Assessment of Applicability of Non-point Source Pollution Along Gantangjiang River Basin Based on SWAT Model

Abstract

Abstract Gantangjiang River Basin was took as the object of study on non-point source pollution to establish a non-point source pollution model applicable to Gantangjiang River Basin based on SWAT model theory and make assess the applicability of the model. The relative error Res of monthly mean value was less than 25%, the monthly correlation coefficient R2 ranged from 0.72 to 0.89, and the monthly efficiency coefficient Ens was not less than 0.5, with a good fitting effect. This study demonstrated that it was feasible to simulate the non-point source pollution along the Gantangjiang River Basin, based on SWAT model. The simulation result showed that the load capacity of non-point source pollution in knowable basin changed in an irregular "W" trend as months went by. The rainfall intensity and capacity influence the pollution load in a certain extent.