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Статті в журналах з теми "Tidal basins Mathematical models"
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R., Bustami, Hong C., and Lim D. "River Bedup Catchment Water Level Prediction Using Pre-developed ANN Model of Siniawan Catchment." Journal of Civil Engineering, Science and Technology 2, no. 1 (March 1, 2011): 36–41. http://dx.doi.org/10.33736/jcest.86.2011.
Повний текст джерелаАнотація:
This study proposes the application of Artificial Neural Network (ANN) in the prediction of hourly water level under tidal influence for Sadong Basin. An ANN is undoubtedly a robust tool for forecasting various non-linear hydrologic processes, including the water level prediction. It is a flexible mathematical structure which is capable to generalize patterns in imprecise or noisy and ambiguous input and output data sets. In this study, ANN models were developed specifically to forecast the hourly water level for River Bedup Station. Distinctive networks were trained, validated and simulated using hourly data obtained from Department of Irrigation and Drainage, Sarawak in Kuching. The performances of ANN were evaluated based on the coefficient of efficiency, E2 and the coefficient of correlation, R. The back propagation algorithm was adopted for this study. Models used in this study is trained, validated and simulated with scaled conjugate gradient algorithm (trainscg) with two hours of antecedent data, learning rate and the number of neurons in the hidden layer of 0.8 and 40 respectively. In this study, the models generated an accuracy of 100% for all training, validating and simulating stages. It has been found that the ANN has the potential to solve the problems of water level prediction.
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FEDORCHUK, A. "Analysis of modern models of counterfeiting surfaces for determination of heights by GNSS-leveling method." Modern achievements of geodesic science and industry 2, no. 44 (September 1, 2022): 31–41. http://dx.doi.org/10.33841/1819-1339-2-44-31-41.
Повний текст джерелаАнотація:
This paper discusses various sources of information related to the issue of determining heights by GNSS-leveling. Implementation of the GNSS leveling method requires the presence of geoid or quasi-geoid heights, which today can be obtained from the corresponding models. In recent decades, scientists from around the world have developed many global, regional and local models of geoid and quasigeoid. This has contributed to the emergence of numerous publications on GNSS leveling. The purpose of the work is to perform the analysis of modern models of reference surfaces on the basis of materials of scientific publications according to the criteria that have a significant impact on research in the field of determining the height by GNSS-leveling. Method. The paper considers 44 publications published in the period 2001–2021. Among the research in this direction, there are three types of work: 1) 13 publications on methods of constructing the models themselves; 2) 12 works on their accuracy analysis and 3) 19 works on “adjustment” of model heights. At the first stage of the research the analysis was performed according to criteria related to geoid and quasi-geoid surface modeling, including Stokes and Molodensky theory, mathematical methods of data analysis and processing, tidal systems, zero-order geoid undulation and scale levels of geoid and quasi-geoid models. In the second stage, the frequency of publications by years was analyzed and the activity of publications of existing geoid and quasigeoid models on the sample of countries, which was made on the basis of all selected works in this study, was established. At the third stage, a quantitative analysis of official published models of geoid and quasi-geoid on the frequency of publications for the study period. The ratio of the accuracy of the heights of global geoid models in relation to the magnitude of the degree and order of their calculation is established. Results. In 58 % of the analyzed works, the authors use Stokes’ theory in their research, and in 42 % – Molodensky’s theory. Among the mathematical methods of data analysis and processing, 27 % use the method of mean square collocation, 20 % use the least squares method, the “delete-restore” method and the method of modifying Stokes’ formula with least squares (or KTH-method). The Fast Fourier transform method was used in 13 % of the works. Publications on the creation of global models of the Earth mostly use the parameters of the tide free tidal system in their calculations – a total of 40 % works. No less important criterion (33 % of works) should be taken into account the parameter of undulation of the geoid of zero order (“zero degree term”). In total, 41 % of research is aimed at creating and analyzing quasi-geoid models on a regional scale. During the study period, most works were published in 2012 and 2018. Leading countries in the development of quasi-geoid models are Canada, Poland, Sweden and the United States, and global geoid models are Germany, the United States and China. For the period 2001–2021, 99 global geoid models of various degree and order were officially presented, among which GOCO, EIGEN and EGM series models are most often used for research. Also during this period, 177 quasi-geoid models were presented, the most of which were published in 2019. Based on these data, the relationship with the frequency of publications in 2008–2021 can be traced. The accuracy of global geoid models in relation to the degree and order of their calculation is systematic in the range of 0.52–1.92 m, 0.38–0.50 m, 0.23–0.38 m and 0.12–0,14 m for models 60-220, 220-260, 260-720 and 720-2190 degree and order respectively. Scientific novelty. It is shown that the analysis of modern models of reference surfaces on the basis of materials of scientific publications in the field of GNSS-leveling method allows establishing the existing advantages and disadvantages of research in this field. Practical significance. The data of such analysis can be used to solve key problems in determining the height of the GNSS-leveling method, which require further research and to find modernized solutions.
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Ellis, Kathryn K., Timothy Callahan, Dianne I. Greenfield, Denise Sanger, Joshua Robinson, and Martin Jones. "Measuring and Modeling Flow Rates in Tidal Creeks: A Case Study from the Central Coast of South Carolina." Journal of South Carolina Water Resources, no. 4 (June 1, 2017): 21–39. http://dx.doi.org/10.34068/jscwr.04.03.
Повний текст джерелаАнотація:
The purpose of this study was to collect site- and condition-specific hydrology data to better understand the water flow dynamics of tidal creeks and terrestrial runoff from surrounding watersheds. In this paper, we developed mathematical models of tidal creek flow (discharge) in relation to time during a tidal cycle and also estimated terrestrial runoff volume from design storms to compare to tidal creek volumes. Currently, limited data are available about how discharge in tidal creeks behaves as a function of stage or the time of tide (i.e., rising or falling tide) for estuaries in the southeastern United States, so this information fills an existing knowledge gap. Ultimately, findings from this study will be used to inform managers about numeric nutrient criteria (nitrogen-N and phosphorus-P) when it is combined with biological response (e.g., phytoplankton assemblages) data from a concurrent study. We studied four tidal creek sites, two in the Ashepoo-Combahee-Edisto (ACE) Basin and two in the Charleston Harbor system. We used ArcGIS to delineate two different watersheds for each study site, to classify the surrounding land cover using the NOAA Coastal Change Analysis Program (C-CAP) data, and to analyze the soils using the NRCS Soil Survey Geographic database (SSURGO). The size of the U.S. Geological Survey’s Elevation Derivatives for National Application (EDNA) watersheds varied from 778 to 2,582 ha; smaller geographic watersheds were delineated for all sites (except Wimbee) for stormwater modeling purposes. The two sites in Charleston Harbor were within the first-order Horlbeck Creek and the second-order Bulls Creek areas. The ACE Basin sites were within the third-order Big Bay Creek and the fourth-order Wimbee Creek areas. We measured the stage and discharge in each creek with an acoustic Doppler current profiler (ADCP) unit for multiple tide conditions over a 2-year period (2015–2016) with the goal of encompassing as large of a range of tide stage and discharge data measurements as possible. The Stormwater Runoff Modeling System (SWARM) was also used to estimate the potential water entering the creeks from the land surface; this volume was very small relative to the tide water volume except for the more-developed Bulls Creek watershed. The results show that the peak discharge occurred on the ebb tide and that the duration of the flood tide spanned a longer period of time; both of these observations are consistent with traits associated with an ebb-dominated tidal creek system. The tidal inflow and outflow (flood and ebb tides, respectively) showed an asymmetrical pattern with respect to stage and discharge; peak discharge during the flood (rising) tide occurred at a higher stage than for the peak discharge during the ebb (falling) tide. This is not an unexpected result, as the water on an ebb tide is moving down gradient funneled through the creek channel toward the coast. Furthermore, water moving with the rising flood tide must overcome frictional losses due to the marsh bank and vegetation; i.e., the peak discharge can only happen when the water has risen above these impediments. We infer from the flow dynamics data that faster water velocities during ebb tide imply that more erosive energy could transport a larger mass of suspended solids and associated nutrients (e.g., orthophosphate) from the estuary to the coastal ocean. However, the discharge and runoff modeling indicate that land-based flux was important in the developed Bulls Creek watershed, but not at the larger and less-developed Big Bay Creek watershed. At Big Bay Creek, the relatively large tidal discharge volume compared to the smaller potential runoff generated within the watershed indicates that the creek could potentially dilute terrestrial runoff contaminants. Smaller, more-urbanized tidal wetland systems may not benefit from such dilution effects and thus are vulnerable to increased runoff from adjacent developed landscapes.
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Wang, Zheng Bing, Edwin P. L. Elias, Ad J. F. van der Spek, and Quirijn J. Lodder. "Sediment budget and morphological development of the Dutch Wadden Sea: impact of accelerated sea-level rise and subsidence until 2100." Netherlands Journal of Geosciences 97, no. 3 (September 2018): 183–214. http://dx.doi.org/10.1017/njg.2018.8.
Повний текст джерелаАнотація:
AbstractThe Wadden Sea is a unique coastal wetland containing an uninterrupted stretch of tidal flats that span a distance of nearly 500km along the North Sea coast from the Netherlands to Denmark. The development of this system is under pressure of climate change and especially the associated acceleration in sea-level rise (SLR). Sustainable management of the system to ensure safety against flooding of the hinterland, to protect the environmental value and to optimise the economic activities in the area requires predictions of the future morphological development.The Dutch Wadden Sea has been accreting by importing sediment from the ebb-tidal deltas and the North Sea coasts of the barrier islands. The average accretion rate since 1926 has been higher than that of the local relative SLR. The large sediment imports are predominantly caused by the damming of the Zuiderzee and Lauwerszee rather than due to response to this rise in sea level. The intertidal flats in all tidal basins increased in height to compensate for SLR.The barrier islands, the ebb-tidal deltas and the tidal basins that comprise tidal channels and flats together form a sediment-sharing system. The residual sediment transport between a tidal basin and its ebb-tidal delta through the tidal inlet is influenced by different processes and mechanisms. In the Dutch Wadden Sea, residual flow, tidal asymmetry and dispersion are dominant. The interaction between tidal channels and tidal flats is governed by both tides and waves. The height of the tidal flats is the result of the balance between sand supply by the tide and resuspension by waves.At present, long-term modelling for evaluating the effects of accelerated SLR mainly relies on aggregated models. These models are used to evaluate the maximum rates of sediment import into the tidal basins in the Dutch Wadden Sea. These maximum rates are compared to the combined scenarios of SLR and extraction-induced subsidence, in order to explore the future state of the Dutch Wadden Sea.For the near future, up to 2030, the effect of accelerated SLR will be limited and hardly noticeable. Over the long term, by the year 2100, the effect depends on the SLR scenarios. According to the low-end scenario, there will be hardly any effect due to SLR until 2100, whereas according to the high-end scenario the effect will be noticeable already in 2050.
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Li, Wen Dan, and Meng Guo Li. "Suspension-Diffusion Mathematical Model Calculation for Wenzhou Shoal in Construction Period." Advanced Materials Research 1065-1069 (December 2014): 453–56. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.453.
Повний текст джерелаАнотація:
By means of natural condition and mathematical models of tidal flow and sediment, numerical study is carried out on suspension-diffusion in construction period after the reclamation project of Wenzhou shoal at Oujiang estuary in this paper. The main conclusions are: the suspension-diffusion is controlled by tidal current. The range of suspended sediment concentration more than 10mg/L is mostly in Wenzhou shoal area during filling sand construction, which is the continuous operation. Riprap construction is Instantaneous work; the range of scatter is limited.
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Lim, Sin Liang, and B. S. Daya Sagar. "Derivation of Geodesic Flow Fields and Spectrum in Digital Topographic Basins." Discrete Dynamics in Nature and Society 2008 (2008): 1–26. http://dx.doi.org/10.1155/2008/312870.
Повний текст джерелаАнотація:
We present a framework to characterize terrestrial functions—surficial and bottom topographic regions that are represented, respectively, as raster digital elevation models (DEMs) and digital bathymetric models (DBMs)—through analysis of flow fields that are simulated via geodesic morphology. Characterization of such functions is done via a new descriptor. Computation of this new descriptor involves the following steps: (i) basin in digital form representing topographic fluctuations as an input, (ii) threshold decomposition of basin—that consists of channelized and nonchannelized regions—into sets, (iii) proper indexing of these sets to decide the marker set(s) and its (their) corresponding mask set(s), (iv) performing geodesic propagation that provides basic flow field structures, and (v) finally providing a new basin descriptor—geodesic spectrum. We demonstrated this five-step framework on five different synthetic and/or realistic DEMs and/or DBMs. This study provides potentially invaluable insights to further study the travel-time flood propagation within basins of both fluvial and tidal systems.
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Côté, Jessica, and Kathryn Ketteridge. "TIDAL CHANNEL GEOMETRY OF BARRIER EMBAYMENT SYSTEMS IN PUGET SOUND." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 76. http://dx.doi.org/10.9753/icce.v36.currents.76.
Повний текст джерелаАнотація:
This paper will present the first year of findings from a research project with the objective of producing empirically based models of tidal channel characteristics that can be broadly applied to design estuary restoration projects in Puget Sound. A combination of field data collection methods and desktop analysis are being utilized to calculate tidal prism, channel dimensions, marsh extent, and water surface elevations to parameterize well-functioning barrier embayments in Puget Sound. The tidal channel data will be used to conduct a regression analysis and develop hydraulic geometry scaling relationships. The goal of the study is to develop one set of regression lines for the Puget Sound basin; however, if the data collection reveals important differences between sub-basins, then two or more regressions may be developed. For example, Hood (2015) found wave exposure contributed to differences in tidal channel geometry in the major river deltas within Puget Sound. Differences in wave exposure and tide range among the sub-regions of Puget Sound could create a need for creating more than one set of scaling relationships (e.g. North Sound and South Sound).
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Yiew, Lucas J., and Allan R. Magee. "Deriving tidal currents from AIS data." Journal of Physics: Conference Series 2311, no. 1 (July 1, 2022): 012003. http://dx.doi.org/10.1088/1742-6596/2311/1/012003.
Повний текст джерелаАнотація:
Abstract In this study, a method is proposed to derive ocean surface current conditions using only information available through AIS – mainly speed over ground (SOG), course over ground (COG) and vessel heading. This method allows the mapping of current conditions over large areas, in doing so gives seafarers better awareness and advance warning of local environmental conditions. This also helps in route planning and management of voyage-related resources. In the proposed method, current speeds and directions are solved through a system of equations containing the resolved SOG, COG and heading of multiple ships. This method was tested using mathematical manoeuvring models, and then subsequently using AIS data collected from vessel traffic in the Western Singapore Straits. Current predictions using this method are validated against physics-based depth-averaged hydrodynamic models driven by astronomical tidal forcing.
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Yu, Feng, and Yong Yin. "Oil Spill Visualization Based on the Numeric Simulation of Tidal Current." International Journal of Virtual Reality 8, no. 2 (January 1, 2009): 71–74. http://dx.doi.org/10.20870/ijvr.2009.8.2.2727.
Повний текст джерелаАнотація:
This paper proposes an approach to implement the 3D visualization of oil spill based on tidal hydrodynamic model. It simulates tidal current of M2 component tide in Jiaozhou Bay. The simulation results conform to the tidal theory and probably conform to the flow measurement report of crude oil pier Phase III at Qingdao Harbor. Based on tidal current and eye-point related adaptive ocean surface mesh model, by analyzing the drift and diffusion mathematical models of oil spill on the sea, the dynamic visualization of drift and diffusion course of oil on the sea were implemented, the visualization result is satisfactory.
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Savvidis, Y. G., C. G. Koutitas, and Y. N. Krestenitis. "Modelling the water mass exchange through navigational channels connecting adjacent coastal basins - application to the Channel of Potidea (North Aegean Sea)." Annales Geophysicae 23, no. 2 (February 28, 2005): 231–38. http://dx.doi.org/10.5194/angeo-23-231-2005.
Повний текст джерелаАнотація:
Abstract. The research objective is the detection of the mechanism of the water mass exchange through a navigational channel connecting two adjacent coastal basins. The research involves the application of a mathematical model in parallel to in-situ measurements. The hydrodynamic circulation in the greater area of the NW Aegean Sea is modeled by means of a barotropic circulation model. Wind, Coriolis and Tide are the main forcings taken into account. The flow through the channel is resolved at a subgrid scale by means of a local open channel flow model. The comparison between field measurements, recorded during a limited period, and the model results supports the model verification. The study is integrated by an operational application of the model under various realistic forcings. The results help to gain a better understanding of the mechanisms regulating the water mass exchange and the consequent interaction between two adjacent connected coastal basins. From the case study of the Potidea channel it is revealed that the water mass exchange under mean wind forcing is of the same order as the one induced by the tidal forcing.
Дисертації з теми "Tidal basins Mathematical models"
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Marchand, Philippe 1972. "Hydrodynamic modeling of shallow basins." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=20274.
Повний текст джерелаАнотація:
A two-dimensional hydrodynamic model is used to simulate the flow field and the concentration distribution of a conservative tracer in shallow basins. A series of numerical test are performed to evaluate different numerical schemes and problems which arise for the use of the Second Moment Method (SMM) in diffusion dominated flows are reported. The results of the basin simulations are compared with experimental data. The model predicts the location and the size of the dead zones, bypassing, recirculation, and local concentrations within the basin. The positioning of the inlet and outlet, and the presence of baffles are important parameters for the location and size of dead zones. The model gives results which are in agreement with the experimental data. The results show that the hydrodynamic model is quite powerful in terms of predicting correctly the residence time distribution for ponds of various dimensions and shapes.
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Stevens, Malcolm William. "A three-dimensional tidal model for shallow waters using transformations and variably spaced grids." Title page, contents and summary only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phs845.pdf.
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Bills, Peter John. "Barotropic depth-averaged and three-dimensional tidal programs for shallow seas /." Title page, contents and summary only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phb599.pdf.
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Steele, Madeline Olena. "Effects of HRU Size on PRMS Performance in 30 Western U.S. Basins." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/654.
Повний текст джерелаАнотація:
Semi-distributed hydrological models are often used for streamflow forecasting, hydrological climate change impact assessments, and other applications. In such models, basins are broken up into hydrologic response units (HRUs), which are assumed to have a relatively homogenous response to precipitation. HRUs are delineated in a variety of ways, and the procedure used may impact model performance. HRU delineation procedures have been researched, but it is still not clear how important these subdivision schemes are or which delineation methods are most effective. To start addressing this knowledge gap, this project investigated whether or not HRU size has a significant effect on streamflow simulation at the mouth of a watershed. To test this, 30 gaged, relatively unimpaired western U.S. basins were each modeled with 6 HRU sets of different sizes using the Precipitation Runoff Modeling System (PRMS). To isolate size as a variable, HRUs were delineated using stream catchments. For each basin, streams were defined with 6 different threshold levels, producing HRUs of differing sizes. Nineteen model parameters were derived for each HRU using nationally consistent GIS datasets, and all other model parameters were left at default values. Climate inputs were derived from a national 4-km2 gridded daily climate dataset. After calibration, 4 goodness-of-fit metrics were calculated for daily streamflow for each HRU set. Uncalibrated model performance was generally poor for a variety of reasons, but comparison of the models was still informative. Results for the 30 basins across the 6 HRU size classes showed that HRU size did not significantly impact model performance across all basins. However, in basins that had less total precipitation and higher elevation, sensitivity of model performance to HRU subdivision levels was slightly greater, though not significantly so. Findings indicate that, in most basins, little subdivision may be required for good model performance, allowing for desirable simplicity and fewer degrees of freedom without sacrificing runoff simulation accuracy.
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Najafi, Hashem Saberi. "Modelling tides in the Persian Gulf using dynamic nesting /." Title page, table of contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phn162.pdf.
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Coutis, Peter F. School of Mathematics UNSW. "Currents, coasts and cays : a study of tidal upwelling and island wakes." Awarded by:University of New South Wales. School of Mathematics, 2000. http://handle.unsw.edu.au/1959.4/18207.
Повний текст джерелаАнотація:
In this thesis, the phenomenon of flow-topography interaction is considered in the context of two dynamically distinct case studies. In the first study, tidally-driven upwelling is investigated usingfield data collected in Hydrographers Passage (20????S), a narrow, navigable channel in the dense outer reef matrix of the southern Great Barrier Reef, Australia. In the second study, island wake formations at Cato Island (155????32????E, 23????15????S) in the deep, Western Coral Sea are examined using a combination of field data and numerical experiments. The result of the Hydrographers Passage study are of considerable scientific interest since they apply to numerous smaller non-navigable reef-edge passages dotted throughout the southern Great Barrier Reef. Strong, semi-diurnal flood tides flowing through a gap in a distal patch reef system at the shelf break generate strong upwelling, providing a pulsed, semi-diurnal input of nutrients to the reefs offshore of the passage. If stable in the long term, this mechanism could have profound evolutionary implications for large reefal areas in the southern Great Barrier Reef. In the second study, two sets of field observations at Cato Island coincided with conditions of strong (~0.7m s-1), vertically sheared incident currents and weaker (~0.3m s-1), more variable incident flows. The combination of dynamically distinct flow regimes and a tall, steep-sided island penetrating oligotrophic surface waters provides a unique opportunity to investigate the impact of island wakes on hydrographic structure and biological enhancement. Field data indicate that flow disturbances downstream of Cato Island are likely to generate biological enhancement during conditions of eddy shedding and non-shedding wakes. A primitive equation numerical model configured on the basis of field observations faithfully reproduces the key features of both data sets; mechanisms responsible for producing these key features are proposed. Previous numerical studies of island wakes have concentrated primarily on eddy shedding flows. In this thesis, the sub-critical (non-shedding) flow scenario is also considered. It is demonstrated that particle retention in island wakes has a ????hair trigger???? characteristic controlled by incident flow speed. This observation leads to a new proposal to explain the long-standing recruitment problem of biological oceanography.
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Matthews, Karyn. "A spherical coordinate tidal model of the Great Australian Bight using a new coastal boundary representation /." Title page, contents and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09phm4391.pdf.
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Dunbar, Donald Stanley 1953. "A numerical model of stratified circulation in a shallow-silled inlet." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25571.
Повний текст джерелаАнотація:
A numerical model has been developed for the study of stratified tidal circulation in Indian Arm - a representative inlet on the southern coast of British Columbia. Equations for horizontal velocity, salt conservation, continuity, density (calculated as a linear function of salinity), and the hydrostatic approximation govern the dynamics. All equations have been laterally integrated under the assumption of negligible cross-inlet variability. The model is time dependent and includes nonlinear advective terms, horizontal and vertical turbulent diffusion of salt and momentum, and variations in width and depth. Provisions for surface wind stress and a flux of fresh water are also included, although neither was utilized in this study. An explicit finite difference scheme centred in both time and space was used to solve for the horizontal and vertical velocity components, salinity, and surface elevation on a staggered rectangular grid. A backward Euler scheme was used to suppress the computational mode. Tests using a semi-implicit scheme to solve the finite difference
equations over realistic topography led to numerical instabilities at modest values of the time step - in spite of the unconditional stability criteria - suggesting that linear stability analysis may give misleading results for strongly nonlinear systems. Surface elevations
calculated from tidal harmonic analysis and salinity timeseries derived from linearly interpolated CTD casts were prescribed at the open boundary.
Initial and boundary conditions based on observations in Burrard Inlet and Indian Arm during the winter of 1974-75 were used to study the inlet's response to tidal forcing and to simulate the deep-water renewal that occurred during this period. Coefficients for the horizontal
turbulent diffusion of momentum and salt were set equal to 10⁶ cm² s⁻¹. Reducing this value by a factor of two was found to have little impact on the solution. A further reduction to 10³ cm² s⁻¹ led to numerical instabilities under conditions of dense water inflow. The side friction term in the momentum balance was tuned to match calculated and observed dissipation rates in Burrard Inlet; leading to good agreement between the observed and calculated barotropic tide. Contour plots of tidal amplitudes and phases for model currents and salinities revealed a standing wave pattern for the K₁ and M₂ internal tides in Indian Arm; thus allowing for the possibility of resonance. A comparison of model results with vertical amplitude and phase profiles from harmonic analysis of Cyclesonde current meter timeseries at two locations in Indian Arm was consistent with this result. A least-squares fit was made of the vertical modal structure in the model to the complex tidal amplitudes. This led to calculations of the kinetic energy contained in each of the modes along the model inlet for the M₂ and K₁ constituents. Most of the energy was found to be contained in the barotropic and first baroclinic modes, with the latter dominating in the deep basin, and the former dominating near the sill. Second mode energy was significant for the K₁ constituent at some locations in Indian Arm. There are clear indications in the model of barotropic tidal energy being radiated into the inlet basin via the internal tide.
Simulations of the influx of dense water into Indian Arm yielded exchange rates that are consistent with observed values and suggest the possibility of fine-tuning the model coefficients to allow prediction of future overturning events.Science, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
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Tumbo, Madaka Harold. "Uncertainties in modelling hydrological responses in gauged and ungauged sub‐basins." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1018568.
Повний текст джерелаАнотація:
The world is undergoing rapid changes and the future is uncertain. The changes are related to modification of the landscape due to human activities, such as large and small scale irrigation, afforestation and changes to the climate system. Understanding and predicting hydrologic change is one of the challenges facing hydrologists today. Part of this understanding can be developed from observed data, however, there often too few observations and those that are available are frequently affected by uncertainties. Hydrological models have become essential tools for understanding historical variations of catchment hydrology and for predicting future possible trends. However, most developing countries are faced with poor spatial distributions of rainfall and evaporation stations that provide the data used to force models, as well as stream flow gauging stations to provide the data for establishing models and for evaluating their success. Hydrological models are faced with a number of challenges which include poor input data (data quality and poorly quantified human activities on observed stream flow data), uncertainties associated with model complexity and structure, the methods used to quantify model parameters, together with the difficulties of understanding hydrological processes at the catchment or subbasin. Within hydrological modelling, there is currently a trend of dealing with equifinality through the evaluation of parameter identifiability and the quantification of uncertainty bands associated with the predictions of the model. Hydrological models should not only focus on reproducing the past behaviour of a basin, but also on evaluating the representativeness of the surface and subsurface model components and their ability to simulate reality for the correct reasons. Part of this modelling process therefore involves quantifying and including all the possible sources of uncertainty. Uncertainty analysis has become the standard approach to most hydrological modelling studies, but has yet to be effectively used in practical water resources assessment. This study applied a hydrological modelling approach for understanding the hydrology of a large Tanzanian drainage basin, the Great Ruaha River that has many areas that are ungauged and where the available data (climate, stream flow and existing water use) are subject to varying degrees of uncertainty. The Great Ruaha River (GRR) is an upstream tributary of the Rufiji River Basin within Tanzania and covers an area of 86 000 km2. The basin is drained by four main tributaries; the Upper Great Ruaha, the Kisigo, the Little Ruaha and the Lukosi. The majority of the runoff is generated from the Chunya escarpment, the Kipengere ranges and the Poroto Mountains. The runoff generated feeds the alluvial and seasonally flooded Usangu plains (including the Ihefu perennial swamp). The majority of the irrigation water use in the basin is located where headwater sub‐basins drain towards the Usangu plains. The overall objective was to establish uncertain but behavioural hydrological models that could be useful for future water resources assessments that are likely to include issues of land use change, changes in patterns of abstraction and water use, as well the possibility of change in future climates.
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Dressler, Kevin Andrew. "Estimating the Spatial Distribution of Snow Water Equivalent and Simulated Snowmelt Runoff Modeling in Headwater Basins of the Semi-arid Southwest." Diss., Tucson, Arizona : University of Arizona, 2005. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1063%5F1%5Fm.pdf&type=application/pdf.
Повний текст джерелаКниги з теми "Tidal basins Mathematical models"
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E, Cartwright David, and Goddard Space Flight Center, eds. Tidal estimation in the Pacific with application to SEASAT altimetry. Greenbelt, Md: National Aeronautics and Space Administration, Goddard Space Flight Center, 1988.
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Ballegooyen, R. C. Van. Dynamics relevant to modelling tidal and subtidal circulation in False Bay. Stellenbosch, South Africa: Marine Pollution Programme, Division of Earth, Marine and Atmospheric Science and Technology, CSIR, 1990.
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Russell, Gary M. Simulation of tidal flow and circulation patterns in the Loxahatchee River Estuary, southeastern Florida. Tallahassee, Fla: Dept. of the Interior, U.S. Geological Survey, 1987.
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Russell, Gary M. Simulation of tidal flow and circulation patterns in the Loxahatchee River Estuary, southeastern Florida. Tallahassee, Fla: Dept. of the Interior, U.S. Geological Survey, 1987.
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Russell, Gary M. Simulation of tidal flow and circulation patterns in the Loxahatchee River Estuary, southeastern Florida. Tallahassee, Fla: Dept. of the Interior, U.S. Geological Survey, 1987.
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Leendertse, Jan J. Influence of the advection term approximation on computed tidal propagation and circulation. Santa Monica, CA: Rand Corporation, 1988.
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Leendertse, Jan J. Nesting of two-dimensional models for tidal flow computations. Santa Monica, CA: Rand Corp., 1990.
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Peng, Jian. An integrated geochemical and hydrodynamic model for tidal coastal environments. Los Angeles, CA: University of Southern California, 2006.
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Burau, Jon R. A vertically averaged spectral model for tidal circulation in estuaries. Sacramento, Calif: Dept. of the Interior, U.S. Geological Survey, 1989.
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Goodwin, Carl R. Simulation of tidal-flow, circulation, and flushing of the Charlotte Harbor estuarine system, Florida. Tallahassee, Fla: U.S. Dept. of the Interior, U.S. Geological Survey, 1996.
Знайти повний текст джерелаЧастини книг з теми "Tidal basins Mathematical models"
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Simon, Bernard. "Tidal Model and Tide Streams." In Mathematical Models, 213–33. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118557853.ch7.
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"Mathematical models of water movement." In Tidal Power, 136–53. Institution of Engineering and Technology, 1991. http://dx.doi.org/10.1049/pben005e_ch9.
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Maftei, Carmen, and Konstantinos Papatheodorou. "Mathematical Models Used for Hydrological Floodplain Modeling." In Civil and Environmental Engineering, 69–100. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-9619-8.ch003.
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There are several methodological approaches to model floodplains. The selection of the appropriate methodology is a matter of the required results and is very dependent on data availability. In fact, data availability is the crucial parameter especially when working in ungauged basins or ephemeral streams. The goal of this chapter is to evaluate methodologies used to floodplain modeling in small watersheds. An overview of the principal models used in floodplain modeling is presented here in terms of their relative advantages as compared to each other. The chapter provides the results obtained with different models applied to a small watershed situated in the Romania and concludes with a discussion about the various recommendations and solutions on flood modeling methodology.
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He, Jie, and Zhizheng Xie. "Engineering Effect Test and Inspection of the Evolution of the Seabed Level near the Artificial Island of the Hong Kong-Zhuhai-Macao Bridge." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220954.
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The Hong Kong-Zhuhai-Macao Bridge is located at the mouth of Lingdingyang Bay. The east and west artificial islands are on both sides of the Lingdingyang Dahao Deep Channel. The waters of the artificial islands are deep and rapid, and the currents impact the artificial islands frontally, which is likely to cause major changes and adjustments in the underwater topography near the artificial islands, eventually forming a new pattern of the local beach evolution centred on the artificial islands. In the engineering design stage of the bridge, the Lingdingyang two-dimensional tidal current and sediment mathematical model was used to simulate the underwater topography near the artificial island of the Hong Kong-Zhuhai-Macao Bridge based on the verification of the measured basic data. The simulated results show that the impact of the artificial island on the water and sand environment of the Lingdingyang waters is concentrated in the waters of 5 km upstream and downstream of the artificial island. The results of the erosion and deposition changes of the underwater topography before and after the construction of the artificial island from 2009 to 2019 show that the trend of the seabed erosion and deposition changes caused by the construction of the artificial island is basically consistent with the prediction results of the mathematical model, which provides good evidence for the applicability of the mathematical model.
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"Geologo-Mathematical Models of Oil and Gas Accumulation in Alpine Mobile Belt Basins." In Fluid Dynamics of Oil and Gas Reservoirs, 483–89. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781118999004.ch9.
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DE VRIEND, HUIB J., and JAN S. RIBBERINK. "MATHEMATICAL MODELING OF MESO-TIDAL BARRIER ISLAND COASTS Part II: PROCESS-BASED SIMULATION MODELS." In Advances in Coastal and Ocean Engineering, 151–97. WORLD SCIENTIFIC, 1996. http://dx.doi.org/10.1142/9789812797575_0004.
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DE VRIEND, HUIB J. "MATHEMATICAL MODELING OF MESO-TIDAL BARRIER ISLAND COASTS Part I: EMPIRICAL AND SEMI-EMPIRICAL MODELS." In Advances in Coastal and Ocean Engineering, 115–49. WORLD SCIENTIFIC, 1996. http://dx.doi.org/10.1142/9789812797575_0003.
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Nolte, David D. "Neurodynamics and Neural Networks." In Introduction to Modern Dynamics, 276–307. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198844624.003.0009.
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Individual neurons are modelled as nonlinear oscillators that rely on bistability and homoclinic orbits to produce spiking potentials. Simplified mathematical models, like the Fitzhugh–Nagumo and NaK models, capture successively more sophisticated behavior of individual neurons, such as thresholds and spiking. Artificial neurons are introduced that are composed of three simple features: summation of inputs, referencing to a threshold, and saturating output. Artificial networks of neurons are defined through specific network architectures that included the perceptron, feedforward networks with hidden layers that are trained using the Delta Rule, and recurrent networks with feedback. A prevalent example of a recurrent network is the Hopfield network, which performs operations such as associative recall. The dynamic trajectories of the Hopfield network have basins of attraction in state space that correspond to stored memories.
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Stewart, Iain, and Christophe Morhange. "Coastal Geomorphology and Sea-Level Change." In The Physical Geography of the Mediterranean. Oxford University Press, 2009. http://dx.doi.org/10.1093/oso/9780199268030.003.0025.
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The intricate shores of the Mediterranean Sea twist and turn for some 46,000 km, with three-quarters of their convoluted length confined to only four countries— Italy, Croatia, Greece, and Turkey. Just over half the coast is rocky, much of it limestone, with the remainder encompassing almost every type of littoral environment (exceptions being coral reefs and mangrove wetlands). Such littoral diversity has long made the seaboard of southern Europe, the Levant, and North Africa a fruitful natural laboratory for studying coastal geomorphology and sea-level change. The virtually enclosed sea ensures that wave processes are generally modest and the tidal range is limited (often less than half a metre), a combination that permits observational evidence of many modern shoreline features to be related precisely to mean sea level. Consequently, relative shifts in the position of now relict coastal features can be used to track the rhythms of relative sea-level change and shoreline evolution. Such rhythms have a bearing on several aspects beyond the physical geography of the Mediterranean basin: they inform archaeological reconstructions of the past settlement and exploitation of a coastal zone that has been an important focus of human activity since Palaeolithic times; they provide testing and fine-tuning for geophysical, geodynamic, and palaeoclimatic models for the region; and they set the backdrop to contemporary societal issues, such as future sea-level rise and coastline adjustments to mass tourism, which threaten the long-term sustainability of the Mediterranean littoral. In this chapter, we review these diverse facets of the Mediterranean coastal realm to provide a synthesis of how these shores have evolved into their present-day appearance. The Mediterranean occupies the convergence zone between two major tectonic plates, Africa and Europe, with a third, Arabia, pressing from the east. Caught within the collisional vice of these great plates are several minor plates and crustal blocks, most notably Anatolia and Apulia. The result is a complex network of plate tectonic structures that define the general configuration of the seaboard. In particular, two major subduction systems partition the Mediterranean basin into a patchwork of minor basins and subsidiary seas (Krijgsman 2002; Chapter 1).
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Koch, Christof. "Phase Space Analysis of Neuronal Excitability." In Biophysics of Computation. Oxford University Press, 1998. http://dx.doi.org/10.1093/oso/9780195104912.003.0013.
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The previous chapter provided a detailed description of the currents underlying the generation and propagation of action potentials in the squid giant axon. The Hodgkin-Huxley (1952d) model captures these events in terms of the dynamical behavior of four variables: the membrane potential and three state variables determining the state of the fast sodium and the delayed potassium conductances. This quantitative, conductance-based formalism reproduces the physiological data remarkably well and has been extremely fertile in terms of providing a mathematical framework for modeling neuronal excitability throughout the animal kingdom (for the current state of the art, see McKenna, Davis, and Zornetzer, 1992; Bower and Beeman, 1998; Koch and Segev, 1998). Collectively, these models express the complex dynamical behaviors observed experimentally, including pulse generation and threshold behavior, adaptation, bursting, bistability, plateau potentials, hysteresis, and many more. However, these models are difficult to construct and require detailed knowledge of the kinetics of the individual ionic currents. The large number of associated activation and inactivation functions and other parameters usually obscures the contributions of particular features (e.g., the activation range of the sodium activation particle) toward the observed dynamic phenomena. Even after many years of experience in recording from neurons or modeling them, it is a dicey business predicting the effect that varying one parameter, say, the amplitude of the calcium-dependent slow potassium current (Chap. 9), has on the overall behavior of the model. This precludes the development of insight and intuition, since the numerical complexity of these models prevents one from understanding which important features in the model are responsible for a particular phenomenon and which are irrelevant. Qualitative models of neuronal excitability, capturing some of the topological aspects of neuronal dynamics but at a much reduced complexity, can be very helpful in this regard, since they highlight the crucial features responsible for a particular behavior. By topological aspects we mean those properties that remain unchanged in spite of quantitative changes in the underlying system. These typically include the existence of stable solutions and their basins of attraction, limit cycles, bistability, and the existence of strange attractors.
Тези доповідей конференцій з теми "Tidal basins Mathematical models"
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Lukyanova, Anna, Anna Lukyanova, Andrei Bagaev, Andrei Bagaev, Vladimir Zalesny, Vladimir Zalesny, Vitaliy Ivanov, and Vitaliy Ivanov. "NUMERICAL SIMULATION OF THE SEMIDIURNAL TIDAL WAVE IMPACT ON THE BLACK SEA CLIMATIC CIRCULATION." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b9439af4c65.49313476.
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The Black Sea is an enclosed deep marine basin, where the structure of tidal movements is dominated by the direct influence of the tidal force on the proper water body. We investigated the spatial structure of its climatic circulation under the impact of tides. We developed a program module extending the numerical general circulation model of the Black Sea which was designed in the Institute of numerical mathematics, Moscow. It allows the lunar semidiurnal harmonics (M_2) influence to be taken into account explicitly via the discrete analogues of the differential equations of motion. Our work reflects the main results of the numerical experiment on the 4x4 km horizontal grid and 40 vertical σ-levels. It was a one-year model run using the CORE atmospheric climatology forcing. We compared the first and the last weeks of simulation and found out that the characteristics of a tidal mode M2 were established at a very short period of time (7 days), which is the estimate of the model’s energy redistribution time scale. The coastal areas where the tidal impact is substantial (~10 cm) were located mainly at the shallow-shelf inlets highly influenced by the climate change. Validation of the cotidal maps showed the reliability of our model at the climatological time scale. In future we will focus on the baroclinic tidal movements and validation with the Marine Hydrophysical Institute database in order to shed new light on physical and ecological processes at the frontal zone along the Rim Current.
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Lukyanova, Anna, Anna Lukyanova, Andrei Bagaev, Andrei Bagaev, Vladimir Zalesny, Vladimir Zalesny, Vitaliy Ivanov, and Vitaliy Ivanov. "NUMERICAL SIMULATION OF THE SEMIDIURNAL TIDAL WAVE IMPACT ON THE BLACK SEA CLIMATIC CIRCULATION." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b4316462ec6.
Повний текст джерелаАнотація:
The Black Sea is an enclosed deep marine basin, where the structure of tidal movements is dominated by the direct influence of the tidal force on the proper water body. We investigated the spatial structure of its climatic circulation under the impact of tides. We developed a program module extending the numerical general circulation model of the Black Sea which was designed in the Institute of numerical mathematics, Moscow. It allows the lunar semidiurnal harmonics (M_2) influence to be taken into account explicitly via the discrete analogues of the differential equations of motion. Our work reflects the main results of the numerical experiment on the 4x4 km horizontal grid and 40 vertical σ-levels. It was a one-year model run using the CORE atmospheric climatology forcing. We compared the first and the last weeks of simulation and found out that the characteristics of a tidal mode M2 were established at a very short period of time (7 days), which is the estimate of the model’s energy redistribution time scale. The coastal areas where the tidal impact is substantial (~10 cm) were located mainly at the shallow-shelf inlets highly influenced by the climate change. Validation of the cotidal maps showed the reliability of our model at the climatological time scale. In future we will focus on the baroclinic tidal movements and validation with the Marine Hydrophysical Institute database in order to shed new light on physical and ecological processes at the frontal zone along the Rim Current.
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Hakimzadeh, Habib. "Numerical Simulation of Oscillatory Shallow-Water Flow Around a Conical Headland Using the K-E and Algebraic Stress Turbulence Models." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-58008.
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Oscillatory shallow-water flows around a headland of conical form have been investigated numerically using the k-ε and algebraic stress closure models of turbulence. The turbulent flow behind the headland was driven by oscillatory current in a tidal basin. Emphasis has been focused on comparing the more sophisticated turbulence models including: the k-ε and algebraic stress models to predict accurately the flow patterns within such tidal basins. The governing equations have been discretized using the finite difference method. The difference equations were then solved using the ADI algorithm. The advective terms in the k-ε equations were treated using the exquisite scheme. As for the experimental results, the numerical model tests have shown that the structure of eddy shedding was dependent on the Keulegan-Carpenter number. The experimental data from the UKCRF were used to check the numerical model results and it was found that both of the closure models of turbulence generally produced reasonable results for the tests considered within the coastal basin.
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Nascimento, Fa´bio, Carlos Levi, Antonio C. Fernandes, Paulo de Tarso Esperanc¸a, and Paulo Sergio Gomes. "A Wave Maker With Active Reflected Wave Compensation System." In ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28222.
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Important aspects in the studies to assess the dynamic behavior of ocean vessels or structures, like ships or offshore oil platforms is the capability of generating gravity waves under strict laboratory control. Model test techniques are continuously improving and are very much dependent on the good quality waves that could be generated in a basin. Since ocean basins have finite dimensions, the waves reflected by the models, walls and even to some extent by the beaches, may become a critical issue if you need to guarantee accuracy and reliability for the tests. Besides the undesirable pattern of reflected waves within the test area of the basin, these waves come back onto the wave maker, affecting the correct properties of the wave to be generated. Modern wave generator apparatuses are now being equipped with real time control systems that enable them to generate an irregular wave pattern. At the same time they correct their flap motions to compensate re-reflection of waves from the wave-boards. The quality of such a system depends very much on the efficiency of the algorithm to be implemented in it. This paper discusses the development of an effective mathematical model of a control system used in an irregular wave maker–hinged flap type, featuring active wave reflection compensation. An efficient real time algorithm has been selected to run the control system device. The system is able to generate first order irregular waves and detect reflected waves that approach the wave maker by means of wave probes mounted on the face of the flap. The probe registers the input data to be used by the actuator to compensate the incoming wave by controlling the flap motion. Computer simulations obtained for a wave-maker in a flume are used to demonstrate the efficiency of each step of the theory and the overall accuracy of the compensation system.
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Shekman, E. A. "ДИФФЕРЕНЦИРОВАННЫЙ УЧЕТ ГЕОМОРФОЛОГИЧЕСКИХ УСЛОВИЙ ВОДОСБОРНОГО БАССЕЙНА С ИСПОЛЬЗОВАНИЕМ ПОРЯДКОВЫХ ХАРАКТЕРИСТИК ВОДОРАЗДЕЛОВ". У GEOGRAFICHESKIE I GEOEKOLOGICHESKIE ISSLEDOVANIIA NA DAL`NEM VOSTOKE. ИП Мироманова Ирина Витальевна, 2019. http://dx.doi.org/10.35735/tig.2019.90.64.014.
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Флагманом современной географии выступает моделирование географических систем и процессов их функционирования, базирующееся на огромных базах данных и алгоритмах многомерного компьютерного моделирования поведения сложных многосвязных систем. Сам процесс моделирования базируется на мощном аппарате математического анализа и статистической обработки базовых параметров объектов, на основе которых производится построение имитационных моделей их функционирования и развития. Речной бассейн является самым распространенным на поверхности суши природным объектом, обладающий отчетливо выраженными границами, структурной организацией, иерархией, относительной замкнутостью потоков вещества и энергии. При описании структуры водосборного бассейна речной системы традиционно применяются порядковые классификации. Порядковая классификация водотоков базируется на основополагающем свойстве речных потоков образовывать при последовательном слиянии древовидную структуру со ступенчатым нарастанием основных параметров системы. Стабильность структуры при этом поддерживается непрерывной деятельностью мощных потоков вещества и энергии. Широкое применение получила нисходящая порядковая классификация Р. Хортона 7, в основу которой легло положение о том, что неразветвленные элементарные водотоки сходны в разных условиях и должны иметь наименьший 1й порядок, образуя при слиянии водоток 2го порядка, в то время как водотоки 2го порядка образуют водоток 3го порядка и т. д. Также Хортоном, на основе анализа структуры речных сетей и их бассейнов были предложены законы соотношения основных характеристик водотоков разных порядков. Позднее порядковая классификация Хортона была доработана Стралером 6, который исключил понятие главной реки , которая на всем своем протяжении имеет максимальный порядок, хотя структурно состоит из множества разнопорядковых сегментов. Данные классификации сейчас принято рассматривать в едином контексте как классификацию ХортонаСтралера. Еще в XIX веке был высказан тезис о том, что водоразделы и тальвеги являются главными структурными линиями рельефа и находятся в тесной взаимосвязи 2, определяя распределение потоков вещества и энергии в водосборном бассейне. С использованием классификации водотоков ХортонаСтралера предложен принцип классификации водоразделов. На основе авторской методики обработки цифровых моделей рельефа (ЦМР) с использованием инструментов ГИС было апробировано использование порядковых характеристик водоразделов для получения детальной информации о вариациях основных характеристик однопорядковых элементов речной сети в зависимости от порядка водораздела в пределах бассейна реки Уссури.The flagship of modern geography is the modeling of geographical systems and the processes of their functioning, based on huge databases and algorithms for multidimensional computer modeling of the behavior of complex multiply connected systems. The modeling process itself is based on a powerful apparatus for mathematical analysis and statistical processing of the basic parameters of objects, based on which simulation models of their functioning and development are built. The river basin is the most widespread natural object on the land surface, which has distinct boundaries, structural organization, hierarchy, and relative isolation of matter and energy flows. In describing the structure of the catchment of a river system, ordinal classifications are traditionally applied. The ordinal classification of watercourses is based on the fundamental property of river flows to form a tree structure with successive merging with a stepwise increase in the main parameters of the system. The stability of the structure is supported by the continuous activity of powerful flows of matter and energy. The descending ordinal classification of R. Horton 7 was widely used, which was based on the proposition that unbranched elementary watercourses are similar under different conditions and should have the smallest 1st order, forming second order watercourses at the time how 2nd order watercourses form a 3rd order watercourse, etc. Also, Horton, based on an analysis of the structure of river networks and their basins, proposed the laws of correlation of the main characteristics of watercourses of different orders. Later, the Horton ordinal classification was finalized by A. Straler 6, who excluded the concept of the main river, which along its entire length has the maximum order, although it structurally consists of many differentorder segments. Classification data is now considered to be considered in a single context as the HortonStrahler classification. As early as the 19th century, the thesis was expressed that watersheds and thalwegs are the main structural lines of the relief and are closely interconnected 2, determining the distribution of matter and energy flows in the catchment. Using the classification of HortonStrahler watercourses, the principle of the classification of watersheds is proposed. Based on the authors methodology for processing digital elevation models (DEM) using GIS tools, the use of ordinal characteristics of watersheds was tested to obtain detailed information on variations of the main characteristics of singleorder elements of the river network depending on the order of the watershed within the Ussuri River Basin.