Applicability of Runoff Simulation in the Zhanghe Upstream Based on SWAT Model

Sequential Uncertainty Fitting-2 (SUFI-2) with ArcSWAT2009 was used to test the performance of SWAT model for predicting runoff in the Zhanghe upstream. Parameter calibration and distributed hydrologic model building for the Zhanghe upstream were performed by coupling manual and auto-calibration methods. Monthly simulation values of R-2 and NSE were 0.83 and 0.79 during the calibration period, and 0.83 and 0.76 during the validation period, respectively. The results showed that SWAT model could be successfully used to model long-term continuous runoff in the study area. The calibrated model can be used for further analysis of the effects of the climate and land use change, water quality analysis and sediment yield analysis.