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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: Integrated SWAT-modflow modeling framework: Modeling multiple disconnected surface watersheds on a single subsurface aquifer extent

Authors
item Guzman, Jorge
item Moriasi, Daniel
item Gowda, Prasanna
item Starks, Patrick
item Steiner, Jean
item Verser, Jerry

Submitted to: Modflow And Other Modeling Odysseys
Publication Type: Proceedings
Publication Acceptance Date: April 2, 2013
Publication Date: June 2, 2013
Citation: Guzman Jaimes, J.A., Moriasi, D.N., Gowda, P., Starks, P.J., Steiner, J.L., Verser, J.A. 2013. Integrated SWAT-modflow modeling framework: Modeling multiple disconnected surface watersheds on a single subsurface aquifer extent [abstract]. Modflow and More 2013. Translating Science into Practice Conference, June 2-5, 2013, Golden, Colorado. p. 193-196.

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 modified to provide the capability of modeling multiple surface watersheds to a single subsurface aquifer extent. Data from the Fort Cobb Reservoir Experimental Watershed (FCREW), located in southern Oklahoma was used in this study. A series of new routines were incorporated in the SWATmf modeling framework to interface multiple sub- watershed SWAT simulations (i.e., SWAT models) with one MODFLOW model. A surface-subsurface modeling case study was developed for daily simulations (Oct-2010 to Aug-2012) in Cobb Creek, Lake Creek, and Willow Creek sub-watersheds encompassing the upper part of the FCREW. Groundwater levels in the FCREW were estimated by the integrated model. The modified modeling framework allowed MODFLOW simulation of distributed daily percolation fluxes and well extraction volumes from multiple simulated SWAT models. 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 disconnected watersheds contribute to a single aquifer extend.

Last Modified: 9/1/2014
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