Runoff simulation in Donghe basin using SWAT model

Most studies and applications based on SWAT model were in monthly or yearly time step. This study made an attempt to validate the adaptability of runoff simulation in the Three Gorges Reservoir areas in daily time step. By using the soil map (1:50,000), land-use map (1:50,000) in Kaixian, and weather data at Wanzhou station, the related databases were first constructed, and then a simulation was made. The result was evaluated by Nash-Sutcliffe (Ens) and correlation coefficient (r). Using flow data at Wenquan station, the model was calibrated with Ens (0.98), r (0.99). The values of Ens (0.91) and r (0.98) in validation period indicate the simulation result is acceptable and demonstrate that the SWAT model could get a good simulation in daily as well as in monthly time step under some conditions.