Evaluation of Existing and Modified Wetland Equations in the SWAT Model

dc.contributor.author Crumpton, William
dc.contributor.author Arnold, Jeffrey
dc.contributor.author Soupir, Michelle
dc.contributor.author Gassman, Philip
dc.contributor.department Center for Agricultural and Rural Development
dc.contributor.department Ecology, Evolution and Organismal Biology
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-01-20T05:50:03.000
dc.date.accessioned 2020-06-29T22:43:12Z
dc.date.available 2020-06-29T22:43:12Z
dc.date.issued 2017-12-01
dc.description.abstract <p>The ability to accurately simulate flow and nutrient removal in treatment wetlands within an agricultural, watershed-scale model is needed to develop effective plans for meeting nutrient reduction goals associated with protection of drinking water supplies and reduction of the Gulf of Mexico hypoxic zone. The objectives of this study were to incorporate new equations for wetland hydrology and nutrient removal in Soil and Water Assessment Tool (SWAT), compare model performance using original and improved equations, and evaluate the ramifications of errors in watershed and tile drain simulation on prediction of NO3-N dynamics in wetlands. The modified equations produced Nash-Sutcliffe Efficiency values of 0.88 to 0.99 for daily NO3-N load predictions, and percent bias values generally less than 6%. However, statistical improvement over the original equations was marginal and both old and new equations provided accurate simulations. The new equations reduce the model's dependence on detailed monitoring data and hydrologic calibration. Additionally, the modified equations increase SWAT's versatility by incorporating a weir equation and an irreducible nutrient concentration and temperature coefficient. Model improvements enhance the utility of SWAT for simulating flow and nutrients in wetlands and other impoundments, although performance is limited by the accuracy of inflow and NO3-N predictions from the contributing watershed. Editor's note: This paper is part of the featured series on SWAT Applications for Emerging Hydrologic and Water Quality Challenges. See the February 2017 issue for the introduction and background to the series.</p>
dc.description.comments <p>This article is published as Ikenberry, Charles D., William G. Crumpton, Jeffrey G. Arnold, Michelle L. Soupir, and Philip W. Gassman. "Evaluation of Existing and Modified Wetland Equations in the SWAT Model." JAWRA Journal of the American Water Resources Association 53, no. 6 (2017): 1267-1280. doi: <a href="http://dx.doi.org/10.1111/1752-1688.12570" target="_blank">10.1111/1752-1688.12570</a>. Published with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/856/
dc.identifier.articleid 2141
dc.identifier.contextkey 11388860
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/856
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1664
dc.language.iso en
dc.source.uri 10.1111/1752-1688.12570
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Environmental Indicators and Impact Assessment
dc.subject.disciplines Water Resource Management
dc.subject.keywords wetlands
dc.subject.keywords nitrate-nitrogen
dc.subject.keywords tile drainage
dc.subject.keywords SWAT
dc.subject.keywords nutrient reduction
dc.title Evaluation of Existing and Modified Wetland Equations in the SWAT Model
dc.type article
dc.type.genre article
dspace.entity.type Publication
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