Application of SWAT Model in the Study on Non-point Source Pollution in Xincai River Basin

[Objective] The study aimed to simulate the producing and transporting process of flow,sediment and non-point source pollution in Xincai River basin based on SWAT model.[Method] On the basis of analyzing the principles of SWAT model,the correlative parameters of flow and water quality were calibrated,then the spatial and temporal distribution of flow,sediment and non-point source pollution in Xincai River basin were studied using the SWAT model.[Result] The results of calibration and validation showed that the SWAT model was reasonable and available,and it can be used to simulate the non-point source pollution of Xincai River basin.The simulated results revealed that the amount of sediment and various pollutants' load was the highest in the rainy year,followed by the normal year,while it was the minimum in the dry year,which indicated that the production and output of sediment and non-point source pollution were closely related to annual runoff.[Conclusion] The research could provide scientific references for the prevention of non-point source pollution in a basin.