SWAT模型在茫溪河流域非点源污染研究中的应用

本研究采用美国农业部农业研究所开发的SWAT模型(Soil and Water Assessment Tool)对茫溪河流域非点源污染进行了模拟研究,构建了适用于茫溪河流域的非点源污染模型,对流域的非点源污染进行了模拟和分析。模拟结果显示:茫溪河流域污染特征以非点源污染为主;东茫溪河水系的泥沙、氮、磷等负荷均大于西茫溪河水系;单位泥沙负荷最大的区域为流域东北部、东部和东南部一带的深丘地区,是茫溪河流域的主要泥沙输出区;氮、磷负荷最大的区域为茫溪河中下游一带的平坝、浅丘地区,是茫溪河流域的主要氮、磷输出区;研究区内泥沙、营养物质的输出具有很强的时间规律,有机氮、有机磷的输出在雨季(6月~9月)会出现高峰,因此雨季是流域内非点源污染源输出的重点时段。

Application Of SWAT Model In Non-point Soure Pollution Simulation of Mangxi Watershed

This study established a non-point source pollution model for Mangxi Watershed and simulated the non-point source pollution source for the watershed by using SWAT model,which was developed by the U.S.Department of Agriculture.The simulation results showed that the pollution characteristic of Mangxi Watershed was mainly non-point pollution.The pollution load of sediment,nitrogen and phosphorus of the east Mangxi river system was heavier than that of the west Mangxi river system.The hilly area in northeast,east and southeast of Mangxi Watershed had the largest unit sediment load,which was the main area of sediment output.The plain and shallow hill area in the middle and lower reaches of Mangxi Watershed has the largest nitrogen and phosphorous load,which was the main area of nitrogen and phosphorous output.There was a strong time rule for the sediment and nutrient output in the studied area.Organic nitrogen and organic phosphorous output peak during the rainy season（between June and September）,so the rainy season was the main period of non-point source pollution output.