Статті в журналах: "Qualityof hydrodynamics"

1

Huang, Mutao, and Yong Tian. "An Integrated Graphic Modeling System for Three-Dimensional Hydrodynamic and Water Quality Simulation in Lakes." ISPRS International Journal of Geo-Information 8, no. 1 (January 9, 2019): 18. http://dx.doi.org/10.3390/ijgi8010018.

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Understanding the complex hydrodynamics and transport processes are of primary importance to alleviate and control the eutrophication problem in lakes. Numerical models are used to simulate these processes. However, it is often difficult to perform such a numerical modeling simulation for common users. This study presented an integrated graphic modeling system designed for three-dimensional hydrodynamic and water quality simulation in lakes. The system, called the Lake Modeling System (LMS), provides necessary functionalities streamlined for hydrodynamic modeling. The LMS provides a geographic information system (GIS)-based data processing framework to establish a model and provides capabilities for displaying model input and output information. The LMS also provides mapping and visualization tools to support the model development process. All of these features in a GIS-based framework makes the task of complex hydrodynamic and water quality modeling easier. The applicability of the LMS is demonstrated by a case study in Lake Donghu, which is a large urban lake in the middle reaches of the Yangtze River in China. The LMS was utilized to setup and calibrate a model for Lake Donghu. Then the model was used to study the effects of a water diversion project on the change in hydrodynamics and the water quality.

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2

Liu, Bojun, Jun Xia, Libin Yang, Changyong Cui, Linwei Wang, and Tiansheng Li. "Improved dynamic simulation technique for hydrodynamics and water quality of river-connected lakes." Water Supply 20, no. 8 (June 15, 2020): 3752–67. http://dx.doi.org/10.2166/ws.2020.125.

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Abstract In this study, a two-dimensional hydrodynamic water-quality model is proposed for river-connected lakes in an effort to improve calibration accuracy and reduce computational burden. To achieve this, the sensitivity of parameters involved in the hydrodynamic model is analyzed using stepwise rank regression and Latin hypercube sampling (LHS), and the roughness coefficient, wind drag coefficient and wind resistance coefficient are identified as the most important parameters affecting the hydrodynamics of the Hongze Lake. Then, the ensemble Kalman filter (EnKF) is used to assimilate observations to the proposed hydrodynamic and water quality model. It is found that assimilation of both state variables and model parameters results in a significant improvement of the simulation of the water level, flow velocity and pollutant concentration in the Hongze Lake.

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3

Cunha, Cynara De Lourdes da Nobrega, Gabriela Pacheco Corrêa, and Paulo Cesar Colonna Rosman. "A coupled model of hydrodynamics circulation and water quality applied to the Rio Verde reservoir, Brazil." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 13, no. 6 (October 31, 2018): 1. http://dx.doi.org/10.4136/ambi-agua.2244.

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This work applied the coupled horizontal two-dimensional hydrodynamic circulation model (2DH) and the vertically integrated water quality model for non-conservative and passive scalars to the Rio Verde reservoir in the state of Paraná, Brazil, to simulate flow, temperature and water quality parameters. The water quality model uses the same spatial grid applied for the hydrodynamics model. Flow velocities and turbulence coefficients previously defined in the hydrodynamics model can be used directly in the water quality model. Modeling results were compared to field data for a period of 308 days, from February 27th 2010 and December 31th 2010. Field data included water and air temperature, wind, relative humidity, radiation, discharges and concentration values of some substances in the tributaries of the reservoir. The results indicated that hydrodynamic circulation and, consequently, horizontal transport, are strongly dependent on the wind. Inflows/outflows generated a localized circulation. The results for the temperature and dissolved oxygen concentration were compared with field measures and a satisfactory consistency was achieved. Despite the errors associated with boundary conditions, the models demonstrated their potential to adequately simulate the data set collected from the reservoir.

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4

Vijay, R., P. J. Khobragade, and R. A. Sohony. "Water quality simulation of sewage impacts on the west coast of Mumbai, India." Water Science and Technology 62, no. 2 (July 1, 2010): 279–87. http://dx.doi.org/10.2166/wst.2010.237.

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Most coastal cities use the ocean as a site of waste disposal where pollutant loading degrades the quality of coastal waters. Presently, the west coast of Mumbai receives partially treated effluent from wastewater treatment facilities through ocean outfalls and discharges into creeks as well as wastewater/sewage from various open drains and nallahs which affect the water quality of creek and coastal water. Therefore, the objective of this paper is to simulate and assess the hydrodynamic behaviour and water quality due to impact of sewage and wastewater discharges from the west coast of Mumbai. Hydrodynamics and water quality were simulated based on present conditions and validated by using measured tide, current data and observed DO, BOD and FC. Observed and simulated results indicated non compliance to standards in Malad, Mahim creeks and the impact zones of ocean outfalls. The developed model could be used for generating various conditions of hydrodynamics and water quality considering the improvement in wastewater collection systems, treatment levels and proper disposal for proper planning and management of creeks and coastal environment.

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5

Lindenschmidt, Karl-Erich, Jan Rauberg, and Fred B. Hesser. "Extending Uncertainty Analysis of a Hydrodynamic-Water Quality Modelling System using High Level Architecture (HLA)." Water Quality Research Journal 40, no. 1 (February 1, 2005): 59–70. http://dx.doi.org/10.2166/wqrj.2005.005.

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Abstract This paper illustrates the coupling of water quality model components in High Level Architecture (HLA), a computer architecture for constructing distributed simulations. HLA facilitates interoperability among different simulations and simulation types and promotes reuse of simulation software modules. It was originally developed for military applications but the platform is finding increasing applicability for civilian purposes. The models from the Water Quality Analysis Simulation Program (WASP5) were implemented in HLA to extend its Monte Carlo uncertainty analysis capabilities. The models include DYNHYD (hydrodynamics), EUTRO (phytoplankton and nutrient dynamics) and TOXI (sediment and micropollutant transport). The uncertainty analysis investigated the impact of errors in the hydrodynamic parameters (weir discharge and roughness coefficients) and boundary conditions (upstream and tributary discharge) on the uncertainty in the water quality output variables. It was found that the contribution of the hydrodynamic parameter error to the water quality output uncertainty is comparable to that obtained from the error in the water quality parameters. The error in the boundary condition input data is also an important contributor to model uncertainty.

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6

Gao, Xueping, Shiyao Zhang, Bowen Sun, Na Li, Yongpeng Liu, and Yan Wang. "Assessing the Effects of Restoration Measures on Water Quality in a Large Shallow Reservoir." Sustainability 11, no. 19 (September 27, 2019): 5347. http://dx.doi.org/10.3390/su11195347.

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Large shallow reservoirs control flooding, supply water, and protect the ecological environment, which are vital functions for societal development. As the largest artificial plain reservoir in China, Suyahu Reservoir is suffering from significant sedimentation and water quality deterioration in recent years. A three-dimensional (3-D) hydrodynamic and water quality model was developed based on the Environmental Fluid Dynamic Code (EFDC). The model was applied to seven scenarios for evaluating the response of in-reservoir hydrodynamics and water quality to the restoration measures, including expansion and sediment dredging project, external load reduction, and inflow regulation. The results show that: (1) the expansion and sediment dredging project has no notable improvement on the water quality of the reservoir; (2) the external load reduction can significantly improve the water quality of the reservoir; and (3) the optimal inflow condition occurred when the flows of Ru River’s two inlets were evenly distributed, and the hydrodynamics and water quality were best improved. Moreover, the increasing water exchange rate could not cause the same water quality improvement, showing that it may be unreliable to evaluate the effects of restoration measures using a single indicator. This study can provide useful information for developing and implementing effective restoration measures in large shallow reservoirs.

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7

Beven, Keith. "Hydrodynamics and Water Quality." Journal of Environmental Quality 37, no. 5 (September 2008): 1996. http://dx.doi.org/10.2134/jeq2008.0011br.

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8

Rojano, Fernando, David Huber, Ifeoma Ugwuanyi, Vadesse Noundou, Andrielle Kemajou-Tchamba, and Jesus Chavarria-Palma. "Net Ecosystem Production of a River Relying on Hydrology, Hydrodynamics and Water Quality Monitoring Stations." Water 12, no. 3 (March 12, 2020): 783. http://dx.doi.org/10.3390/w12030783.

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Flow and water quality of rivers are highly dynamic. Water quantity and quality are subjected to simultaneous physical, chemical and biological processes making it difficult to accurately assess lotic ecosystems. Our study investigated net ecosystem production (NEP) relying on high-frequency data of hydrology, hydrodynamics and water quality. The Kanawha River, West Virginia was investigated along 52.8 km to estimate NEP. Water quality data were collected along the river using three distributed multiprobe sondes that measured water temperature, dissolved oxygen, dissolved oxygen saturation, specific conductance, turbidity and ORP hourly for 71 days. Flows along the river were predicted by means of the hydrologic and hydrodynamic models in Hydrologic Simulation Program in Fortran (HSPF). It was found that urban local inflows were correlated with NEP. However, under hypoxic conditions, local inflows were correlated with specific conductance. Thus, our approach represents an effort for the systematic integration of data derived from models and field measurements with the aim of providing an improved assessment of lotic ecosystems.

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9

Farahmandpour, Omolbanin, Abdul Kadir Marsono, Parham Forouzani, Masine Md. Tap, and Suhaimi Abu Bakar. "Experimental simulation of tsunami surge and its interaction with coastal structure." International Journal of Protective Structures 11, no. 2 (September 16, 2019): 258–80. http://dx.doi.org/10.1177/2041419619874082.

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Following the tsunamis occurred in Japan (2011) and Indian Ocean (2004), investigating interaction between coastal structures and tsunamis became necessary. Although several attempts have been made to estimate the tsunami forces acting on the coastal structures, there still remain inconsistencies among the published design guidelines. This research includes an experimental study to investigate the interaction between a tsunami surge and a coastal structure. The tsunami surge was generated using a novel dam-break system, capable of generating higher tsunami surges than the previous simulations. The relations between surge velocity, surge depth, and surge-induced pressure on the structure were presented. In the surge-induced pressure–time histories, there were three identified force components, namely, run-up, impulsive and quasi-steady hydrodynamics. Furthermore, this research presents a comparison made between the experimental results and existing tsunami guidelines. The ratio of impulsive force to hydrodynamic force was found around 2.4 for each tsunami surge. The hydrodynamic forces were found to be higher with respect to those determined using the ‘Federal Emergency Management Agency’ FEMA P646 guidelines, whereas they were approximately in agreement with those obtained by FEMA 55. Moreover, the results showed that the ‘Structural Design Method of Building for Tsunami Resistance’ overestimates the impulsive force.

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10

Ueta, Shoji, Natsuki Hosono, Ryusuke Kuroki, and Yosuke Yamashiki. "Numerical Simulation Study of Debris Particles Movement Characteristics by Smoothed Particle Hydrodynamics." Journal of Disaster Research 17, no. 2 (February 1, 2022): 237–45. http://dx.doi.org/10.20965/jdr.2022.p0237.

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Debris flow is an important natural hazard in mountain zone because it can threaten human lives with very little warning. Since laboratory experiments on debris flows at real scale are difficult to perform, numerical simulations are important in evaluating the impact of such flows. Among several candidate models, the smoothed particle hydrodynamics (SPH) is a particular attractive numerical method for this purpose. SPH is a particle-based numerical hydrodynamic method originally developed in the astrophysical field before extension to elastic bodies. Several works have already tested the applicability of SPH to debris flow, despite there are only few detailed validations. In this report, thus, we aimed to check the applicability of SPH to debris flows. Since the accurate treatment of the elastic bodies tends to be computationally expensive, we have developed a massively parallel SPH code. A comparison between laboratory experiments and numerical simulations using SPH showed qualitatively similar features, though there are differences in quantitive comparisons.

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11

Hatfield, F. J., and D. C. Wiggert. "Water Hammer Response of Flexible Piping by Component Synthesis." Journal of Pressure Vessel Technology 113, no. 1 (February 1, 1991): 115–19. http://dx.doi.org/10.1115/1.2928721.

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Water hammer pressure in piping is modified by the consequent motion of the piping. In general, accurate estimates of dynamic pressure and pipe displacement must account for this interaction. One approach is to formulate and solve the coupled equations of motion for the liquid and pipe structure. Implementation for practical pipe systems would require a computer code comparable in scope to a structural finite element program combined with a hydrodynamics program. This paper presents an alternative approach that utilizes any available finite element program to compute natural frequencies and mode shapes of the piping, and then uses those modes to modify a hydrodynamic analysis and to predict motion of the piping. An example analysis demonstrates application of the method to assess the consequence of removing a brace intended to restrain pipe motion caused by water hammer. Results are compared to those given by analyses that neglect the effect of pipe motion on pressure.

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12

Souza, Luany Jaine de Araújo, José da Costa Felix Neto, Rafael Neri Furtado, Helenilza Ferreira Albuquerque Cunha, Marcos Tavares Dias, and Alan Cavalcanti da Cunha. "Qualidade da Água e Hidrodinâmica como Parâmetros Ambientais na Piscicultura de Tanques-Rede no Estuário do Rio Amazonas." Revista Brasileira de Geografia Física 14, no. 4 (2021): 2338–51. http://dx.doi.org/10.26848/rbgf.v14.4.p2338-2351.

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The cultivation of fish in net cages is an activity sensitive to environmental pollution, but also has the ability to cause environmental impact. The aim of study was to investigate spatial-temporal variations of physico-chemical and microbiological parameters of water quality (WQ) in a stretch of the Matapi River, State of Amapá/Brazil. This study presents an environmental analysis of fish culture on net cages systems, specially hydrodynamic and WQ condictions. Three sampling sites were distributed in ≈15 km of river to quantify variations of the WQ and hydrodynamic parameters. We notice a significant hydrodynamic seasonal influence of the WQ (p <0.05), which presented reduced spatial influence (p>0.05). We observed that both the hydrological-seasonal condictions, tide phase and site localization, explain the variation of WQ in these floodplans area (p<0.05, ANCOVA). We conclude that net cage system presented low environmental impact but local viability, both dependent on hydrodynamic conditions and scale studied.

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13

Ban, Jingya, Bing Ling, Wei Huang, Xiaobo Liu, Wenqi Peng, and Jianmin Zhang. "Spatiotemporal Variations in Water Flow and Quality in the Sanyang Wetland, China: Implications for Environmental Restoration." Sustainability 13, no. 9 (April 21, 2021): 4637. http://dx.doi.org/10.3390/su13094637.

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Spatiotemporal modeling of wetland environments’ hydrodynamics and water quality characteristics is key to understanding and managing these ecologically important areas’ physical and environmental properties. We developed a two-dimensional numerical model based on the MIKE 21 module to analyze flow and pollution dynamics in the island-dominated Sanyang wetland of eastern China. Three simulation periods representing annual precipitation cycles were used to model freshwater discharge and water quality in the wetland. The results showed that the flow velocity in the study area had hydrodynamic characteristics typical of such a setting, with an average monthly flow velocity ranging from 0.01 to 0.04 m/s, contributing to an increased risk of serious eutrophication. The water quality problems (represented by ammonia nitrogen, NH3-N, and total phosphorus, TP, levels) peaked during the early summer peak rain season, followed by a gradual decline during a later flood period and the lowest values during the fall/winter dry period. Moreover, the spatial distribution of NH3-N and TP levels decreased from northwest to east, reflecting the influence of a highly polluted source. Our results provide a useful context for restoration efforts in the Sanyang wetland and other similar areas.

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14

Riduan, Rony, Riza Miftahul Khair, Lovina Gianina, and M. Istiqlal Hasibuan. "One-Way Flow System Water Quality Modelling of Terantang Reclamation Channel." IOP Conference Series: Earth and Environmental Science 999, no. 1 (March 1, 2022): 012019. http://dx.doi.org/10.1088/1755-1315/999/1/012019.

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Abstract The implementation of reclamation process in wetland has encountered some obstacles, such as the occurrence of pyrite oxidation, sedimentation, and accumulation of toxic materials, especially the concentration of Fe (iron) in the channel. The condition of the reclamation channel which is influenced by tidal events and environmental factors causes the dynamics of Fe concentration to be strongly influenced by hydrodynamic aspects and its interaction with dissolved and suspended particulates. An accurate model will be useful as a tool to evaluate alternative management of water systems to overcome the problem of Fe concentration accumulation in the tidal wetland reclamation channel. Fe fate and transport were modeled using a numerical model of hydrodynamics and water quality EFDC (Environmental Fluid Dynamic Code). The partition process separates the metal fraction into two phases (dissolved and solid), which is related to the value of the partition coefficient (Kp). The application of the partition process is considered to have a significant influence on the accuracy of the estimated Fe concentration. The simulation results of the model with the partition coefficient approach have better accuracy than the conventional model which tends to be over-predicted compared to the observation data. Simulation of one-way flow system shows a decrease of Fe concentration in the channel by an average of 52.9% compared to two-ways flow system. The application of one-way flow system is possible through the placement of flap gates that will direct the flow to the drainage channels.

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15

Zebaze, Arnaud Tonang, Adoua Kopa Njueya, Maurice Kwekam, and Emile Temgoua. "Assessment of Hydrogeoelectrical Characteristics of Crystalline Aquifers and Groundwaters Quality in Adamawa Plateau: Case of Mbakaou (Adamawa - Cameroon)." Environmental and Earth Sciences Research Journal 7, no. 4 (December 31, 2020): 153–63. http://dx.doi.org/10.18280/eesrj.070405.

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Population in Adamawa Plateau faced to borehole failure and return to alternative water supply structures (wells and catchments) with a doubtful quality. This study was carried out to highlight the location of aquifers, their hydrodynamics characteristics and groundwaters quality in Mbakaou locality, which belong to the Adamawa Region. Combination of geological and geoelectrical surveys at 10 stations, with hydrodynamic study of 4 boreholes were carried out to characterize aquifers. Hydrochemical analysis of 10 waters samples has been done to determine physico-chemical water quality and origin of waters mineralization. Geological studies show that basement rocks, which constitute fractured aquifers, consists of a large assemblage of granitoid. Geophysics and drilling data highlight superficial aquifers located between 2 and 17 m and fractured aquifers located between 11 and 74 m, with resistivity ranging from 50 to 671 Ω.m. The borehole have yield varying between 2.80 and 5.14 m3/h. Transmissivity and permeability ranging from 10-6 to 10-5 m2/s and 10-7 to 10-6 m/s respectively, indicating that aquifers are semi-permeable. Waters are of good quality compared to WHO norms and weakly mineralized (35 to 247.9 mg/l). Piper diagram show that calcium and magnesium bicarbonate facies is dominant. Mineralisation of water is mainly influenced by water-rock interaction through silicate weathering.

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16

Rao, Yerubandi R., J. E. Milne, and C. H. Marvin. "Hydrodynamics and water quality in western Lake Ontario." Journal of Great Lakes Research 38 (January 2012): 91–98. http://dx.doi.org/10.1016/j.jglr.2012.04.001.

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17

Santhakumar, M., T. Asokan, and T. R. Sreeram. "Analysis of Parameter Sensitivity Using Robust Design Techniques for a Flatfish Type Autonomous Underwater Vehicle." International Journal of Quality, Statistics, and Reliability 2009 (January 20, 2009): 1–10. http://dx.doi.org/10.1155/2009/670340.

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Hydrodynamic parameters play a major role in the dynamics and control of Autonomous Underwater Vehicles (AUVs). The performance of an AUV is dependent on the parameter variations and a proper understanding of these parametric influences is essential for the design, modeling, and control of high-performance AUVs. In this paper, the sensitivity of hydrodynamic parameters on the control of a flatfish type AUV is analyzed using robust design techniques such as Taguchi's design method and statistical analysis tools such as Pareto-ANOVA. Since the pitch angle of an AUV is one of the crucial variables in the control applications, the sensitivity analysis of pitch angle variation is studied here. Eight prominent hydrodynamic coefficients are considered in the analysis. The results show that there are two critical hydrodynamic parameters, that is, hydrodynamic force and hydrodynamic pitching moment in the heave direction that influence the performance of a flatfish type AUV. A near-optimal combination of the parameters was identified and the simulation results have shown the effectiveness of the method in reducing the pitch error. These findings are significant for the design modifications as well as controller design of AUVs.

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18

Yeh, Harry, Elena Tolkova, David Jay, Stefan Talke, and Hermann Fritz. "Tsunami Hydrodynamics in the Columbia River." Journal of Disaster Research 7, no. 5 (October 1, 2012): 604–8. http://dx.doi.org/10.20965/jdr.2012.p0604.

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On 11 March 2011, the Tohoku Tsunami overtopped a weir and penetrated 49 km up the Kitakami River, the fourth largest river in Japan [1]. Similarly, the 2010 Chile tsunami propagated at least 15 km up the Maule River [2]. In the Pacific Northwest of the United States, large tsunamis have occurred along the Cascadia subduction zone, most recently the ‘orphan tsunami’ of 1700 (Atwater et al. [3]). The expected future occurrence of a Cascadia tsunami and its penetration into the Lower Columbia River became the subject of “the Workshop on Tsunami Hydrodynamics in a Large River” held in Corvallis, Oregon, 2011. We found that tsunami penetration into the Columbia River is quite different from a typical river. The tsunami enters the vast river estuary through the relatively narrow river mouth of the Columbia, which damps and diffuses its energy. The tsunami transforms into a long period, small amplitude wave that advances to Portland, 173 km from the ocean. Understanding this unique tsunami behavior is important for preparing a forthcoming Cascadia tsunami event.

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19

Ristenpart, E., and D. Wittenberg. "Hydrodynamic Water Quality Simulation - An Approximative Solution." Water Science and Technology 24, no. 6 (September 1, 1991): 157–63. http://dx.doi.org/10.2166/wst.1991.0152.

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Impacts from combined sewer systems on receiving waters are heavily polluting a lot of small river ecosystems. A simulation model which can be used to predict the development of water quality after combined sewer overflows and other impacts from the urban drainage system has been developed. This model works with hydrodynamic flow calculation because it is applied in a system of small wetland creeks with nonstationary flow conditions. The numerical solution of the differential equations is described as well as calibration results. It is shown that water quality simulation based on the one-dimensional mass transport equation is possible for nonstationary flow conditions and is going to become very useful in urban drainage planning.

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20

Rajar, Rudi, and Matjaz Cetina. "Hydrodynamic and water quality modelling: An experience." Ecological Modelling 101, no. 2-3 (August 1997): 195–207. http://dx.doi.org/10.1016/s0304-3800(97)00047-1.

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Rajar, Rudi, Matjaz Cetina, and Andrej Sirca. "Hydrodynamic and water quality modelling: case studies." Ecological Modelling 101, no. 2-3 (August 1997): 209–28. http://dx.doi.org/10.1016/s0304-3800(97)00052-5.

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22

Rao, J. S. "Quality Factors of Rotors With Hydrodynamic Bearings." Journal of Engineering for Gas Turbines and Power 115, no. 2 (April 1, 1993): 261–65. http://dx.doi.org/10.1115/1.2906703.

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The quality factor of a system is a measure of the maximum amplitude of vibration that occurs at resonance when the frequency of excitation is equal to the undamped natural frequency. This factor can be easily determined for a given mode of vibration, given its equivalent viscous damping ratio, as Q = 1/2ξ. Such a definition becomes complicated for a rotor mounted on hydrodynamic bearings. This note discusses some factors involved in estimating the quality factor of a rotor.

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23

Gaines, W. A., B. R. Kim, A. R. Drews, C. Bailey, and T. Loch. "Controlling Cooling Water Quality by Hydrodynamic Cavitation." Proceedings of the Water Environment Federation 2007, no. 7 (October 1, 2007): 538–45. http://dx.doi.org/10.2175/193864707787781656.

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24

Cunha, Cynara de L. da N., Paulo C. C. Rosman, Aldo Pacheco Ferreira, and Teófilo Carlos do Nascimento Monteiro. "Hydrodynamics and water quality models applied to Sepetiba Bay." Continental Shelf Research 26, no. 16 (October 2006): 1940–53. http://dx.doi.org/10.1016/j.csr.2006.06.010.

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Opdyke, Daniel. "Hydrodynamics and Water Quality: Modeling Rivers, Lakes, and Estuaries." Eos, Transactions American Geophysical Union 89, no. 39 (September 23, 2008): 366. http://dx.doi.org/10.1029/2008eo390008.

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26

Gordillo, Geovanny, Mario Morales-Hernández, and Pilar García-Navarro. "Finite volume model for the simulation of 1D unsteady river flow and water quality based on the WASP." Journal of Hydroinformatics 22, no. 2 (November 15, 2019): 327–45. http://dx.doi.org/10.2166/hydro.2019.080.

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Abstract In this work, a one-dimensional (1D) finite volume numerical model for the unsteady simulation of the flow hydrodynamics and water quality is developed. The water dynamics is formulated with the 1D shallow water equations, and the water quality evolution is described by the Water Quality Analysis Simulation Program (WASP) model, allowing us to interpret and predict the transport and fate of various biochemical substances along any river reach. This combined system is solved with an explicit finite volume scheme based on Roe's linearization for the advection component of both the flow and the solute transport equations. The proposed model is able to consider temporal variations in tributaries and abstractions occurring in the river basin. This feature is transcendent in order to predict the chemical composition of natural water bodies during winter and summer periods, leading to an improvement in the agreement between computed and observed water quality evolutions. The combined model has been evaluated using literature tests in a steady state and a real-field case of the Ebro river (Spain), characterized by a marked unsteady regime. In the real case, we found that the water temperature was very sensitive to both the solar radiation and the average air temperature, requiring a careful calibration of these parameters. The numerical results are also demonstrated to be reasonably accurate, conservative and robust in real-scale field cases, showing that the model is able to predict the evolution of quality parameters as well as hydrodynamic variables in complex scenarios.

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Zhu, Changjun, Qinag Liang, Feng Yan, and Wenlong Hao. "Reduction of Waste Water in Erhai Lake Based on MIKE21 Hydrodynamic and Water Quality Model." Scientific World Journal 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/958506.

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In order to study the ecological water environment in Erhai Lake, different monitoring sections were set to research the change of hydrodynamics and water quality. According to the measured data, MIKE21 Ecolab, the water quality simulation software developed by DHI, is applied to simulate the water quality in Erhai Lake. The hydrodynamics model coupled with water quality is established by MIKE21FM software to simulate the current situation of Erhai Lake. Then through the comparison with the monitoring data, the model parameters are calibrated and the simulation results are verified. Based on this, water quality is simulated by the two-dimensional hydrodynamics and water quality coupled model. The results indicate that the level of water quality in the north and south of lake is level III, while in the center of lake, the water quality is level II. Finally, the water environment capacity and total emmision reduction of pollutants are filtered to give some guidance for the water resources management and effective utilization in the Erhai Lake.

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Bennett, William George, and Harshinie Karunarathna. "Coastal flood alleviation through management interventions under changing climate conditions." International Journal of Disaster Resilience in the Built Environment 11, no. 2 (November 16, 2019): 187–203. http://dx.doi.org/10.1108/ijdrbe-07-2019-0042.

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Purpose Coastal flooding has disastrous consequences on people, infrastructure, properties and the environment. Increasing flood risk as a result of global climate change is a significant concern both within the UK and globally. To counter any potential increase in future flooding, a range of potential management options are being considered. This study aims to explore future coastal management practice for flood alleviation, incorporating the influence of climate change. Design/methodology/approach The Taf estuary in South West Wales, a macro-tidal estuary which has a history of coastal flooding, was chosen as the case study in this paper to investigate the impact of coastal management interventions such as construction of hard defences, managed realignment or altering land use of affiliated ecosystems such as salt marshes on the complex hydrodynamics and hence flooding of the surrounding areas of the estuary. The study was carried out using a numerical hydrodynamic model of the Taf estuary, developed using the process-based Delft3D modelling software. Findings The role of the selected management interventions on coastal flooding was investigated using an extreme storm condition, both with and without the impact of future sea level rise. The results highlight the scale of the effect of sea level rise, with the selected management interventions revealing that minimising the increase in flooding in future requires careful consideration of the available options. Originality/value This paper explores the highlighted role of coastal management practice in future with the influence of climate change to study how effective alternative methods can be for flood alleviation.

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Hannoun, Imad A., and Paul F. Boulos. "Optimizing distribution storage water quality: A hydrodynamic approach." Applied Mathematical Modelling 21, no. 8 (August 1997): 495–502. http://dx.doi.org/10.1016/s0307-904x(97)00043-7.

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30

Burstein, Leonid. "Surfaces with size different pores: hydrodynamic lubrication quality." Industrial Lubrication and Tribology 70, no. 7 (September 10, 2018): 1234–42. http://dx.doi.org/10.1108/ilt-12-2017-0390.

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31

Tillman, Pei, Jonathan Dixon, Yue-Cong Wang, and Merran Griffith. "HYDRODYNAMIC AND WATER QUALITY MODELLING IN SYDNEY HARBOUR." Coastal Engineering Proceedings, no. 36v (December 31, 2020): 58. http://dx.doi.org/10.9753/icce.v36v.papers.58.

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The Sydney Harbour waterway modelling suite examines the changes in water quality in the harbour estuary and its tributaries associated with stormwater runoff and wet weather sewage overflows from the upstream catchments, in Sydney Australia. This paper discusses the development and performance of the numerical models. The models have been used to investigate the spatial variability of catchment pollutant loads and the impacts of sewer overflows on the water quality in the Sydney Harbour estuary. The scenario modelling results demonstrate that sewer overflows have a minimal impact on the Sydney Harbour estuary water quality, with stormwater dominating most changes in water quality.

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Kaçıkoç, Meltem, and Mehmet Beyhan. "Hydrodynamic and Water Quality Modeling of Lake Eğirdir." CLEAN - Soil, Air, Water 42, no. 11 (April 16, 2014): 1573–82. http://dx.doi.org/10.1002/clen.201300455.

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Bondar, Denis V., Vladimir V. Zholobov та Oleg S. Nadezhkin. "Метод определения параметров утечек в трубопроводах на основе гидродинамических моделей". SCIENCE & TECHNOLOGIES OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION, № 5 (9 грудня 2021): 515–27. http://dx.doi.org/10.28999/2541-9595-2021-11-5-515-527.

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It is known that on the basis of the pipeline non-stationary hydrodynamic model after identification of parameters included in it, it is possible to adequately reproduce the full-scale hydraulic characteristics of transported medium flow by resolving the primal problem of hydraulics, in particular, the primal problem of identifying leakage parameters. The numerical solution of the inverse problem, in contrast to the analytical solution, is usually reduced to a multiple solution of the primal problem. In the present work, the hydrodynamic mathematical model of a pipeline with two parameters that have been identified and fluid withdrawal in the set section is confined to differential equations of evolutionary type for medium cross-section pressure and mass flow. Based on the built partial analytical solutions of these equations, dependences have been obtained for calculation of pressure values in the oil pipeline operated in stationary mode with existing liquid withdrawal (leakage). Results of application of analytical solutions to the method of sensitivity functions in the inverse problem of identifying leakage parameters have been reviewed. Exact analytical solution (in implicit form) of the inverse problem has been obtained to make it possible to relate the location of the leak to readings of pressure sensors, to the pipeline and the transported fluid parameters. Известно, что на основе нестационарной гидродинамической модели трубопровода после идентификации входящих в нее параметров можно адекватно воспроизводить натурные гидравлические характеристики потока транспортируемой среды путем решения прямой задачи гидравлики, в частности, прямой задачи об утечке, когда местоположение и расход отбора заданы. Численное решение обратной задачи, в отличие от аналитического обычно сводится к многократному решению прямой задачи. В предлагаемой работе гидродинамическая математическая модель трубопровода с двумя параметрами, прошедшими идентификацию, и отбором жидкости в заданном сечении сведена к дифференциальным уравнениям эволюционного типа для среднего по сечению давления и массового расхода. На основе частных аналитических решений данных уравнений получены зависимости для определения давления в работающем в стационарном режиме нефтепроводе при наличии отбора (утечки). Рассмотрены результаты применения аналитических решений к методу функций чувствительности в обратной задаче утечки. Получено точное аналитическое решение (в неявной форме) обратной задачи, позволяющее связать местоположение утечки с показаниями датчиков давления, характеристиками трубопровода и транспортируемой среды.

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Panda, U. S., M. M. Mahanty, V. Ranga Rao, S. Patra, and P. Mishra. "Hydrodynamics and Water Quality in Chilika Lagoon-A Modelling Approach." Procedia Engineering 116 (2015): 639–46. http://dx.doi.org/10.1016/j.proeng.2015.08.337.

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Pinho, J. L. S., J. M. Pereira Vieira, and J. S. Antunes do Carmo. "Hydroinformatic environment for coastal waters hydrodynamics and water quality modelling." Advances in Engineering Software 35, no. 3-4 (March 2004): 205–22. http://dx.doi.org/10.1016/j.advengsoft.2004.01.001.

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Zhang, Chen, Xueping Gao, Liyi Wang, and Yuanyuan Chen. "Analysis of agricultural pollution by flood flow impact on water quality in a reservoir using a three-dimensional water quality model." Journal of Hydroinformatics 15, no. 4 (April 4, 2012): 1061–72. http://dx.doi.org/10.2166/hydro.2012.131.

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This study presents the Yuqiao Reservoir Water Quality Model (YRWQM), a three-dimensional hydrodynamic and water quality model of the Yuqiao reservoir, China. The YRWQM was developed under the environmental fluid dynamics code (EFDC) model and was calibrated and verified to hydrodynamic and water quality data, using two sets of observed data from January 1 to December 31, 2006 and from May 1 to October 31, 2007, respectively. The primary hydrodynamic and transport driving forces are inflows/outflows and surface wind stresses. Considering effects of water transfer and wind on the advection-dispersion processes, the model results showed better agreements with observed data in the reservoir. The YRWQM predicted the variations of water quality resulting from agricultural pollution which flowed into the reservoir with floods lasting for 12 days in 2009. The results indicated that the concentrations of chemical oxygen demand and total nitrogen were increased 225 and 314%, respectively. Considering the interactions between chlorophyll-a and nitrogen in the model, the results indicated the reservoir was not a nitrogen-limited environment. We suggest the management should focus on agricultural pollution strategies for the reservoir during the flood period. The YRWQM could be a useful tool for water sources management in the reservoir.

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37

Gaines, W. A., B. R. Kim, A. R. Drews, C. Bailey, T. Loch, and S. Frenette. "Hydrodynamic Cavitation Pilot Study for Controlling Cooling Water Quality." Proceedings of the Water Environment Federation 2006, no. 13 (January 1, 2006): 154–61. http://dx.doi.org/10.2175/193864706783711027.

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38

Atkinson, Joseph F., Sunil K. Gupta, Joseph V. DePinto, and Ralph R. Rumer. "Linking Hydrodynamic and Water Quality Models with Different Scales." Journal of Environmental Engineering 124, no. 5 (May 1998): 399–408. http://dx.doi.org/10.1061/(asce)0733-9372(1998)124:5(399).

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39

Zhou, Hui Ping, Wei Yun Shao, and Li Jie Jiang. "Optimal Model of Hydrodynamic Controlling on Pumps and Slice Gates for Water Quality Improvement." Applied Mechanics and Materials 316-317 (April 2013): 732–40. http://dx.doi.org/10.4028/www.scientific.net/amm.316-317.732.

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In order to evaluate the effective of the hydrodynamic control of pumps and slice gates in plain river network on the water quality improvement, an optimal mathematic model of hydrodynamic controlling on the pumps and slice gates in plain river network was established by combining the water quality objective function and the cost objective function together. The cost function has been set as the main objective function, while the water quality objective function was simplified as the restrained condition for every required water quality index, through which the multi-objective optimization was transferred into a single-objective optimization. Then, this optimal model was solved by coupling the water environmental model with the hybrid genetic algorithm. The case study of Jiaxing river network shows that the proposed hydrodynamic controlling optimal model in this paper can develop the optimal water diversion scheme for water quality improvement and cut its cost. It works better compared to the traditional water quality objective function and can be used in the engineering practice.

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40

Su, J. L., Y. Wang, J. Chen, Q. L. Zhang, Y. Zhang, and Y. J. Guo. "Simulation of hydrodynamics and water quality in Xi’an Yanming Lake China." IOP Conference Series: Earth and Environmental Science 191 (November 5, 2018): 012066. http://dx.doi.org/10.1088/1755-1315/191/1/012066.

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41

Schroyen, Bram, James W. Swan, Peter Van Puyvelde, and Jan Vermant. "Quantifying the dispersion quality of partially aggregated colloidal dispersions by high frequency rheology." Soft Matter 13, no. 43 (2017): 7897–906. http://dx.doi.org/10.1039/c7sm01690e.

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42

Wang, P. F. "Dispersion resulting from aggregating hydrodynamic properties in water quality modeling." International Journal of Engineering Science 39, no. 1 (January 2001): 95–112. http://dx.doi.org/10.1016/s0020-7225(00)00021-5.

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Wetzel, J. M., and R. E. A. Arndt. "Hydrodynamic Design Considerations for Hydroacoustic Facilities: Part I—Flow Quality." Journal of Fluids Engineering 116, no. 2 (June 1, 1994): 324–31. http://dx.doi.org/10.1115/1.2910275.

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Design studies are described for two recently completed large scale hydroacoustic test facilities (one of which is the world’s largest). These recirculating water tunnels have a different configuration than conventional tunnels, and special hydrodynamic design studies were required to evaluate and optimize the performance of some critical components. This paper considers the flow quality in the test section as influenced by the design of the contraction and the turbulence management system. Numerical modeling and experimental work were used to arrive at an acceptable nonsymmetrical nozzle design. Studies were also made of a turbulence management system using honeycombs rather than screens as typically used. Although design goals for turbulence levels were met, this study indicated that additional research in the area of turbulence management is necessary before there is a complete understanding of the overall process of turbulence attenuation.

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44

Eparu, Cristian Nicolae, Sorin Neacsu, and Adrian Neacsa. "Correlation of Gas Quality with Hydrodynamic Parameters in Transmission Networks." MATEC Web of Conferences 290 (2019): 10001. http://dx.doi.org/10.1051/matecconf/201929010001.

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Natural gases are a mixture of hydrocarbons. Their composition determines the basic variables that need to be taken into account in the calculation of transport or gathering systems. In the daily operation of gas gathering and transport networks, the available composition measured by online systems is reduced. In the usual composition a pseudo-component called C6+ (or C7+) is used. If this component is defined from the complete chromatograph analysis of gas, the properties are established through a lumping procedure. Online chromatographic analysis is done on a small group of basic components, usually for heavy components by introducing a pseudo-component, in this paper called C6+. In this paper we will show how to determine the properties of the pseudo-component according to the measured density of the mixture and its dynamics through the network. Generally, transport networks operators are interested in operating them so as to maximize the benefit and reduce any penalties. For this they have SCADA systems, which provide information on transport parameters and gas quality at the monitored points. The overall picture of the network and its short and medium-term evolution is achieved with a powerful simulator. Managing the gas quality from the entry points to the exit points must be made dynamically by the simulator. In this paper we will present results obtained with the ADMODUNET simulator produced by NetGas R&D based on the company’s agreement.

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TANAKA, Hitoshi, Trung Viet NGUYEN, Hiroto YAMAJI, Mitsuru TAKASAKI, Somboon PORNPINATEPONG, and Kunlayanee PORNPINATEPONG. "Relationship between Lake Hydrodynamics and Water Quality in Songkhla Aquaculture Farm, Thailand." PROCEEDINGS OF COASTAL ENGINEERING, JSCE 54 (2007): 1391–95. http://dx.doi.org/10.2208/proce1989.54.1391.

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46

McEwan, James, Albert J. Gabric, and Peter R. F. Bell. "Water quality and phytoplankton dynamics in Moreton Bay, south-eastern Queensland. II. Mathematical modelling." Marine and Freshwater Research 49, no. 3 (1998): 227. http://dx.doi.org/10.1071/mf97123.

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A coupled hydrodynamic water-quality model of Moreton Bay was developed to enable better management of nutrient loads and to predict eutrophication-related problems. The hydrodynamic submodel was calibrated to available tidal data, and the transport submodel was calibrated to a salinity dataset. A 15-month time-series of field data was used together with historical data to calibrate and validate the water-quality submodel. Model simulations suggest that denitrification removes over half the external N inputs with about one-third exported to the open ocean. Approximately 8% of N and 20% of the P loading accumulates in the sediments. Short-term variations due to hydrodynamic effects tend to mask the seasonal cycle in phytoplankton biomass except at inshore localities. The model predictions confirm the field data that indicate that water quality in the western bay is severely affected while the better flushed eastern region remains relatively unaffected. Future increases in nutrient loading due to population pressure are predicted to extend the severely affected region eastwards. Over most of the bay, algal productivity is N-limited except for the western margins where nutrients are saturating and light availability regulates growth. Model hindcasts suggest that system-wide mean algal production has increased by a factor of ten since European settlement.

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Lu, Chengwei, Jianzhong Zhou, Dechao Hu, Shuai Yuan, and Yi Liu. "Fast and high-precision simulation of hydrodynamic and water quality process in river networks." MATEC Web of Conferences 246 (2018): 01073. http://dx.doi.org/10.1051/matecconf/201824601073.

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To realize a fast and high-precision simulation of unsteady flows and water quality process in river networks, a 1-D mathematical modelling system for free-surface flows and water quality process is developed. In the hydrodynamic model, a θ semi-implicit method is used to discretize the free-surface gradient term in the momentum equation while the Eulerian-Lagrangian method is employed to solve the advection term. To achieve good mass conservation, the finite-volume method is used to discretize continuity equation. Moreover, the resulting hydrodynamic model is unconditionally stable with respect to the gravity wave speed and flow advection. In solving the scalar transport equation, the forward difference is used for discretization in time while the centre-difference is in space. A sub-cycling is introduced to divide the computational time step and improve the stability of water quality model. Therefore, large time steps are allowed in both the hydrodynamic and the transport models. The coupling of the branches of the river networks is solved using a predictioncorrection method. Then, a Gaussian pulse test and a rectangular wave test are employed to demonstrate the accuracy and the efficiency of the system, which will also provide powerful supports for ecological operations of cascade reservoirs in drainage basins.

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Zui, H., and T. Shinke. "Seismic Response Analysis of Cylindrical Tanks With Initial Irregularities on Side Walls." Journal of Pressure Vessel Technology 107, no. 2 (May 1, 1985): 107–17. http://dx.doi.org/10.1115/1.3264421.

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The objective of this paper is to report the findings of the study on the effects of initial irregularities on the seismic response of cylindrical tanks. The initial irregularities induce circumferential hydrodynamic pressure components of high-order modes, which are neglected in current design assumptions. Seismic response formulas for cylindrical tanks with arbitrary initial irregularities have been derived from Lagrange’s kinematic equation taking into account natural frequencies, vibrational modes and the hydrodynamic pressure. The hydrodynamic pressure in an irregular tank is evaluated by using velocity potential function. Natural frequency analysis is done by means of the transfer matrix method taking into consideration the initial hoop stress. The effect of aspect ratio H/D (H: liquid height and D: tank diameter) and the shape of initial irregularities are further examined by numerical calculations.

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Thongtha, Kaboon, and Jaipong Kasemsuwan. "Numerical Simulations of Water Quality Measurement Model in an Opened-Closed Reservoir with Contaminant Removal Mechanism." International Journal of Differential Equations 2018 (May 2, 2018): 1–12. http://dx.doi.org/10.1155/2018/1343541.

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The mathematical simulation of water contaminant measurement is often used to assess the water quality. The monitoring point placement for water quality measurement in an opened-closed reservoir can give accurate or inaccurate assessment. In this research, the mathematical model of the approximated water quality in an opened-closed reservoir with removal mechanism system is proposed. The water quality model consists of the hydrodynamic model and the dispersion model. The hydrodynamic model is used to describe the water current in the opened-closed reservoir. The transient advection-diffusion equation with removal mechanism provides the water pollutant concentration. The water velocity from the hydrodynamic model is plugged into the dispersion model. The finite difference techniques are used to approximate the solution of the water quality model. The proposed numerical simulations give a suitable area of zonal removal mechanism placement. The proposed simulations also give the overall and specified approximated water quality for each point and time when the exit gate is opened on the different periods of time. In addition, the proposed techniques can give a suitable period of time to open the exit gate to achieve a good agreement water quality by using contaminant removal mechanism.

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Pochai, Nopparat. "A Numerical Treatment of Nondimensional Form of Water Quality Model in a Nonuniform Flow Stream Using Saulyev Scheme." Mathematical Problems in Engineering 2011 (2011): 1–15. http://dx.doi.org/10.1155/2011/491317.

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The stream water quality model of water quality assessment problems often involves numerical methods to solve the equations. The governing equation of the uniform flow model is one-dimensional advection-dispersion-reaction equations (ADREs). In this paper, a better finite difference scheme for solving ADRE is focused, and the effect of nonuniform water flows in a stream is considered. Two mathematical models are used to simulate pollution due to sewage effluent. The first is a hydrodynamic model that provides the velocity field and elevation of the water flow. The second is a advection-dispersion-reaction model that gives the pollutant concentration fields after input of the velocity data from the hydrodynamic model. For numerical techniques, we used the Crank-Nicolson method for system of a hydrodynamic model and the explicit schemes to the dispersion model. The revised explicit schemes are modified from two computation techniques of uniform flow stream problems: forward time central space (FTCS) and Saulyev schemes for dispersion model. A comparison of both schemes regarding stability aspect is provided so as to illustrate their applicability to the real-world problem.

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