Lin, Hsin-Chi Jerry
[VerfasserIn];
Deliman, Patrick N.
[VerfasserIn];
Martin, William D.
[VerfasserIn]
;
Environmental Laboratory (U.S.)
[MitwirkendeR];
United States. Environmental Protection Agency.
[MitwirkendeR];
Environmental Research Laboratory (Athens, Ga.)
[MitwirkendeR]
FEMWATER Usability for the EPA MASTER and Wellhead Protection Research Programs
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Beschreibung:
Source: https://erdc-library.erdc.dren.mil/jspui/ ; Walnut Creek watershed is located within Boone and Story Counties of central Iowa. Walnut Creek has been extensively monitored as part of the U.S. Environmental Protection Agency (EPA) Midwest Agricultural Surface and Subsurface Transport and Effects Research Program. The objectives of this study were to demonstrate usability of the existing GMS to conduct a preliminary exposure assessment for agricultural chemicals used in the Walnut Creek watershed and to evaluate impacts of varying the agricultural chemical load through sensitivity analysis of changes to model parameters. Two three-dimensional (3-D) meshes of Walnut Creek watershed were created by GMS. One 3-D was an inset mesh of the subdrain tile system of the watershed. This mesh was used to test and evaluate schemes to represent the drain tile feature of the watershed. The other 3-D mesh was used to represent the entire watershed based on the best available data. This mesh was used to study the movement of agricultural chemicals applied to the surface. Groundwater flow was simulated by a 3-D finite element model of density-dependent flow and transport through saturated-unsaturated porous media (FEMWATER). The 6-month simulated flow was used to evaluate the impact of the application of agrichemicals on groundwater quality. The flow fields and transport results are consistent with those one would expect to observe. The FEMWATER model demonstrates its flexibility and versatility of application in a wide range of real-world problems, including the simulation of flow alone, transport alone, as well as combined flow and transport problems. A robust, graphic interactive pre-processor and post-processor software has been implemented to support the model. It makes the sophisticated and complicated FEMWATER model simpler to use and able to address a variety of problems.