VIC model for runoff simulation considering dynamic changes of vegetation root depth
In order to improve the simulation accuracy of the hydrological model under the influence of vegetation change in arid and semi-arid areas,combing with the vertical distribution of plant roots and climate and soil conditions,a method for estimating average root depth in a basin based on underlying surface characteristics such as basin meteorology and soil properties was proposed.With the Wuding River Basin in Loess Plateau region used as an example,a variable infiltration capacity(VIC)model for runoff simulation,considering dynamic changes of vegetation root depth,named VIC-DR model,was constructed.The runoff simulation results of the VIC-DR model were compared with those of the original VIC model with the confluence checking computation,named VIC-R model.The results show that,compared with the VIC-R model,the simulation accuracy of the VIC-DR model was significantly improved.The Nash-sutcliffe efficiency coefficient of the monthly and daily runoff simulation results of the VIC-DR model increased by 10.6％and 8.7％,respectively,the relative error decreased by 15.4％and 5.1％,respectively,and the correlation coefficients between the simulated runoff and measured runoff at monthly scale and daily scale were greater than 0.6.The simulation results of the VIC-DR model accord with the actual situation of the basin,and the model has high applicability.
VIC modeldynamic vegetation root parametersrunoff simulationWuding River Basin
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