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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 38 for “"Groundwater Model"”.
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Groundwater model of the Nahr Ibrahim Valley, Lebanon
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.
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Data-Driven Models to Enhance Physically-Based Groundwater Model Predictions
… and the validity of the complementary modeling framework are tested using both hypothetical and real-world groundwater flow problems of varying complexity. The results indicate that the complementary modeling framework presents a promising and viable alternative to improve groundwater …
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Impact of uncertain input on parameter estimation in groundwater model
… and probably the most challenging aspect of groundwater modeling. In the context of groundwater modeling, although many studies have focused on parameter estimation problems, these issues are far from being solved. When important hydrogeological parameters like transmissivity and storativity …
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Coupled Surface Water-Groundwater Model to Analyze Sustainability of the Atascadero Subbasin
… separated sub-region of the Paso Robles Groundwater Basin. Three local cities operate approximately 40 wells to pump the Subbasin for their entire water supply needs. Past studies have questioned sustainability of the Subbasin as the combined pumping rate by the three cities is nearing …
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The use of numerical groundwater model to improve effectiveness of subsurface drainage system in irrigated field
… that Three-Dimensional Variable-Density Groundwater Flow<br/>models such as the SEAWAT model can be effectively used for design of subsurface<br/>drainage systems for controlling salt concentration in the root zone on salt affected<br/>irrigated land. The SEAWAT model was used to optimize …
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Spatial and temporal estimation of pumping and recharge in groundwater system analysis
In many parts of the U.S., groundwater is used as the primary or secondary source of water for the public supply, agricultural, and industrial sectors. In southwestern Louisiana, a majority of the water demand is supplied by the Chicot aquifer. Numerical flow models are useful for managing and …
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Evaluating least absolute deviation regression as an inverse model in groundwater flow calibration
… built into the US Geological Survey MODFLOW groundwater model works well with single layer geologic systems; however, it does not work well with multi-layer systems. This dissertation provides the Least sum Absolute Deviation regression and Expectation Maximization procedures. These new …
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Hydrologic investigation of three constructed mitigation wetlands and one natural wetland in West Virginia
… reference wetland site. In addition, a numerical groundwater model was developed for a portion of one of the constructed mitigation wetlands.;Hydrologic, meteorologic, topographic, and geotechnical data were collected at three constructed mitigation wetlands and one reference natural wetland. …
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Subsurface transport of fertilizer-applied nitrogen on the eastern shore of Virginia
… surface, where it is applied as fertilizer, to groundwater is of importance due to the health concerns associated with nitrate and potential eutrophication of groundwater impacted surface water. The computer model, PRZM (Pesticide Root Zone Model) was used to simulate the transportation of …
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Agent-based models to couple natural and human systems for watershed management analysis
… conventional physically-based environmental models with human factors for watershed management analysis. Using an agent-based modeling framework, two approaches, one based on optimization and the other on data mining-are applied to modeling farmers' pumping decision-making processes in the …
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An investigation of leaky sewers as a source of fecal contamination in the stormwater drainage system in Singapore
… were assembled from the literature on sewer-groundwater interaction and Singapore's geology, the history and current state of Singapore's sewer infrastructure, the results of a groundwater model, field observations, and GIS data on the sewer and drainage network layout. It was found that …
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Hydrologic and hydraulic assessment of artificial recharge in the Sparta Aquifer of Union County, Arkansas
Groundwater pumping from the Sparta aquifer in Union County, Arkansas, has long exceeded natural recharge, threatening the regional water supply. An alternative water-supply project, completed in 2004, now provides treated surfacewater to local industries. This conjunctive use of surface- and …
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The hydrogeological investigation of worked coal measures rocks and its application to the modelling of groundwater flows
… taken place are often characterised by complex groundwater regimes. Many of the vast areas of disused and derelict terrain resulting from these activities, have now been developed as landfills. As landfill sites may constitute a major source of groundwater contamination, the hydrogeology of a …
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The nitrate deposits of rock crevices in the Upper Mississippi Valley
… 0.01 to 4 percent. But the Hill (1981) seeping groundwater model, which satisfactorily accounts for the nitrate deposits of the historic saltpeter caves of the southeastern United States, does not apply in the UMV. Through the application of geochemical and isotopic analysis to soil solutions it …
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Evaluation of a Water Budget Model for Use in Wetland Design
… of created wetlands. A wetland water budget model, Wetbud, was developed by collaborators from Virginia Tech, Old Dominion University, and the Technical University of Crete for estimating wetland water budgets to assist wetland design in the Virginia Piedmont. The Wetbud model has basic and …
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Bayesian Saltwater Intrusion Prediction and Remediation Design under Uncertainty
Groundwater resources are vital for sustainable economic and demographic developments. Reliable prediction of groundwater head and contaminant transport is necessary for sustainable management of the groundwater resources. However, the groundwater simulation models are subjected to uncertainty in …
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Modeling injection and extraction wells for seawater desalination in SEAWAT
… coastal environment. In this study, we developed groundwater models in SEAWAT, a three-dimensional finite difference groundwater model capable of simulating a varying-density environment, to learn about the interactions of seawater, brackish water, freshwater and brine due to extraction and …
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Assessing recharge and discharge across the prairie pothole landscape: application of spatial hydrological data and statistical analysis in a groundwater flow model
… the spatial and temporal dynamics between groundwater recharge, discharge, and wetlands is a necessary step to develop effective water management strategies. Wetlands in the northern Great Plains play a role in flood control, water supply, and regional ecology. The water budget of a wetland …
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Water resources decision making using meta-heuristic optimization methods
… particularly to optimally design and operate groundwater storage and recovery projects. The effort included developing an integrated simulation-optimization management model for complex aquifer recharge/extraction operation considering water quality transformation. The research demonstrated …
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Effect of hydrological flow pattern on groundwater arsenic concentration in Bangladesh by Khandaker Ashfaque.
Widespread arsenic contamination of groundwater has become a major concern in Bangladesh since the water supply, particularly in rural areas, is heavily dependent on groundwater. However, relative to the extent of research on biogeochemical processes of arsenic mobilization, very little work has …
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