IGSNRR OpenIR
DEVELOPMENT OF A COUPLED WATER QUALITY MODEL
Wang, L.1; Flanagan, D. C.2; Cherkauer, K. A.3
2017
Source PublicationTRANSACTIONS OF THE ASABE
ISSN2151-0032
Volume60Issue:4Pages:1153-1170
Corresponding AuthorWang, L.(wanglili959@gmail.com)
AbstractNonpoint-source (NPS) pollutants, especially from agriculture, continue to be a primary source of water quality degradation problems. Effective land management decisions at the field scale must be made to minimize nutrient losses that could pollute streams. Existing NPS models often cannot directly estimate the impacts of different land management practices or determine the effectiveness of combined best management practices (BMPs) in a distributed way at the farm scale. In many cases, they rely on application of the Universal Soil Loss Equation (USLE) or its improved versions, which represent fields in a lumped fashion and use empirical rather than process-based modeling methodologies. In this study, a coupled Water Erosion Prediction Project and Water Quality (WEPP-WQ) model was completed, updated, improved, and evaluated for simulation of hydrology, soil erosion, and water quality. The WEPP model is a well-established process-based model that simulates runoff and erosion processes from a hillslope. The water quality components are based on those of the Soil and Water Assessment Tool (SWAT). A single overland flow element (OFE) on a hillslope is used to represent a single soil and land use management. The WEPP-WQ model was tested by comparing simulated values from the coupled model with observed nutrient and sediment concentrations in surface runoff following storm events at experimental sites near Waterloo in northeastern Indiana and at the Throckmorton Purdue Agricultural Center in west central Indiana. Time series evaluation of the WEPP-WQ model was performed with observed nutrient and sediment losses from an experimental plot near Tifton, Georgia. The model performed quite well in simulating nutrient losses for single storm events, with R-2 greater than 0.8, Nash-Sutcliffe efficiency (NSE) greater than 0.65, and percent bias (PBIAS) less than 31% for runoff, sediment, nitrate nitrogen, total nitrogen, soluble phosphorus, and total phosphorus losses. In predicting time series nutrient loss, the WEPP-WQ model simulated daily nitrate nitrogen losses adequately, with the ratio of the root mean square error to the standard deviation of measured data (RSR) less than 0.7, NSE greater than 0.55, and PBIAS within the range of +/- 40%. Comparisons between simulated soluble phosphorus, total phosphorus, and literature results were performed due to the absence of an available observational dataset. The WEPP-WQ model with a single OFE in this study provides a basic but important step for the development of WEPP-WQ models with multiple OFEs that can evaluate the effectiveness of BMPs.
KeywordModeling Nitrogen Phosphorus Soil erosion Water quality WEPP
DOI10.13031/trans.12002
WOS KeywordNUTRIENT LOSSES ; CONSERVATION TILLAGE ; SURFACE RUNOFF ; OVERLAND-FLOW ; SOIL-EROSION ; WEPP MODEL ; SEDIMENT ; INFILTRATION ; VALIDATION ; NITROGEN
Indexed BySCI
Language英语
Funding Project[41271048]
WOS Research AreaAgriculture
WOS SubjectAgricultural Engineering
WOS IDWOS:000408589300013
PublisherAMER SOC AGRICULTURAL & BIOLOGICAL ENGINEERS
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Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/61856
Collection中国科学院地理科学与资源研究所
Corresponding AuthorWang, L.
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing, Peoples R China
2.ARS, USDA, Natl Soil Eros Res Lab, W Lafayette, IN USA
3.Purdue Univ, Dept Agr & Biol Engn, W Lafayette, IN 47907 USA
Recommended Citation
GB/T 7714
Wang, L.,Flanagan, D. C.,Cherkauer, K. A.. DEVELOPMENT OF A COUPLED WATER QUALITY MODEL[J]. TRANSACTIONS OF THE ASABE,2017,60(4):1153-1170.
APA Wang, L.,Flanagan, D. C.,&Cherkauer, K. A..(2017).DEVELOPMENT OF A COUPLED WATER QUALITY MODEL.TRANSACTIONS OF THE ASABE,60(4),1153-1170.
MLA Wang, L.,et al."DEVELOPMENT OF A COUPLED WATER QUALITY MODEL".TRANSACTIONS OF THE ASABE 60.4(2017):1153-1170.
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