The Runoff Simulation of SWAT Model in Yaoxiang Small Watershed

The SWAT model developed by the United States department of agriculture(USDA) agricultural research center in1994 is a strong physical mechanism Watershed hydrological model. It can accurately simulate and predict the different underlying surface runoff. In this paper, we take Yaoxiang Small Watershed in Mount tai as the research object. We study on the daily runoff of Yaoxiang small watershed in 2013 by SWAT model. The results show that on a regular basis and validation period, the simulation rate relative errors(Re)are 4.5% and 7%, correlation coefficients(R2) are 0.72 and 0.85,Nash Suttcliff efficiency coefficients are 0.78 and 0.87. Model simulation accuracy is higher than the evaluation criteria(Ens0.5,R20.6).This conclusion explains that the SWAT model is suitable for the small watershed, and simulation result is better. So it can be applied to a variety of simulated runoff associated with the small watershed. It also can be used to studying the ecological health of the region.