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Title: An Improved Representation of Vegetative Filter Strips in SWAT

Abstract

<italic>Abstract.</italic> Vegetative filter strips (VFS) are popular conservation practices installed at the edges of agricultural fields to reduce losses of pollutants from agricultural areas to receiving waterbodies. The recent interest in using VFS areas as multifunctional landscapes necessitates an improved depiction of VFS in simulation models. This study is aimed to enhance the physical representation of VFS in the Soil and Water Assessment Tool (SWAT) to improve the representation of ecohydrologic processes and land management practices in VFS areas. The proposed enhancement enables routing of water, sediment, and nutrients from the source area through the VFS area and makes the infiltrated water and nutrients available for filter crop uptake. The improvements are implemented in SWAT by modifying input files through Matlab scripts and by changing SWAT subroutines to enable routing. The model improvements are tested with three paired watershed studies with and without edge-of-field VFS in central Iowa. The improved model estimated 46% runoff reduction, 91% sediment reduction, 83% total phosphorus reduction, and 54% nitrate reduction with VFS, and these estimates closely matched the measured VFS reductions. The improved model was able to represent increased infiltration, soil moisture, and denitrification in the VFS area, along with accurately capturing crop yieldsmore » in the source and VFS areas. Overall, the results indicate improved physical representation of VFS in SWAT. Keywords: Conservation measures, Flexible buffer strips, Multifunctional buffers, SWAT model, Vegetative filter strips.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1541901
DOE Contract Number:  
EE0004396
Resource Type:
Journal Article
Journal Name:
Transactions of the ASABE (Online)
Additional Journal Information:
Journal Volume: 61; Journal Issue: 3; Journal ID: ISSN 2151-0040
Publisher:
American Society of Agricultural and Biological Engineers
Country of Publication:
United States
Language:
English
Subject:
Agriculture

Citation Formats

Cibin, Raj, Chaubey, Indrajeet, Helmers, Matthew J., Sudheer, K. P., White, Michael J., and Arnold, Jeffrey G. An Improved Representation of Vegetative Filter Strips in SWAT. United States: N. p., 2018. Web. doi:10.13031/trans.12661.
Cibin, Raj, Chaubey, Indrajeet, Helmers, Matthew J., Sudheer, K. P., White, Michael J., & Arnold, Jeffrey G. An Improved Representation of Vegetative Filter Strips in SWAT. United States. doi:10.13031/trans.12661.
Cibin, Raj, Chaubey, Indrajeet, Helmers, Matthew J., Sudheer, K. P., White, Michael J., and Arnold, Jeffrey G. Mon . "An Improved Representation of Vegetative Filter Strips in SWAT". United States. doi:10.13031/trans.12661.
@article{osti_1541901,
title = {An Improved Representation of Vegetative Filter Strips in SWAT},
author = {Cibin, Raj and Chaubey, Indrajeet and Helmers, Matthew J. and Sudheer, K. P. and White, Michael J. and Arnold, Jeffrey G.},
abstractNote = {<italic>Abstract.</italic> Vegetative filter strips (VFS) are popular conservation practices installed at the edges of agricultural fields to reduce losses of pollutants from agricultural areas to receiving waterbodies. The recent interest in using VFS areas as multifunctional landscapes necessitates an improved depiction of VFS in simulation models. This study is aimed to enhance the physical representation of VFS in the Soil and Water Assessment Tool (SWAT) to improve the representation of ecohydrologic processes and land management practices in VFS areas. The proposed enhancement enables routing of water, sediment, and nutrients from the source area through the VFS area and makes the infiltrated water and nutrients available for filter crop uptake. The improvements are implemented in SWAT by modifying input files through Matlab scripts and by changing SWAT subroutines to enable routing. The model improvements are tested with three paired watershed studies with and without edge-of-field VFS in central Iowa. The improved model estimated 46% runoff reduction, 91% sediment reduction, 83% total phosphorus reduction, and 54% nitrate reduction with VFS, and these estimates closely matched the measured VFS reductions. The improved model was able to represent increased infiltration, soil moisture, and denitrification in the VFS area, along with accurately capturing crop yields in the source and VFS areas. Overall, the results indicate improved physical representation of VFS in SWAT. Keywords: Conservation measures, Flexible buffer strips, Multifunctional buffers, SWAT model, Vegetative filter strips.},
doi = {10.13031/trans.12661},
journal = {Transactions of the ASABE (Online)},
issn = {2151-0040},
number = 3,
volume = 61,
place = {United States},
year = {2018},
month = {1}
}