SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Utility of remotely sensed evapotranspiration products to assess an improved model structure 
Authors:Lee, S., J. Qi, H. Kim, G.W. McCarty, G.E. Moglen, M. Anderson, X. Zhang and L. Du 
Volume (Issue):13(4) 
Article ID:2375 
URL (non-DOI journals): 
Broad Application Category:hydrologic only 
Primary Application Category:evapotranspiration assessment 
Secondary Application Category:hydrologic assessment 
Watershed Description:220 km^2 Tuckahoe Creek, a tributary of the Choptank River, located on the Delmarva Peninsula and within the Chesapeake Bay drainage area, in northeast Maryland, U.S. 
Calibration Summary: 
Validation Summary: 
General Comments: 
Abstract:There is a certain level of predictive uncertainty when hydrologic models are applied for operational purposes. Whether structural improvements address uncertainty has not well been evaluated due to the lack of observational data. This study investigated the utility of remotely sensed evapotranspiration (RS-ET) products to quantitatively represent improvements in model predictions owing to structural improvements. Two versions of the Soil and Water Assessment Tool (SWAT), representative of original and improved versions, were calibrated against streamflow and RS-ET. The latter version contains a new soil moisture module, referred to as RSWAT.We compared outputs from these two versions with the best performance metrics (Kling–Gupta Efficiency [KGE], Nash-Sutcliffe Efficiency [NSE] and Percent-bias [P-bias]). Comparisons were conducted at two spatial scales by partitioning the RS-ET into two scales, while streamflow comparisons were only conducted at one scale. At the watershed level, SWAT and RSWAT produced similar metrics for daily streamflow (NSE of 0.29 and 0.37, P-bias of 1.7 and 15.9, and KGE of 0.47 and 0.49, respectively) and ET (KGE of 0.48 and 0.52, respectively). At the subwatershed level, the KGE of RSWAT (0.53) for daily ET was greater than that of SWAT (0.47). These findings demonstrated that RS-ET has the potential to increase prediction accuracy from model structural improvements and highlighted the utility of remotely sensed data in hydrologic modeling. 
Keywords:hydrologic model; predictive uncertainty; model structure improvements; remotely sensed evapotranspiration products