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United States Department of Agriculture

Agricultural Research Service

Research Project: AGRICULTURAL LAND MANAGEMENT TO OPTIMIZE PRODUCTIVITY AND NATURAL RESOURCE CONSERVATION AT FARM AND WATERSHED SCALES

Location: Great Plains Agroclimate and Natural Resources Research Unit

Title: Modeling multiple surface watersheds contributing to one aquifer using the SWATmf framework

Authors
item Guzman, Jorge
item Moriasi, Daniel
item Gowda, Prasanna
item Steiner, Jean
item Arnold, Jeffrey
item Srinivasan, Raghavan -
item Starks, Patrick
item Chu, Ma. -

Submitted to: Modflow And Other Modeling Odysseys
Publication Type: Abstract Only
Publication Acceptance Date: January 26, 2013
Publication Date: N/A

Interpretive Summary: Abstract only

Technical Abstract: Surface-subsurface integrated modeling is commonly limited by the extent of the surface domain. This limitation requires modelers to define the subsurface boundaries as a function of the surface domain resulting in inaccurate flow and transport simulation at the model boundary. In this study, the SWATmf modeling framework, which couples the Soil and Water Assessment Tool (SWAT) and the Modular Three-Dimensional Finite-Difference Groundwater Flow (MODFLOW), was used to develop an integrated model using data from the Fort Cobb Reservoir Experimental Watershed (FCREW), located in southern Oklahoma. A series of new routines were incorporated in the SWATmf modeling framework to interface multiple sub- watershed specific SWAT simulation (i.e., SWAT models) in one MODFLOW model. A surface-subsurface modeling case study was developed for daily simulations (Oct-2010 to Aug-2012) in Cobb Creek, Lake Creek, Willow Creek, and the lower Fort Cobb Reservoir subwatersheds encompassing the larger FCREW. Groundwater levels in the FCREW were estimated by the coupled model. The modified modeling framework allowed MODFLOW simulation of distributed daily percolation fluxes and well extraction volumes from multiple simulated SWAT models. Errors in time-variant groundwater levels at three USGS monitoring wells were less than 1%. Moreover, the case study served to evaluate the modified modeling framework. The modified modeling framework will enable simulation of distributed surface-subsurface flow and transport fluxes in which multiple surface watersheds contribute to one aquifer.

Last Modified: 4/17/2014
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