SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Using SWAT-VSA to predict diffuse P pollution in an agricultural catchment with several aquifers 
Authors:Pezet, F., J.-M. Dorioz, P. Quetin, M. Lafforgue and D. Trevisan 
Journal:Journal of Hydrologic Engineering 
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Broad Application Category:hydrologic & pollutant 
Primary Application Category:variable source area/saturation excess hydrology 
Secondary Application Category:model comparison 
Watershed Description:2.5 km^2 Albenche River which flows into Lake Bourget in southeast France 
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Abstract:Recent improvements in the Soil and Water Assessment Tool (SWAT) model take account of hydrological processes controlling a ‘Variable Source Area’ (VSA). This model, SWAT-VSA, accounts for changes in the nature and extent of the VSA over the course of a hydrological cycle by considering global catchment storage capacity, which varies with soil moisture between threshold values whose spatial distribution is determined by topography. The objective of this work is to evaluate the contribution of several aquifers with specific storage capacities to global catchment storage, its dynamics and subsequent effects on VSA and non-point-source pollution. For this purpose, we used a method called SWAT-mVSA (SWAT-multi VSA) in a catchment representative of the agricultural conditions of large peri-Alpine lakes to calculate soluble reactive phosphorus (SRP) fluxes, since SRP has a major influence on receiving waters. SWAT-mVSA predicted components of the hydrological balance and SRP fluxes more accurately than SWAT-VSA. This underlines the importance of VSAs in mobilizing and transporting non-point-source pollutants such as nutrients, pesticides or bacteria. 
Keywords:Variable Source Area, SWAT-VSA, perched aquifers, Curve Number, diffuse pollution