SWAT模型在西湖流域非点源污染的模拟研究

Simulation of Non-point Source Pollution of SWAT Model in West Lake Basin

西湖长期面临着以富营养化和生态退化为主要特征的水环境问题,其中非点源污染是影响湖区水质根本改善的重要原因。本研究应用SWAT模型对西湖流域进行了非点源污染模拟,利用2016年和2017年的实测数据对模型进行了校准与验证,径流、总氮和总磷的模拟精度均满足R^2≥0.6、NS≥0.5的评价标准。应用验证后的模型模拟得出西湖流域氮磷负荷,并进一步识别出西湖流域氮磷非点源污染负荷的关键源区。

West Lake has long been confronted with water environment problems characterized by eutrophication and ecological degradation. Non-point source pollution has become an important cause of the fundamental improvement of water quality in the lake area. In this study, the SWAT model was used to simulate non-point source pollution in the West Lake basin. The model was calibrated and validated using measured data from 2016 and 2017, and the simulated accuracy of runoff, total nitrogen, and total phosphorus satisfied R^2≥0.6, NS≥0.5 evaluation criteria. The simulated model was used to simulate the nitrogen and phosphorus loads in the West Lake basin, and the key source areas for non-point source pollution load in the basin were further identified.