakwem, Ema Michael Abraham, and T. T. Emberga. "Assessment of geospatial capability index for siting waste dump/landfill to control groundwater geopollution using geographic information system (GIS) approach: case study of Abakaliki area and environs, Southeastern Nigeria." Applied Water Science 10, no. 1 (November 22, 2019). http://dx.doi.org/10.1007/s13201-019-1087-5.

Full text
Abstract:
AbstractUnderstanding spatial variation of rock and soil is important for capability precision as well as groundwater contamination or geopollution management. In view of waste dump/landfills, geoenvironmental hazards ravaging our land including surface and groundwater contamination, site suitability indexing, spatial distribution and characteristics of underlying rock and soil matter are studied. Rock and soil samples were collected in a systematic grid pattern using simple drill core rig and hand auger. Geostatistical and soil property analyses were conducted on each grid. Groundwater aquifer vulnerability to leachate was studied using depth to water table, recharge (precipitation), aquifer material, topographic slope, impact on vadose zone/vadose zone material and hydraulic conductivity (DRASTIC) and geophysical methods. Human population growth analysis indicates tremendous waste generation. Flash points of waste generation and dumping were noted. Geographical positioning system was used to take record of sampling point coordinates. Using a sufficient dataset, each grid indicative factor is objectively scaled, weighed and assigned a numerical rating according to their relative importance employing site suitability (S) analysis approach in an empirical equation. Results were imported into a geographic information system (GIS) platform to generate thematic maps. The results showed that subsurface rock and soil characteristics are neither spatially nor vertically homogeneously distributed. Thematic maps were generated and further interpolated in the GIS domain to produce a composite waste dump/landfill suitability index map.
APA, Harvard, Vancouver, ISO, and other styles
48

"GIS Based Groundwater Vulnerability Assessment using DRASTIC Model at Mahi River Basin, Rajasthan, India." International Journal of Innovative Technology and Exploring Engineering 8, no. 9 (July 10, 2019): 1878–92. http://dx.doi.org/10.35940/ijitee.i8440.078919.

Full text
Abstract:
Groundwater is one of the important source to humankind, but there has been an increasing load to this precious resource which has become necessary to study it in detail. In the present study such an attempt has been made to account the groundwater vulnerability using as overlay index method, DRASTIC which is used to prepare a vulnerability map using GIS Technique for Mahi river basin, Rajasthan, India. This method accounts for the aquifer parameters like depth to water, net recharge, aquifer media, soil media, impact of vadose zone and hydraulic conductivity. The DRASTIC Vulnerability index (DVI) is calculated as the sum of product of ratings and weights assigned to each of the parameter on the scale of 1 to 10 and 1 to 5 respectively. The vulnerability index is then classified into five different classes and it was deduced that lies as Very Low (20.6 %), Low (28.23 %), Medium (29.11 %), High (18.82 %), and Very High (3.24 %) Vulnerability zones. Further research is conducted in order to assess the general threat to groundwater growth by the multiple industries, showing that the district will quickly collapse into a Exploited Zone, as the present pattern of growth in the agricultural and Industrial sector remains Continued. The map created for the sustainable use of the aquifer can be used as a managerial assessment in order to track and further Preventive Measures can be taken in advance to control the Growth of various Vulnerability Zones.
APA, Harvard, Vancouver, ISO, and other styles
49

Yang, Peiyu, Divya Katangoori, Scott Noll, Jason Stammen, Brian Suntay, Michael Carlson, and Kevin Moorhouse. "Development and Validation of a Dynamic Abdominal Pressure Twin Sensor Finite Element Model." SAE International Journal of Transportation Safety 11, no. 3 (June 7, 2023). http://dx.doi.org/10.4271/09-11-03-0011.

Full text
Abstract:
<div>Some anthropomorphic test devices (ATDs) currently being developed are equipped with abdominal pressure twin sensors (APTS) for the assessment of abdominal injuries and as an indicator of the occurrence of the submarining of an occupant during a crash event. The APTS is comprised of a fluid-filled polyurethane elastomeric bladder which is sealed by an aluminum cap with an implanted pressure transducer. It is integrated into ATD abdomens, and fluid pressure is increased due to the abdomen/bladder compression due to interactions with the seatbelt or other structures. In this article, a nonlinear dynamic finite element (FE) model is constructed of an APTS using LS-PrePost and converted to the LS-Dyna solver input format. The polyurethane bladder and the internal fluid are represented with viscoelastic and isotropic hypoelastic material models, respectively. The aluminum cap was considered a rigid part since it is significantly stiffer than the bladder and the fluid. To characterize the APTS, dynamic compression tests were conducted on a servo-hydraulic load frame under displacement control and held at the peak compression to allow for stress relaxation prior to slowly releasing the compression amount. The initial peak pressures and loads were 15–17% above the level observed at a 10-second hold period with 50% of the decay occurring within 300 ms. The material properties are identified using an inverse method that minimizes the difference between measured and predicted load and pressure time histories. Further, the bio-fidelity static specifications of the APTS manufacturer are used as a basis to identify the quasi-static material parameters. This approach resulted in a reasonable match between physical test data and model-simulated data for dynamic compressions of 10 mm and 15 mm (~50% compression). Additional compression tests are conducted at two compression levels (5 and 10 mm) and at four load offset configurations for use in the model validation. The FE model was used to predict peak pressure responses within approximately 10% error at full-load capacity and achieved CORA ratings &gt;0.99 for the pressure time history. The proposed inverse method is expected to be generally applicable to the component characterization of other models and sizes of APT sensors.</div>
APA, Harvard, Vancouver, ISO, and other styles
50

Chavdarov, Anatoliy V. "Special Issue No. – 10, June, 2020 Journal > Special Issue > Special Issue No. – 10, June, 2020 > Page 5 “Quantative Methods in Modern Science” organized by Academic Paper Ltd, Russia MORPHOLOGICAL AND ANATOMICAL FEATURES OF THE GENUS GAGEA SALISB., GROWING IN THE EAST KAZAKHSTAN REGION Authors: Zhamal T. Igissinova,Almash A. Kitapbayeva,Anargul S. Sharipkhanova,Alexander L. Vorobyev,Svetlana F. Kolosova,Zhanat K. Idrisheva, DOI: https://doi.org/10.26782/jmcms.spl.10/2020.06.00041 Abstract: Due to ecological preferences among species of the genus GageaSalisb, many plants are qualified as rare and/or endangered. Therefore, the problem of rational use of natural resources, in particular protection of early spring plant species is very important. However, literary sources analysis only reveals data on the biology of species of this genus. The present research,conducted in the spring of 2017-2019, focuses on anatomical and morphological features of two Altai species: Gagealutea and Gagea minima; these features were studied, clarified and confirmed by drawings and photographs. The anatomical structure of the stem and leaf blade was studied in detail. The obtained research results will prove useful for studies of medicinal raw materials and honey plants. The aforementioned species are similar in morphological features, yet G. minima issmaller in size, and its shoots appear earlier than those of other species Keywords: Flora,gageas,Altai species,vegetative organs., Refference: I. Atlas of areas and resources of medicinal plants of Kazakhstan.Almaty, 2008. II. Baitenov M.S. Flora of Kazakhstan.Almaty: Ġylym, 2001. III. DanilevichV. G. ThegenusGageaSalisb. of WesternTienShan. PhD Thesis, St. Petersburg,1996. IV. EgeubaevaR.A., GemedzhievaN.G. The current state of stocks of medicinal plants in some mountain ecosystems of Kazakhstan.Proceedings of the international scientific conference ‘”Results and prospects for the development of botanical science in Kazakhstan’, 2002. V. Kotukhov Yu.A. New species of the genus Gagea (Liliaceae) from Southern Altai. Bot. Journal.1989;74(11). VI. KotukhovYu.A. ListofvascularplantsofKazakhstanAltai. Botan. Researches ofSiberiaandKazakhstan.2005;11. VII. KotukhovYu. The current state of populations of rare and endangered plants in Eastern Kazakhstan. Almaty: AST, 2009. VIII. Kotukhov Yu.A., DanilovaA.N., AnufrievaO.A. Synopsisoftheonions (AlliumL.) oftheKazakhstanAltai, Sauro-ManrakandtheZaisandepression. BotanicalstudiesofSiberiaandKazakhstan. 2011;17: 3-33. IX. Kotukhov, Yu.A., Baytulin, I.O. Rareandendangered, endemicandrelictelementsofthefloraofKazakhstanAltai. MaterialsoftheIntern. scientific-practical. conf. ‘Sustainablemanagementofprotectedareas’.Almaty: Ridder, 2010. X. Krasnoborov I.M. et al. The determinant of plants of the Republic of Altai. Novosibirsk: SB RAS, 2012. XI. Levichev I.G. On the species status of Gagea Rubicunda. Botanical Journal.1997;6:71-76. XII. Levichev I.G. A new species of the genus Gagea (Liliaceae). Botanical Journal. 2000;7: 186-189. XIII. Levichev I.G., Jangb Chang-gee, Seung Hwan Ohc, Lazkovd G.A.A new species of genus GageaSalisb.(Liliaceae) from Kyrgyz Republic (Western Tian Shan, Chatkal Range, Sary-Chelek Nature Reserve). Journal of Asia-Pacific Biodiversity.2019; 12: 341-343. XIV. Peterson A., Levichev I.G., Peterson J. Systematics of Gagea and Lloydia (Liliaceae) and infrageneric classification of Gagea based on molecular and morphological data. Molecular Phylogenetics and Evolution.2008; 46. XV. Peruzzi L., Peterson A., Tison J.-M., Peterson J. Phylogenetic relationships of GageaSalisb.(Liliaceae) in Italy, inferred from molecular and morphological data matrices. Plant Systematics and Evolution; 2008: 276. XVI. Rib R.D. Honey plants of Kazakhstan. Advertising Digest, 2013. XVII. Scherbakova L.I., Shirshikova N.A. Flora of medicinal plants in the vicinity of Ust-Kamenogorsk. Collection of materials of the scientific-practical conference ‘Unity of Education, Science and Innovation’. Ust-Kamenogorsk: EKSU, 2011. XVIII. syganovA.P. PrimrosesofEastKazakhstan. Ust-Kamenogorsk: EKSU, 2001. XIX. Tsyganov A.P. Flora and vegetation of the South Altai Tarbagatay. Berlin: LAP LAMBERT,2014. XX. Utyasheva, T.R., Berezovikov, N.N., Zinchenko, Yu.K. ProceedingsoftheMarkakolskStateNatureReserve. Ust-Kamenogorsk, 2009. XXI. Xinqi C, Turland NJ. Gagea. Flora of China.2000;24: 117-121. XXII. Zarrei M., Zarre S., Wilkin P., Rix E.M. Systematic revision of the genus GageaSalisb. (Liliaceae) in Iran.BotJourn Linn Soc.2007;154. XXIII. Zarrei M., Wilkin P., Ingroille M.J., Chase M.W. A revised infrageneric classification for GageaSalisb. (Tulipeae; Liliaceae): insights from DNA sequence and morphological data.Phytotaxa.2011:5. View | Download INFLUENCE OF SUCCESSION CROPPING ON ECONOMIC EFFICIENCY OF NO-TILL CROP ROTATIONS Authors: Victor K. Dridiger,Roman S. Stukalov,Rasul G. Gadzhiumarov,Anastasiya A. Voropaeva,Viktoriay A. Kolomytseva, DOI: https://doi.org/10.26782/jmcms.spl.10/2020.06.00042 Abstract: This study was aimed at examining the influence of succession cropping on the economic efficiency of no-till field crop rotations on the black earth in the zone of unstable moistening of the Stavropol krai. A long-term stationary experiment was conducted to examine for the purpose nine field crop rotation patterns different in the number of fields (four to six), set of crops, and their succession in crop rotation. The respective shares of legumes, oilseeds, and cereals in the cropping pattern were 17 to 33, 17 to 40, and 50 to 67 %. It has been established that in case of no-till field crop cultivation the economic efficiency of plant production depends on the set of crops and their succession in rotation. The most economically efficient type of crop rotation is the soya-winter wheat-peas-winter wheat-sunflower-corn six-field rotation with two fields of legumes: in this rotation 1 ha of crop rotation area yields 3 850 grain units per ha at a grain unit prime cost of 5.46 roubles; the plant production output return and profitability were 20,888 roubles per ha and 113 %, respectively. The high production profitabilities provided by the soya-winter wheat-sunflower four-field and the soya-winter-wheat-sunflower-corn-winter wheat five-field crop rotation are 108.7 and 106.2 %, respectively. The inclusion of winter wheat in crop rotation for two years in a row reduces the second winter wheat crop yield by 80 to 100 %, which means a certain reduction in the grain unit harvesting rate to 3.48-3.57 thousands per ha of rotation area and cuts the production profitability down to 84.4-92.3 %. This is why, no-till cropping should not include winter wheat for a second time Keywords: No-till technology,crop rotation,predecessor,yield,return,profitability, Refference: I Badakhova G. Kh. and Knutas A. V., Stavropol Krai: Modern Climate Conditions [Stavropol’skiykray: sovremennyyeklimaticheskiyeusloviya]. Stavropol: SUE Krai Communication Networks, 2007. II Cherkasov G. N. and Akimenko A. S. Scientific Basis of Modernization of Crop Rotations and Formation of Their Systems according to the Specializations of Farms in the Central Chernozem Region [Osnovy moderniz atsiisevooborotoviformirovaniyaikh sistem v sootvetstvii so spetsi-alizatsiyeykhozyaystvTsentral’nogoChernozem’ya]. Zemledelie. 2017; 4: 3-5. III Decree 330 of July 6, 2017 the Ministry of Agriculture of Russia “On Approving Coefficients of Converting to Agricultural Crops to Grain Units [Ob utverzhdeniikoeffitsiyentovperevoda v zernovyyee dinitsysel’s kokhozyaystvennykhkul’tur]. IV Dridiger V. K., About Methods of Research of No-Till Technology [O metodikeissledovaniytekhnologii No-till]//Achievements of Science and Technology of AIC (Dostizheniyanaukiitekhniki APK). 2016; 30 (4): 30-32. V Dridiger V. K. and Gadzhiumarov R. G. Growth, Development, and Productivity of Soya Beans Cultivated On No-Till Technology in the Zone of Unstable Moistening of Stavropol Region [Rost, razvitiyeiproduktivnost’ soiprivozdelyvaniipotekhnologii No-till v zone ne-ustoychivog ouvlazhneniyaStavropol’skogokraya]//Oil Crops RTBVNIIMK (Maslichnyyekul’turyNTBVNIIMK). 2018; 3 (175): 52–57. VI Dridiger V. K., Godunova E. I., Eroshenko F. V., Stukalov R. S., Gadzhiumarov, R. G., Effekt of No-till Technology on erosion resistance, the population of earthworms and humus content in soil (Vliyaniyetekhnologii No-till naprotivoerozionnuyuustoychivost’, populyatsiyudozhdevykhcherveyisoderzhaniyegumusa v pochve)//Research Journal of Pharmaceutical, Biological and Chemical Sciences. 2018; 9 (2): 766-770. VII Karabutov A. P., Solovichenko V. D., Nikitin V. V. et al., Reproduction of Soil Fertility, Productivity and Energy Efficiency of Crop Rotations [Vosproizvodstvoplodorodiyapochv, produktivnost’ ienergeticheskayaeffektivnost’ sevooborotov]. Zemledelie. 2019; 2: 3-7. VIII Kulintsev V. V., Dridiger V. K., Godunova E. I., Kovtun V. I., Zhukova M. P., Effekt of No-till Technology on The Available Moisture Content and Soil Density in The Crop Rotation [Vliyaniyetekhnologii No-till nasoderzhaniyedostupnoyvlagiiplotnost’ pochvy v sevoob-orote]// Research Journal of Pharmaceutical, Biological and Chemical Sciences. 2017; 8 (6): 795-99. IX Kulintsev V. V., Godunova E. I., Zhelnakova L. I. et al., Next-Gen Agriculture System for Stavropol Krai: Monograph [SistemazemledeliyanovogopokoleniyaStavropol’skogokraya: Monogtafiya]. Stavropol: AGRUS Publishers, Stavropol State Agrarian University, 2013. X Lessiter Frank, 29 reasons why many growers are harvesting higher no-till yields in their fields than some university scientists find in research plots//No-till Farmer. 2015; 44 (2): 8. XI Rodionova O. A. Reproduction and Exchange-Distributive Relations in Farming Entities [Vosproizvodstvoiobmenno-raspredelitel’nyyeotnosheniya v sel’skokhozyaystvennykhorganizatsiyakh]//Economy, Labour, and Control in Agriculture (Ekonomika, trud, upravleniye v sel’skomkhozyaystve). 2010; 1 (2): 24-27. XII Sandu I. S., Svobodin V. A., Nechaev V. I., Kosolapova M. V., and Fedorenko V. F., Agricultural Production Efficiency: Recommended Practices [Effektivnost’ sel’skokhozyaystvennogoproizvodstva (metodicheskiyerekomendatsii)]. Moscow: Rosinforagrotech, 2013. XIII Sotchenko V. S. Modern Corn Cultivation Technologies [Sovremennayatekhnologiyavozdelyvaniya]. Moscow: Rosagrokhim, 2009. View | Download DEVELOPMENT AND TESTING OF AUTONOMOUS PORTABLE SEISMOMETER DESIGNED FOR USE AT ULTRALOW TEMPERATURES IN ARCTIC ENVIRONMENT Authors: Mikhail A. Abaturov,Yuriy V. Sirotinskiy, DOI: https://doi.org/10.26782/jmcms.spl.10/2020.06.00043 Abstract: This paper is concerned with solving one of the issues of the general problem of designing geophysical equipment for the natural climatic environment of the Arctic. The relevance of the topic has to do with an increased global interest in this region. The paper is aimed at considering the basic principles of developing and the procedure of testing seismic instruments for use at ultralow climatic temperatures. In this paper the indicated issue is considered through the example of a seismic module designed for petroleum and gas exploration by passive seismoacoustic methods. The seismic module is a direct-burial portable unit of around 5 kg in weight, designed to continuously measure and record microseismic triaxial orthogonal (ZNE) noise in a range from 0.1 to 45 Hz during several days in autonomous mode. The functional chart of designing the seismic module was considered, and concrete conclusions were made for choosing the necessary components to meet the ultralow-temperature operational requirements. The conclusions made served for developing appropriate seismic module. In this case, the components and tools used included a SAFT MP 176065 xc low-temperature lithium cell, industrial-spec electronic component parts, a Zhaofeng Geophysical ZF-4.5 Chinese primary electrodynamic seismic sensor, housing seal parts made of frost-resistant silicone materials, and finely dispersed silica gel used as water-retaining sorbent to avoid condensation in the housing. The paper also describes a procedure of low-temperature collation tests at the lab using a New Brunswick Scientific freezing plant. The test results proved the operability of the developed equipment at ultralow temperatures down to -55°C. In addition, tests were conducted at low microseismic noises in the actual Arctic environment. The possibility to detect signals in a range from 1 to 10 Hz at the level close to the NLNM limit (the Peterson model) has been confirmed, which allows monitoring and exploring petroleum and gas deposits by passive methods. As revealed by this study, the suggested approaches are efficient in developing high-precision mobile seismic instruments for use at ultralow climatic temperatures. The solution of the considered instrumentation and methodical issues is of great practical significance as a constituent of the generic problem of Arctic exploration. Keywords: Seismic instrumentation,microseismic monitoring,Peterson model,geological exploration,temperature ratings,cooling test, Refference: I. AD797: Ultralow Distortion, Ultralow Noise Op Amp, Analog Devices, Inc., Data Sheet (Rev. K). Analog Devices, Inc. URL: https://www.analog.com/media/en/technical-documentation/data-sheets/AD797.pdf(Date of access September 2, 2019). II. Agafonov, V. M., Egorov, I. V., and Shabalina, A. S. Operating Principles and Technical Characteristics of a Small-Sized Molecular–Electronic Seismic Sensor with Negative Feedback [Printsipyraboty I tekhnicheskiyekharakteristikimalogabaritnogomolekulyarno-elektronnogoseysmodatchika s otritsatel’noyobratnoysvyaz’yu]. SeysmicheskiyePribory (Seismic Instruments). 2014; 50 (1): 1–8. DOI: 10.3103/S0747923914010022. III. Antonovskaya, G., Konechnaya, Ya.,Kremenetskaya, E., Asming, V., Kvaema, T., Schweitzer, J., Ringdal, F. Enhanced Earthquake Monitoring in the European Arctic. Polar Science. 2015; 1 (9): 158-167. IV. Anthony, R. E., Aster, R. C., Wiens, D., Nyblade, Andr., Anandakrishnan, Sr., Huerta, Audr., Winberry, J. P., Wilson, T., and Rowe, Ch. The Seismic Noise Environment of Antarctica. Seismological Research Letters. 2015; 86(1): 89-100. DOI: 10.1785/0220150005 V. Brincker, R., Lago, T. L., Andersen, P., and Ventura, C. Improving the Classical Geophone Sensor Element by Digital Correction. In Conference Proceedings: IMAC-XXIII: A Conference & Exposition on Structural Dynamics Society for Experimental Mechanics, 2005. URL: https://www.researchgate.net/publication/242452637_Improving_the_Classical_Geophone_Sensor_Element_by_Digital_Correction(Date of access September 2, 2019). VI. Bylaw 164 of the State Committee for Construction of the Russian Federation “On adopting amendments to SNiP 31-01-99 “Construction climatology”. URL: https://base.garant.ru/2322381/(Date of access September 2, 2019). VII. Chao Xu, Junbo Wang, Deyong Chen, Jian Chen, Bowen Liu, Wenjie Qi, XichenZheng, Hua Wei, Guoqing Zhang. The Electrochemical Seismometer Based on a Novel Designed.Sensing Electrode for Undersea Exploration. 20th International Conference on Solid-State Sensors, Actuators and Microsystems &Eurosensors XXXIII (TRANSDUCERS &EUROSENSORS XXXIII). IEEE, 2019. DOI: 10.1109/TRANSDUCERS.2019.8808450. VIII. Chebotareva, I. Ya. New algorithms of emission tomography for passive seismic monitoring of a producing hydrocarbon deposit: Part I. Algorithms of processing and numerical simulation [Novyye algoritmyemissionnoyto mografiidlyapassivnogoseysmicheskogomonitoringarazrabatyvayemykhmestorozhdeniyuglevodorodov. Chast’ I: Algoritmyobrabotki I chislennoyemodelirovaniye]. FizikaZemli. 2010; 46(3):187-98. DOI: 10.1134/S106935131003002X IX. Danilov, A. V. and Konechnaya, Ya. V. Analytical comparison of seismic instruments for stationary surveys in the Arctic [Sravnitel’nyyanalizseysmicheskoyapparaturydlyastatsionarnykhnablyudeniy v Arktike]. DSYS. URL: https://dsys.ru/upload/id254_docPDF_FranzJosefLand.pdf(Date of access September 2, 2019). X. Dew point temperature calculator. Maple Tech. International LLC. URL: https://www.calculator.net/dew-point-calculator.html?airtemperature=20&airtemperatureunit=celsius&humidity=0.34&dewpoint=&dewpointunit=celsius&x=51&y=14(Date of access September 2, 2019). XI. Frolov, A. S. Matching of wave fields recorded by different geophysical receivers [Soglasovaniyevolnovykhpoley, poluchennykh s primeneniyemrazlichnoyregistriruyushcheyapparatury]. Abstracts IX International scientific and technical conference competition of young specialists “Geophysics-2013”. Saint-Petersburg: Gubkin University, 2013. URL: https://www.gubkin.ru/faculty/geology_and_geophysics/chairs_and_departments/exploration_geophysics_and_computers_systems/files/2013_SPb_Frolov.pdf. (Date of access September 2, 2019). XII. Gibbons, S. J., Asming, V., Fedorov, A., Fyen, J., Kero, J., Kozlovskaya, E., Kværna, T., Liszka, L., Näsholm, S.P., Raita, T., Roth, M., Tiira, T., Vinogradov, Yu. The European Arctic: A laboratory for seismoacoustic studies. Seism. Res. Letters. 2015; 86 (3): 917–928. XIII. GOST 8.395-80. State system for ensuring the uniformity of measurements. Reference conditions of measurements while calibrating. General requirements [Gosudarstvennayasistemaobespecheniyaedinstvaizmereniy. Normal’nyyeusloviyaizmereniypripoverke. Obshchiyetrebovaniya]. Moscow: Standartinform, 2008. URL: http://gostrf.com/normadata/1/4294821/4294821960.pdf (Date of access September 2, 2019). XIV. Guralp 6TD. Operators’ Guide. Document Number: MAN-T60-0002, Issue J: April, 2017. Guralp Systems Limited. URL: https://www.guralp.com/documents/MAN-T60-0002.pdf (Date of access September 2, 2019). XV. Inshakova, A. S., Barykina, E. S., and Kozlov, V. V. Role of silica gel in adsorption air drying [Rol’ silikagelya v adsorbtsionnoyosushkevozdukha]. AlleyaNauki (Alley of Science). 2017; 15. URL: https://www.alley- science.ru/domains_data/files/November2017/ROL%20SILIKAGELYa%20V%20ADSORBCIONNOY%20OSUShKE%20VOZDUHA.pdf(Date of access September 2, 2019). XVI. Ioffe, D. and Pozdnyakov, P. Searching for Hidden Reserves of Modern Microchip Circuits. Part I [Poiskskrytykhrezervovsovremennykhmikroskhem. Chast’ I].Komponenty I tekhnologii (Components and Technologies). 2015; 4: 144-46. XVII. Jiang Xu, Xi Wang, Ningyi Yuan, Jianning Ding, Si Qin, Joselito M. Razal, Xuehang Wang, ShanhaiGe, Gogotsi, Yu. Extending the low temperature operational limit of Li-ion battery to −80 °C. Energy Storage Materials (IF0). Published 2019-04-27. DOI: 10.1016/j.ensm.2019.04.033. XVIII. Kouznetsov, O. L., Lyasch, Y. F., Chirkin, I. A., Rizanov, E. G., LeRoy, S. D., Koligaev, S. O. Long-term monitoring of microseismic emissions: Earth tides, fracture distribution, and fluid content. SEG, APPG Interpretation. 2016: 4 (2): T191–T204. XIX. Laverov, N. P., Bogoyavlenskiy, V. I., Bogoyavlenskiy, I. V. Fundamental Aspects of Rational Management of the Petroleum and Gas Resources of the Arctic and the Russian Continental Shelf: Strategy, Prospects, and Problems [Fundamental’nyyeaspektyratsional’nogoosvoyeniyaresursovneftiigazaArktiki I shel’faRossii: strategiya, perspektivyi problem].Arktika: ekologiya I ekonomika [Arctic: Ecology and Economy]. 2016; 2 (22): 4-13. XX. Lee, P. Low Noise Amplifier Selection Guide for Optimal Noise Performance, Analog Devices, Inc., AN-940 Application Note. Analog Devices, Inc. URL: https://www.analog.com/media/en/technical-documentation/application-notes/AN-940.pdf(Date of access September 2, 2019). XXI. Markatis, N., Polychronopoulou, K., Tselentis, Ak. Passive seismic tomography: A passive concept actively evolving. First Break. 2012; 30 (7): 83-90. XXII. Matveev, I. V. and Matveeva, N. V. Portable seismic recorder “SEISAR-5” with very low energy consumption for autonomous work in harsh climatic conditions [Portativnyyseysmicheskiyregistrator «Seysar-5» s ochen’ nizkimenergopotrebleniyemdlyaavtonomnoyraboty v slozhnykhklimatic heskikhusloviyakh]. Nauka I tekhnologicheskierazrabotki (Science and Technological Developments). 2017; 96 (3): 33-40. [Special Issue “Applied Geophysics: New Developments and Results. Part 1. Seismology and Seismic Exploration]. DOI: 10.21455/std2017.3-3. XXIII. Mishra, R. The Temperature Ratings of Electronic Parts.Electronics Cooling magazine. URL: http://www.electronics-cooling.com/2004/02/the-temperature-ratings-of-electronic-parts(Date of access September 2, 2019). XXIV. Moore, Sue E.; Stabeno, Phyllis J.; Van Pelt, Thomas I. The Synthesis of Arctic Research (SOAR) project. Deep-Sea Research Part II. 152: 1-7. DOI: 10.1016/j.dsr2.2018.05.013. XXV. MS-SPORT Viscous Silicone Lubricant with Fluoroplastic. ToR2257-010-45540231-2003. OOO VMPAUTO, URL: https://smazka.ru/attachments/get/469/ms-sport-tds.pdf(Date of access September 2, 2019). XXVI. New Brunswick™ Premium -86 °C Freezers. Operating manual. URL: https://www.eppendorf.com/product-media/doc/en/142770_Operating-Manual/New-Brunswick_Freezers_Operating-manual-86-C-Premium-Freezers.pdf(Date of access September 2, 2019). XXVII. New seismic digitizer/recorder for passive seismic monitoring applications. LandTech Enterprises. URL: http://www.landtechsa.com/Images/Instrument/SRi32L/SRi32L.pdf(Date of access September 2, 2019). XXVIII. Parker, T., Winberry, P., Huerta, A., Bainbridge, G., Devanney, P. Direct Burial Broadband Seismic Instrumentation for Polar Environments. Nanometrics Inc. URL: https://www.nanometrics.ca/sites/default/files/2017-11/direct_burial_bb_seismic_instrumentation_for_polar_environments.pdf. (Date of access September 2, 2019). XXIX. Peterson, J. Observation and Modeling of Seismic Background Noise. Albuquerque, New Mexico: US Department of Interior Geological Survey, 1993. XXX. Razinkov, O.G., Sidorov-Biryukov, D. D., Townsend, B., Parker, T., Bainbridge, G., Greiss, R. Strengths and Applications of Direct Burial Seismic Instruments [Preimushchestva I oblastiprimeneniyaseysmicheskikhpriborovdlyapryamoyustanovki v grunt] in Proc. VI Sci. Tech. Conf. “Problems of Complex Geophysical Monitoring of the Russian Far East”, Petropavlovsk-Kamchatskiy: Geophysical Survey, Russian Academy of Sciences, 2017. URL: http://www.emsd.ru/conf2017lib/pdf/techn/razinkov.pdf (Date of access September 2, 2019). XXXI. Roux, Ph., Wathelet, M., Roueff, Ant. The San Andreas Fault revisited through seismic-noise and surface-wave tomography. Geophysical Research Letters. 2011; 38 (13). DOI: 10.1029/2011GL047811. XXXII. Rubber O-ring seals for hydraulic and pneumatic equipment. Specifications [Kol’tsarezinovyyeuplotnitel’nyyekruglogosecheniyadlyagidravlicheskikh I pnevmaticheskikhustroystv. Tekhnicheskiyeusloviya]. GOST 18829-2017 Interstate standard. Moscow: Standartinform, 2017. URL: https://files.stroyinf.ru/Data/645/64562.pdf (Date of access September 2, 2019). XXXIII. Sanina, I., Gabsatarova, I., Chernykh, О.,Riznichenko, О., Volosov, S., Nesterkina, M., Konstantinovskaya, N. The Mikhnevo small aperture array enhances the resolution property of seismological observations on the East European Platform. Journal of Seismology (JOSE). 2011; 15 (3): 545-56. (DOI: 10.1007/sl0950-010-9211-х). XXXIV. SM-3VK Magnetoelectric Seismic Pickup. Specifications. ToR-4314-001-02698826-01. N. Laverov Federal Centre for Integrated Arctic Research, Russian Academy of Sciences. URL: http://fciarctic.ru/index.php?page=ckpg (Date of access September 2, 2019). XXXV. Sobisevich, A. L.,Presnov, D. A.,Agafonov, V. M.,Sobisevich, L. E. Autonomous geohydroacoustic ice buoy of new generation [Vmorazhivayemyyavtonomnyygeogidroakusticheskiy buy novogopokoleniya]. Nauka I tekhnologicheskierazrabotki (Science and Technological Developments). 2018; 97 (1): 25–34. [Special issue “Precise Geophysical Monitoring of Natural Hazards. Part 1. Instruments andTechnologies”]. DOI: 10.21455/ std2018.1-3. XXXVI. Zhukov, Y. V. Issues of resistance and reliability of electronic equipment products to the exposure factors [Voprosystoykosti i nadezhnostiizdeliyradioelektronnoytekhniki k vneshnimvozdeystvuyushchimfaktoram]. Provintsial’nyyenauchnyyezapiski (The journal Provincial scientific proceedings). 2019; 1 (9): 118-124. View | Download COMPARATIVE ANALYSIS OF RESULTS OF TREATMENT OF PATIENTS WITH FOOT PATHOLOGY WHO UNDERWENT WEIL OPEN OSTEOTOMY BY CLASSICAL METHOD AND WITHOUT STEOSYNTHESIS Authors: Yuriy V. Lartsev,Dmitrii A. Rasputin,Sergey D. Zuev-Ratnikov,Pavel V.Ryzhov,Dmitry S. Kudashev,Anton A. Bogdanov, DOI: https://doi.org/10.26782/jmcms.spl.10/2020.06.00044 Abstract: The article considers the problem of surgical correction of the second metatarsal bone length. The article analyzes the results of treatment of patients with excess length of the second metatarsal bones that underwent osteotomy with and without osteosynthesis. The results of treatment of patients who underwent metatarsal shortening due to classical Weil-osteotomy with and without osteosynthesis were analyzed. The first group consisted of 34 patients. They underwent classical Weil osteotomy. The second group included 44 patients in whomosteotomy of the second metatarsal bone were not by the screw. When studying the results of the treatment in the immediate postoperative period, weeks 6, 12, slightly better results were observed in patients of the first group, while one year after surgical treatment the results in both groups were comparable. One year after surgical treatment, there were 2.9% (1 patient) of unsatisfactory results in the first group and 4.5% (2 patients) in the second group. Considering the comparability of the results of treatment in remote postoperative period, the choice of concrete method remains with the operating surgeon. Keywords: Flat feet,hallux valgus,corrective osteotomy,metatarsal bones, Refference: I. A novel modification of the Stainsby procedure: surgical technique and clinical outcome [Text] / E. Concannon, R. MacNiocaill, R. Flavin [et al.] // Foot Ankle Surg. – 2014. – Dec., Vol. 20(4). – P. 262–267. II. Accurate determination of relative metatarsal protrusion with a small intermetatarsal angle: a novel simplified method [Text] / L. Osher, M.M. Blazer, S. Buck [et al.] // J. Foot Ankle Surg. – 2014. – Sep.-Oct., Vol. 53(5). – P. 548–556. III. Argerakis, N.G. The radiographic effects of the scarf bunionectomy on rearfoot alignment [Text] / N.G. Argerakis, L.Jr. Weil, L.S. Sr. Weil // Foot Ankle Spec. – 2015. – Apr., Vol. 8(2). – P. 89–94. IV. Bauer, T. Percutaneous forefoot surgery [Text] / T. Bauer // Orthop. Traumatol. Surg. Res. – 2014. – Feb., Vol. 100(1 Suppl.). – P. S191–S204. V. Biomechanical Evaluation of Custom Foot Orthoses for Hallux Valgus Deformity [Text] // J. Foot Ankle Surg. – 2015. – Sep.-Oct., Vol.54(5). – P. 852–855. VI. Chopra, S. Characterization of gait in female patients with moderate to severe hallux valgus deformity [Text] / S. Chopra, K. Moerenhout, X. Crevoisier // Clin. Biomech. (Bristol, Avon). – 2015. – Jul., Vol. 30(6). – P. 629–635. VII. Computer assisted planning and custom-made surgical guide for malunited pronation deformity after first metatarsophalangeal joint arthrodesis in rheumatoid arthritis: a case report [Text] / M. Hirao, S. Ikemoto, H. Tsuboi [et al.] // Comput. Aided Surg. – 2014. – Vol. 19(1-3). – P. 13–19. VIII. Correlation between static radiographic measurements and intersegmental angular measurements during gait using a multisegment foot model [Text] / D.Y. Lee, S.G. Seo, E.J. Kim [et al.] // Foot Ankle Int. – 2015. – Jan., Vol.36(1). – P. 1–10. IX. Correlative study between length of first metatarsal and transfer metatarsalgia after osteotomy of first metatarsal [Text]: [Article in Chinese] / F.Q. Zhang, B.Y. Pei, S.T. Wei [et al.] // Zhonghua Yi XueZaZhi. – 2013. – Nov. 19, Vol. 93(43). – P. 3441–3444. X. Dave, M.H. Forefoot Deformity in Rheumatoid Arthritis: A Comparison of Shod and Unshod Populations [Text] / M.H. Dave, L.W. Mason, K. Hariharan // Foot Ankle Spec. – 2015. – Oct., Vol. 8(5). – P. 378–383. XI. Does arthrodesis of the first metatarsophalangeal joint correct the intermetatarsal M1M2 angle? Analysis of a continuous series of 208 arthrodeses fixed with plates [Text] / F. Dalat, F. Cottalorda, M.H. Fessy [et al.] // Orthop. Traumatol. Surg. Res. – 2015. – Oct., Vol. 101(6). – P. 709–714. XII. Dynamic plantar pressure distribution after percutaneous hallux valgus correction using the Reverdin-Isham osteotomy [Text]: [Article in Spanish] / G. Rodríguez-Reyes, E. López-Gavito, A.I. Pérez-Sanpablo [et al.] // Rev. Invest. Clin. – 2014. – Jul., Vol. 66, Suppl. 1. – P. S79-S84. XIII. Efficacy of Bilateral Simultaneous Hallux Valgus Correction Compared to Unilateral [Text] / A.V. Boychenko, L.N. Solomin, S.G. Parfeyev [et al.] // Foot Ankle Int. – 2015. – Nov., Vol. 36(11). – P. 1339–1343. XIV. Endolog technique for correction of hallux valgus: a prospective study of 30 patients with 4-year follow-up [Text] / C. Biz, M. Corradin, I. Petretta [et al.] // J. OrthopSurg Res. – 2015. – Jul. 2, № 10. – P. 102. XV. First metatarsal proximal opening wedge osteotomy for correction of hallux valgus deformity: comparison of straight versus oblique osteotomy [Text] / S.H. Han, E.H. Park, J. Jo [et al.] // Yonsei Med. J. – 2015. – May, Vol. 56(3). – P. 744–752. XVI. Long-term outcome of joint-preserving surgery by combination metatarsal osteotomies for shortening for forefoot deformity in patients with rheumatoid arthritis [Text] / H. Niki, T. Hirano, Y. Akiyama [et al.] // Mod. Rheumatol. – 2015. – Sep., Vol. 25(5). – P. 683–638. XVII. Maceira, E. Transfer metatarsalgia post hallux valgus surgery [Text] / E. Maceira, M. Monteagudo // Foot Ankle Clin. – 2014. – Jun., Vol. 19(2). – P.285–307. XVIII. Nielson, D.L. Absorbable fixation in forefoot surgery: a viable alternative to metallic hardware [Text] / D.L. Nielson, N.J. Young, C.M. Zelen // Clin. Podiatr. Med. Surg. – 2013. – Jul., Vol. 30(3). – P. 283–293 XIX. Patient’s satisfaction after outpatient forefoot surgery: Study of 619 cases [Text] / A. Mouton, V. Le Strat, D. Medevielle [et al.] // Orthop. Traumatol. Surg. Res. – 2015. – Oct., Vol. 101(6 Suppl.). – P. S217–S220. XX. Preference of surgical procedure for the forefoot deformity in the rheumatoid arthritis patients–A prospective, randomized, internal controlled study [Text] / M. Tada, T. Koike, T. Okano [et al.] // Mod. Rheumatol. – 2015. – May., Vol. 25(3). – P.362–366. XXI. Redfern, D. Percutaneous Surgery of the Forefoot [Text] / D. Redfern, J. Vernois, B.P. Legré // Clin. Podiatr. Med. Surg. – 2015. – Jul., Vol. 32(3). – P. 291–332. XXII. Singh, D. Bullous pemphigoid after bilateral forefoot surgery [Text] / D. Singh, A. Swann // Foot Ankle Spec. – 2015. – Feb., Vol. 8(1). – P. 68–72. XXIII. Treatment of moderate hallux valgus by percutaneous, extra-articular reverse-L Chevron (PERC) osteotomy [Text] / J. Lucas y Hernandez, P. Golanó, S. Roshan-Zamir [et al.] // Bone Joint J. – 2016. – Mar., Vol. 98-B(3). – P. 365–373. XXIV. Weil, L.Jr. Scarf osteotomy for correction of hallux abducto valgus deformity [Text] / L.Jr. Weil, M. Bowen // Clin. Podiatr. Med. Surg. – 2014. – Apr., Vol.31(2). – P. 233–246. View | Download QUANTITATIVE ULTRASONOGRAPHY OF THE STOMACH AND SMALL INTESTINE IN HEALTHYDOGS Authors: Roman A. Tcygansky,Irina I. Nekrasova,Angelina N. Shulunova,Alexander I.Sidelnikov, DOI: https://doi.org/10.26782/jmcms.spl.10/2020.06.00045 Abstract: Purpose.To determine the quantitative echogenicity indicators (and their ratio) of the layers of stomach and small intestine wall in healthy dogs. Methods. A prospective 3-year study of 86 healthy dogs (aged 1-7 yrs) of different breeds and of both sexes. Echo homogeneity and echogenicity of the stomach and intestines wall were determined by the method of Silina, T.L., et al. (2010) in absolute values ​​of average brightness levels of ultrasound image pixels using the 8-bit scale with 256 shades of gray. Results. Quantitative echogenicity indicators of the stomach and the small intestine wall in dogs were determined. Based on the numerical values ​​characterizing echogenicity distribution in each layer of a separate structure of the digestive system, the coefficient of gastric echogenicity is determined as 1:2.4:1.1 (mucosa/submucosa/muscle layers, respectively), the coefficient of duodenum and jejunum echogenicity is determined as 1:3.5:2 and that of ileum is 1:1.8:1. Clinical significance. The echogenicity coefficient of the wall of the digestive system allows an objective assessment of the stomach and intestines wall and can serve as the basis for a quantitative assessment of echogenicity changes for various pathologies of the digestive system Keywords: Ultrasound (US),echogenicity,echogenicity coefficient,digestive system,dogs,stomach,intestines, Refference: I. Agut, A. Ultrasound examination of the small intestine in small animals // Veterinary focus. 2009.Vol. 19. No. 1. P. 20-29. II. Bull. 4.RF patent 2398513, IPC51A61B8 / 00 A61B8 / 14 (2006.01) A method for determining the homoechogeneity and the degree of echogenicity of an ultrasound image / T. Silina, S. S. Golubkov. – No. 2008149311/14; declared 12/16/2008; publ. 09/10/2010 III. Choi, M., Seo, M., Jung, J., Lee, K., Yoon, J., Chang, D., Park, RD. Evaluation of canine gastric motility with ultrasonography // J. of Veterinary Medical Science. – 2002. Vol. 64. – № 1. – P. 17-21. IV. Delaney, F., O’Brien, R.T., Waller, K.Ultrasound evaluation of small bowel thickness compared to weight in normal dogs // Veterinary Radiology and Ultrasound. 2003 Vol. 44, № 5. Р 577-580. V. Diana, A., Specchi, S., Toaldo, M.B., Chiocchetti, R., Laghi, A., Cipone, M. Contrast-enhanced ultrasonography of the small bowel in healthy cats // Veterinary Radiology and Ultrasound. – 2011. – Vol. 52, № 5. – Р. 555-559. VI. Garcia, D.A.A., Froes, T.R. Errors in abdominal ultrasonography in dogs and cats // J. of Small Animal Practice. – 2012. Vol. 53. – № 9. – P. 514-519. VII. Garcia, D.A.A., Froes, T.R. Importance of fasting in preparing dogs for abdominal ultrasound examination of specific organs // J. of Small Animal Practice. – 2014. Vol. 55. – № 12. – P. 630-634. VIII. Gaschen, L., Granger, L.A., Oubre, O., Shannon, D., Kearney, M., Gaschen, F. The effects of food intake and its fat composition on intestinal echogenicity in healthy dogs // Veterinary Radiology and Ultrasound. 2016. Vol. 57. № 5. P. 546-550 IX. Gaschen, L., Kircher, P., Stussi, A., Allenspach, K., Gaschen, F., Doherr, M., Grone, A. Comparison of ultrasonographic findings with clinical activity index (CIBDAI) and diagnosis in dogs with chronic enteropathies // Veterinary radiology and ultrasound. – 2008. – Vol. 49. – № 1. – Р. 56-64. X. Gil, E.M.U. Garcia, D.A.A. Froes, T.R. In utero development of the fetal intestine: Sonographic evaluation and correlation with gestational age and fetal maturity in dogs // Theriogenology. 2015. Vol. 84, №5. Р. 681-686. XI. Gladwin, N.E. Penninck, D.G., Webster, C.R.L. Ultrasonographic evaluation of the thickness of the wall layers in the intestinal tract of dogs // American Journal of Veterinary Research. 2014. Vol. 75, №4. Р. 349-353. XII. Gory, G., Rault, D.N., Gatel, L, Dally, C., Belli, P., Couturier, L., Cauvin, E. Ultrasonographic characteristics of the abdominal esophagus and cardia in dogs // Veterinary Radiology and Ultrasound. 2014. Vol. 55, № 5. P. 552-560. XIII. Günther, C.S. Lautenschläger, I.E., Scholz, V.B. Assessment of the inter- and intraobserver variability for sonographical measurement of intestinal wall thickness in dogs without gastrointestinal diseases | [Inter-und Intraobserver-Variabilitätbei der sonographischenBestimmung der Darmwanddicke von HundenohnegastrointestinaleErkrankungen] // Tierarztliche Praxis Ausgabe K: Kleintiere – Heimtiere. 2014. Vol. 42 №2. Р. 71-78. XIV. Hanazono, K., Fukumoto, S., Hirayama, K., Takashima, K., Yamane, Y., Natsuhori, M., Kadosawa, T., Uchide, T. Predicting Metastatic Potential of gastrointestinal stromal tumors in dog by ultrasonography // J. of Veterinary Medical Science. – 2012. Vol. 74. – № 11. – P. 1477-1482. XV. Heng, H.G., Lim, Ch.K., Miller, M.A., Broman, M.M.Prevalence and significance of an ultrasonographic colonic muscularishyperechoic band paralleling the serosal layer in dogs // Veterinary Radiology and Ultrasound. 2015. Vol. 56 № 6. P. 666-669. XVI. Ivančić, M., Mai, W. Qualitative and quantitative comparison of renal vs. hepatic ultrasonographic intensity in healthy dogs // Veterinary Radiology and Ultrasound. 2008. Vol. 49. № 4. Р. 368-373. XVII. Lamb, C.R., Mantis, P. Ultrasonographic features of intestinal intussusception in 10 dogs // J. of Small Animal Practice. – 2008. Vol. 39. – № 9. – P. 437-441. XVIII. Le Roux, A. B., Granger, L.A., Wakamatsu, N, Kearney, M.T., Gaschen, L.Ex vivo correlation of ultrasonographic small intestinal wall layering with histology in dogs // Veterinary Radiology and Ultrasound.2016. Vol. 57. № 5. P. 534-545. XIX. Nielsen, T. High-frequency ultrasound of Peyer’s patches in the small intestine of young cats / T. Nielsen [et al.] // Journal of Feline Medicine and Surgery. – 2015. – Vol. 18, № 4. – Р. 303-309. XX. PenninckD.G. Gastrointestinal tract. In Nyland T.G., Mattoon J.S. (eds): Small Animal Diagnostic Ultrasound. Philadelphia: WB Saunders. 2002, 2nd ed. Р. 207-230. XXI. PenninckD.G. Gastrointestinal tract. In: PenninckD.G.,d´Anjou M.A. Atlas of Small Animal Ultrasonography. Blackwell Publishing, Iowa. 2008. Р. 281-318. XXII. Penninck, D.G., Nyland, T.G., Kerr, L.Y., Fisher, P.E. Ultrasonographic evaluation of gastrointestinal diseases in small animals // Veterinary Radiology. 1990. Vol. 31. №3. P. 134-141. XXIII. Penninck, D.G.,Webster, C.R.L.,Keating, J.H. The sonographic appearance of intestinal mucosal fibrosis in cats // Veterinary Radiology and Ultrasound. – 2010. – Vol. 51, № 4. – Р. 458-461. XXIV. Pollard, R.E.,Johnson, E.G., Pesavento, P.A., Baker, T.W., Cannon, A.B., Kass, P.H., Marks, S.L. Effects of corn oil administered orally on conspicuity of ultrasonographic small intestinal lesions in dogs with lymphangiectasia // Veterinary Radiology and Ultrasound. 2013. Vol. 54. № 4. P. 390-397. XXV. Rault, D.N., Besso, J.G., Boulouha, L., Begon, D., Ruel, Y. Significance of a common extended mucosal interface observed in transverse small intestine sonograms // Veterinary Radiology and Ultrasound. 2004. Vol. 45. №2. Р. 177-179. XXVI. Sutherland-Smith, J., Penninck, D.G., Keating, J.H., Webster, C.R.L. Ultrasonographic intestinal hyperechoic mucosal striations in dogs are associated with lacteal dilation // Veterinary Radiology and Ultrasound. – 2007. Vol. 48. – № 1. – P. 51-57. View | Download EVALUATION OF ADAPTIVE POTENTIAL IN MEDICAL STUDENTS IN THE CONTEXT OF SEASONAL DYNAMICS Authors: Larisa A. Merdenova,Elena A. Takoeva,Marina I. Nartikoeva,Victoria A. Belyayeva,Fatima S. Datieva,Larisa R. Datieva, DOI: https://doi.org/10.26782/jmcms.spl.10/2020.06.00046 Abstract: The aim of this work was to assess the functional reserves of the body to quantify individual health; adaptation, psychophysiological characteristics of the health quality of medical students in different seasons of the year. When studying the temporal organization of physiological functions, the rhythm parameters of physiological functions were determined, followed by processing the results using the Cosinor Analysis program, which reveals rhythms with an unknown period for unequal observations, evaluates 5 parameters of sinusoidal rhythms (mesor, amplitude, acrophase, period, reliability). The essence of desynchronization is the mismatch of circadian rhythms among themselves or destruction of the rhythms architectonics (instability of acrophases or their disappearance). Desynchronization with respect to the rhythmic structure of the body is of a disregulatory nature, most pronounced in pathological desynchronization. High neurotism, increased anxiety reinforces the tendency to internal desynchronization, which increases with stress. During examination stress, students experience a decrease in the stability of the temporary organization of the biosystem and the tension of adaptive mechanisms develops, which affects attention, mental performance and the quality of adaptation to the educational process. Time is shortened and the amplitude of the “initial minute” decreases, personal and situational anxiety develops, and the level of psychophysiological adaptation decreases. The results of the work are priority because they can be used in assessing quality and level of health. Keywords: Desynchronosis,biorhythms,psycho-emotional stress,mesor,acrophase,amplitude,individual minute, Refference: I. Arendt, J., Middleton, B. Human seasonal and circadian studies in Antarctica (Halley, 75_S) – General and Comparative Endocrinology. 2017: 250-259. (http://dx.doi.org/10.1016/j.ygcen.2017.05.010). II. BalandinYu.P. A brief methodological guide on the use of the agro-industrial complex “Health Sources” / Yu.P. Balandin, V.S. Generalov, V.F. Shishlov. Ryazan, 2007. III. Buslovskaya L.K. Adaptation reactions in students at exam stress/ L.K. Buslovskaya, Yu.P. Ryzhkova. Scientific bulletin of Belgorod State University. Series: Natural Sciences. 2011;17(21):46-52. IV. Chutko L. S. Sindromjemocionalnogovygoranija – Klinicheskie I psihologicheskieaspekty./ L.S Chutko. Moscow: MEDpress-inform, 2013. V. Eroshina K., Paul Wilkinson, Martin Mackey. The role of environmental and social factors in the occurrence of diseases of the respiratory tract in children of primary school age in Moscow. Medicine. 2013:57-71. VI. Fagrell B. “Microcirculation of the Skin”. The physiology and pharmacology of the microcirculation. 2013:423. VII. Gurova O.A. Change in blood microcirculation in students throughout the day. New research. 2013; 2 (35):66-71. VIII. Khetagurova L.G. – Stress/Ed. L.G. Khetagurov. Vladikavkaz: Project-Press Publishing House, 2010. IX. Khetagurova L.G., Urumova L.T. et al. Stress (chronomedical aspects). International Journal of Experimental Education 2010; 12: 30-31. X. Khetagurova L.G., Salbiev K.D., Belyaev S.D., Datieva F.S., Kataeva M.R., Tagaeva I.R. Chronopathology (experimental and clinical aspects/ Ed. L.G. Khetagurov, K.D. Salbiev, S.D.Belyaev, F.S. Datiev, M.R. Kataev, I.R. Tagaev. Moscow: Science, 2004. XI. KlassinaS.Ya. Self-regulatory reactions in the microvasculature of the nail bed of fingers in person with psycho-emotional stress. Bulletin of new medical technologies, 2013; 2 (XX):408-412. XII. Kovtun O.P., Anufrieva E.V., Polushina L.G. Gender-age characteristics of the component composition of the body in overweight and obese schoolchildren. Medical Science and Education of the Urals. 2019; 3:139-145. XIII. Kuchieva M.B., Chaplygina E.V., Vartanova O.T., Aksenova O.A., Evtushenko A.V., Nor-Arevyan K.A., Elizarova E.S., Efremova E.N. A comparative analysis of the constitutional features of various generations of healthy young men and women in the Rostov Region. Modern problems of science and education. 2017; 5:50-59. XIV. Mathias Adamsson1, ThorbjörnLaike, Takeshi Morita – Annual variation in daily light expo-sure and circadian change of melatonin and cortisol consent rations at a northern latitude with large seasonal differences in photoperiod length – Journal of Physiological Anthropology. 2017; 36: 6 – 15. XV. Merdenova L.A., Tagaeva I.R., Takoeva E.A. Features of the study of biological rhythms in children. The results of fundamental and applied research in the field of natural and technical sciences. Materials of the International Scientific and Practical Conference. Belgorod, 2017, pp. 119-123. XVI. Ogarysheva N.V. The dynamics of mental performance as a criterion for adapting to the teaching load. Bulletin of the Samara Scientific Center of the Russian Academy of Sciences. 2014;16:5 (1): S.636-638. XVII. Pekmezovi T. Gene-environment interaction: A genetic-epidemiological approach. Journal of Medical Biochemistry. 2010;29:131-134. XVIII. Rapoport S.I., Chibisov S.M. Chronobiology and chronomedicine: history and prospects/Ed. S.M. Chibisov, S.I. Rapoport ,, M.L. Blagonravova. Chronobiology and Chronomedicine: Peoples’ Friendship University of Russia (RUDN) Press. Moscow, 2018. XIX. Roustit M., Cracowski J.L. “Non-invasive assessment of skin microvascular function in humans: an insight into methods” – Microcirculation 2012; 19 (1): 47-64. XX. Rud V.O., FisunYu.O. – References of the circadian desinchronosis in students. Ukrainian Bulletin of Psychoneurology. 2010; 18(2) (63): 74-77. XXI. Takoeva Z. A., Medoeva N. O., Berezova D. T., Merdenova L. A. et al. Long-term analysis of the results of chronomonitoring of the health of the population of North Ossetia; Vladikavkaz Medical and Biological Bulletin. 2011; 12(12,19): 32-38. XXII. Urumova L.T., Tagaeva I.R., Takoeva E.A., Datieva L.R. – The study of some health indicators of medical students in different periods of the year. Health and education in the XXI century. 2016; 18(4): 94-97. XXIII. Westman J. – Complex diseases. In: Medical genetics for the modern clinician. USA: Lippincott Williams & Wilkins, 2006. XXIV. Yadrischenskaya T.V. Circadian biorhythms of students and their importance in educational activities. Problems of higher education. Pacific State University Press. 2016; 2:176-178. View | Download TRIADIC COMPARATIVE ANALYSIS Authors: Stanislav A.Kudzh,Victor Ya. Tsvetkov, DOI: https://doi.org/10.26782/jmcms.spl.10/2020.06.00047 Abstract: The present study of comparison methods based on the triadic model introduces the following concepts: the relation of comparability and the relation of comparison, and object comparison and attributive comparison. The difference between active and passive qualitative comparison is shown, two triadic models of passive and active comparison and models for comparing two and three objects are described. Triadic comparison models are proposed as an alternative to dyadic comparison models. Comparison allows finding the common and the different; this approach is proposed for the analysis of the nomothetic and ideographic method of obtaining knowledge. The nomothetic method identifies and evaluates the general, while the ideographic method searches for unique in parameters and in combinations of parameters. Triadic comparison is used in systems and methods of argumentation, as well as in the analysis of consistency/inconsistency. Keywords: Comparative analysis,dyad,triad,triadic model,comparability relation,object comparison,attributive comparison,nomothetic method,ideographic method, Refference: I. AltafS., Aslam.M.Paired comparison analysis of the van Baarenmodel using Bayesian approach with noninformativeprior.Pakistan Journal of Statistics and Operation Research 8(2) (2012) 259{270. II. AmooreJ. E., VenstromD Correlations between stereochemical assessments and organoleptic analysis of odorous compounds. Olfaction and Taste (2016) 3{17. III. BarnesJ., KlingerR. Embedding projection for targeted cross-lingual sentiment: model comparisons and a real-world study. Journal of Artificial Intelligence Research 66 (2019) 691{742. doi.org/10.1613/jair.1.11561 IV. Castro-SchiloL., FerrerE.Comparison of nomothetic versus idiographic-oriented methods for making predictions about distal outcomes from time series data. Multivariate Behavioral Research 48(2) (2013) 175{207. V. De BonaG.et al. Classifying inconsistency measures using graphs. Journal of Artificial Intelligence Research 66 (2019) 937{987. VI. FideliR. La comparazione. Milano: Angeli, 1998. VII. GordonT. F., PrakkenH., WaltonD. The Carneades model of argument and burden of proof. Artificial Intelligence 10(15) (2007) 875{896. VIII. GrenzS.J. The social god and the relational self: A Triad theology of the imago Dei. Westminster: John Knox Press, 2001. IX. HermansH.J. M.On the integration of nomothetic and idiographic research methods in the study of personal meaning.Journal of Personality 56(4) (1988) 785{812. X. JamiesonK. G., NowakR. Active ranking using pairwise comparisons.Advances in Neural Information Processing Systems (2011) 2240{2248. XI. JongsmaC.Poythress’s triad logic: a review essay. Pro Rege 42(4) (2014) 6{15. XII. KärkkäinenV.M. Trinity and Religious Pluralism: The Doctrine of the Trinity in Christian Theology of Religions. London: Routledge, 2017. XIII. KudzhS. A., TsvetkovV.Ya. Triadic systems. Russian Technology Magazine 7(6) (2019) 74{882. XIV. NelsonK.E.Some observations from the perspective of the rare event cognitive comparison theory of language acquisition.Children’s Language 6 (1987) 289{331. XV. NiskanenA., WallnerJ., JärvisaloM.Synthesizing argumentation frameworks from examples. Journal of Artificial Intelligence Research 66 (2019) 503{554. XVI. PührerJ.Realizability of three-valued semantics for abstract dialectical frameworks.Artificial Intelligence 278 (2020) 103{198. XVII. SwansonG.Frameworks for comparative research: structural anthropology and the theory of action. In: Vallier, Ivan (Ed.). Comparative methods in sociology: essays on trends and applications.Berkeley: University of California Press, 1971 141{202. XVIII. TsvetkovV.Ya.Worldview model as the result of education.World Applied Sciences Journal 31(2) (2014) 211{215. XIX. TsvetkovV. Ya. Logical analysis and variable scales. Slavic Forum 4(22) (2018) 103{109. XX. Wang S. et al. Transit traffic analysis zone delineating method based on Thiessen polygon. Sustainability 6(4) (2014) 1821{1832. View | Download DEVELOPING TECHNOLOGY OF CREATING WEAR-RESISTANT CERAMIC COATING FOR ICE CYLINDER." JOURNAL OF MECHANICS OF CONTINUA AND MATHEMATICAL SCIENCES spl10, no. 1 (June 28, 2020). http://dx.doi.org/10.26782/jmcms.spl.10/2020.06.00048.

Full text
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography