SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Evaluating the SWAT model to predict streamflow, nitrate loadings and crop yields in a small agricultural catchment 
Authors:Bauwe A., P. Kahle and B. Lennartz 
Journal:Advances in Geosciences 
Volume (Issue):48 
Article ID: 
URL (non-DOI journals): 
Broad Application Category:hydrologic only 
Primary Application Category:nitrogen cycling/loss and transport 
Secondary Application Category:crop, forest and/or vegetation growth/yield and/or parameters 
Watershed Description:1.67 km ^2 drainage area, located near the city of Rostock in northeast Germany. 
Calibration Summary: 
Validation Summary: 
General Comments: 
Abstract:This study aimed to evaluate the applicability of the Soil and Water Assessment Tool (SWAT) to predict streamflow, nitrate loadings and crop yields for a small agri- cultural catchment in northeastern Germany. To this end, a 167 ha catchment was delineated consisting of 10 hydrological response units. Daily data for streamflow and nitrate loadings from 2004 to 2015 were used to calibrate and validate the model, while annual values for crop yields (winter wheat, winter barley, rapeseed, maize silage) were available. In addition, the detailed field maps provided by the local farmer were used to implement exact crop rotations and nitrogen fertilization into the model. Nash-Sutcliffe-Efficiencies for streamflow were 0.54 during the calibration and 0.57 for the validation period. The modeling performance for nitrate loadings were lower with 0.31 for the calibration and 0.42 for the validation period. The average crop yields were re- produced well, while SWAT failed to reproduce the inter- annual crop yield variations. A scenario analysis revealed that a slight decrease of nitrogen fertilization leads to significant reductions in nitrate loadings, while crop yields remained on a high level. The outcome of the study may help practitioners to operate according to an economic and environmental optimal N management. Nevertheless, experimental studies with varying fertilization intensities at catchment scale are needed to underpin the modeling results.