Study of Non-Point Pollution in the Ashe River Basin Based on SWAT Model with Different Land Use

The Ashe River Basin (ARB), long known as the “Golden Waterway” in Manchu, has become one of China’s most polluted rivers. basin area is 3545 km2 and total length river 257 km. There have not been specific studies on land use change non-point pollution ARB region. This paper uses watershed study area, simulates using SWAT (Soil Water Assessment Tool) model, analyzes hydrological processes temporal spatial changes nitrogen phosphorus with hydrology water quality objectives under different periods to reduce protect environment. results show that simulation runoff, even R2 NS (both coefficient determination Nash–Sutcliffe efficiency are simulated by SWAT-CUP, which generally used validate where closer result 1, better effect) watershed, also all above 0.75 good applicability during regular validation periods. Since 2000, monthly average levels progressively grown. areas concentrated middle lower reaches near main streams owing rise load per unit caused collection pollutants from upper outlet, an increase fertilizer application due larger cultivated land.