Simulation of runoff process and variation characteristic in Shaying River basin
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Abstract:
The groundwater recession curve in the Shaying River basin is fitted and compared by linear and nonlinear relatio ships. Based on the improved SWAT(soil and w ater assessment tool) model, the runoff process of the Shaying River basin was simulated, and the simulation effect was evaluated by the Nash Sutcliffe efficiency coefficient, percentage deviation, and determination coefficient. On this basis, the annual and interannual variation characteristics of the runoff process w ere analyzed. The results show that: the non-linear fitting of the groundwater recession curve in the Shaying River basin was better than the linear fitting, and the simulation results of the model based on the non-linear process were good; the surface runoff, the interflow, and the baseflow accounted for 55.5%,25.4%, and 19.1% of the runoff, respectively, the runoff in winter was mainly supplied by the baseflow, the annual distribution of runoff was consistent with the change of precipitation,with obvious seasonal change and nonuniformity; the fluctuation of surface runoff and baseflow is consistent with the change of runoff, showing an upward trend, while the interflow shows a do wnward t rend from 1961 to 2014.
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