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Showing 1 to 20 of 25 for “"Groundwater Flow Model"”.
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Improving groundwater flow model parametrization techniques
Numerical modeling of groundwater flow is a powerful tool that can assist in hydrogeological analysis and understanding of groundwater system behavior. However, its results are highly dependent on the proper model parameterization (often, at least partially achieved through calibration). The …
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Development of a Groundwater Flow Model for Hungry Valley, Washoe County, Nevada
… of the community is dependent on sustainable groundwater development. Previous hydrogeologic assessments and pumping tests have consistently concluded that the aquifers are of limited extent. The aquifers are characterized by low transmissivities with storativity values indicating the aquifers …
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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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Using electrical resistivity tomography to calibrate seawater intrusion models along the Alabama Gulf Coast
Numerical models (e.g., MODFLOW/SEAWAT) are commonly used to quantify the extent and magnitude of seawater intrusion (SI). Since coastal communities must account for SI into local aquifers, numerical models can be an effective planning and management tool as coastal populations increase. While …
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Risk assessment and uncertainty analysis in groundwater modelling
… systems. Therefore, parameter uncertainty in groundwater models casts big doubts in the accuracy of the model output. The failure in determination and taken into consideration the affect of uncertainty in model parameters could considerably reduce the possibility of success of any management …
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Fréchet Sensitivity Analysis and Parameter Estimation in Groundwater Flow Models
… corresponding to a multilayer aquifer/interbed groundwater flow model. The parameter estimation problem is formulated as an optimization problem, then addressed with algorithms based on adjoint equations, quasi-Newton schemes, and multilevel optimization. In addition to the parameter estimation …
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Using MODFLOW to Predict Impacts of Groundwater Pumpage to Instream Flow: Upper Kittitas County, Washington
… 1960, new water demands have been met through groundwater withdrawals, with most groundwater users holding a later priority date than senior and junior surface water users. As a result of the discussions surrounding this issue, the Upper Kittitas Groundwater Rule has been in effect since 2010. …
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Evapotranspiration Measurement and Simulation due to Poplar Trees at a Phytoremediation Site
… system and then determining the effect on groundwater flow. This will be accomplished by quantifying evapotranspiration using a water budget, applying White's Equation, comparing groundwater recession curves, creating a groundwater flow model, and examining water table elevations obtained …
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A geohydrological study of the Richards Bay area
Numerical methods such as groundwater models can play a vital rplein understanding the dynamics of an aquifer provided that the input data is accurate and sufficient to represent the environmental system adequately. The groundwater flow mode! used in this project requires specific information about …
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Sequential Electron Acceptor Model of Intrinsic Bioremediation at a BTEX Contaminated LUST Site in Laurel Bay, South Carolina
Contaminant transport modeling is being used more often at petroleum hydrocarbon contaminated sites in an attempt to aid engineers in evaluating the feasibility of natural attenuation as a remediation alternative in groundwater systems. In this research, a three-dimensional sequential electron …
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Modeling the Impacts of Land Use Activities on the Subsurface Flow Regime of the Upper Roanoke River Watershed
… impact of land use activities on the subsurface flow regime in the Upper Roanoke River Watershed in Virginia to determine the impacts of land use change on the subsurface flow system, and to provide a tool for future management decisions. Land use activities can impact the groundwater system in …
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The Effect of Evapotranspiration on the Groundwater Dome and Past Drought Conditions at Cape Henry, Virginia
… of the park has fewer wetlands. An asymmetric groundwater dome has been observed on Cape Henry, cresting north of the geographic center of the cuspate foreland. The purpose of this study was to determine if the wetlands that dominate the southern portion of the park are the major driver of the …
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A study of the groundwater travel time distribution at a rural watershed in Iowa: A systems theory approach to groundwater flow analysis
<p>This dissertation is a study of groundwater-surface water interaction in terms of the travel time distribution framework applied to a tile-drained, agricultural landscape at the watershed scale. Specifically, we examined the two dimensional, steady state groundwater flow characterizing a …
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Modeling biotic and abiotic decay of trichloroethylene (TCE) using the Reactive Multi-Species Transport in 3-Dimensional Groundwater Aquifers (RT3D) code
… TCE, is vital to improving the health of groundwater systems. TCE contamination of groundwater systems is of significant concern and its removal a significant challenge. One of the main causes of delays in cleanup of a TCE contaminated site results from back diffusion. Back diffusion …
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Development of a model for simulation of solute transport in a stream aquifer system
A model for simulation of solute transport in a stream-aquifer system is developed. The model is referred to as: Model for Stream-Aquifer Solute Transport or MSAST. The MSAST is developed by coupling four primary models: The groundwater flow model, MODFLOW-96, the coupled groundwater surface water …
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A comparison of Wellhead Protection area delineation methods at Larimore, North Dakota
… to contamination. A strategy to protect public groundwater supplies is the delineation of wellhead protection areas (WHPAs) around the area which contributes water to a well. Several delineation methods are available, all of which have simplifying assumptions which affect the size or shape of a …
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Hydrogeology of the Kalahari in north-eastern Namibia
… diffuse recharge and locally some preferred flow path recharge develops along shrinkage cracks and rootlets. Five substratum classes have been soil physically studied: Pans and vleis, brown to red soils, dune sand, soil with an aeolian influence, and calcrete. Aeolian sands are most promising …
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Modelling the impact of total stress changes on groundwater flow
… the impact of total stress changes on groundwater flow in the vicinity of a salt tailings pile. Total stress and pore-pressure data observed at the Lanigan and Rocanville potash-mine sites were used to assist the development of a generic FEMWATER model. The original 3-D mesh considered …
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Assessing long-term conservation of groundwater resources in the Ogallala Aquifer Region using hydro-agronomic modeling
Groundwater is vital for domestic use, municipalities, agricultural irrigation, industrial processes, etc. Over the past century, excessive groundwater depletion has occurred globally and regionally, notably in arid and semi-arid regions, often due to providing irrigation water for crop …
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Geology, hydrology and hydrogeochemistry of the West Brush Creek Development Area, Beulah Mine, Mercer County, North Dakota
… Modular Three-Dimensional Finite-Difference Groundwater Flow Model was used to predict the inflow of groundwater to the mine pits, as well as potential short and long-term drawdowns of the lignite aquifers. The model predicted that both pit-water inflows and drawdowns will be negligible.</p> …
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