SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Identification of critical source areas of nitrogen load in the Miyun Reservoir Watershed under different hydrological conditions 
Authors:Guo, Y., X. Wang, L. Zhou, C. Melching and Z. Li 
Volume (Issue):12(3) 
Article ID:964 
URL (non-DOI journals): 
Broad Application Category:hydrologic & pollutant 
Primary Application Category:critical source area assessment 
Secondary Application Category:nitrogen cycling/loss and transport 
Watershed Description:4,888 km^2 Chaohe River, which originates in the Fengning Manchu Autonomous County of Hebei Province, flows through Luanping County and Beijing Miyun District, and finally flowing into Miyun Reservoir near the Beijing Metropolitan Area in northeast China. 
Calibration Summary: 
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General Comments: 
Abstract:The spatiotemporal distribution of critical source areas (CSAs) will change with hydrological conditions. In this study, the CSAs of nitrogen load under different hydrological conditions in the Chaohe River watershed were identified using the cumulative pollution load curve method determined from the nitrogen pollution simulated using the Soil and Water Assessment Tool (SWAT) model. The results showed that: (1) The order of factors impacting nitrogen load intensity is as follows: fertilization intensity, rainfall, runoff, land use type, slope type, and soil type. (2) The primary and secondary CSAs are concentrated in the upper and lower areas of the watershed, where cultivated land (8.36%) and grassland (52.55%) are more abundant. The potential pollution source areas are concentrated in the upper and middle areas of the watershed, where cultivated land (6.99%), grassland (42.37%), and forest land (48.18%) are evenly distributed. The low-risk source areas are concentrated in the middle and left bank of the watershed, where forest land (67.65%) is dominant and the vegetation coverage is highest. The research results have significance for improving the accuracy of the implementation of best management practices, and can provide a reference for the formulation of drinking water protection policies for Beijing. 
Keywords:Chaohe River watershed; nitrogen load; SWAT model; cumulative pollution load curve method; hydrological conditions; Critical source area