Runoff simulation analysis of typical watershed in Tibetan Plateau based on reanalysis precipitation data
A variable infiltration capacity(VIC)model was constructed for the Nyang River above Gengzhang Station on the Tibetan Plateau based on observed precipitation data and reanalysis precipitation data of China meteorological forcing dataset(CMFD)and ERA5-Land.The applicability of reanalysis data and the VIC model in runoff simulation in data-deficient areas was evaluated,and the influence of model resolution on runoff simulation results was explored.The results indicate that,the VIC model based on observations is difficult to reflect actual runoff in the area seriously lacking observations,while the use of reanalysis data can significantly improve the simulation accuracy.Runoff simulation with the VIC model based on ERA5-Land reanalysis data has a higher accuracy than that based on CMFD reanalysis data,achieving a Nash-Sutcliffe efficiency coefficient of 0.76 for monthly runoff simulation results.This demonstrates the suitability of ERA5-Land reanalysis data and the VIC model in runoff simulation in the study area.However,it is necessary to improve the accuracy of peak flow simulation of the VIC model.It is also demonstrated that the runoff simulation accuracy of the VIC model is improved with the increase of model resolution.When the VIC model resolution is increased from 10 km to 1 km,the Nash-Sutcliffe efficiency coefficient for monthly runoff simulation results is increased by 9.1％,and the relative error is decreased by 16.5％.The VIC model with higher resolution is more accurate to simulate the peak appearance time and peak flow,but it is difficult to simulate backwater processes.
万方数据
维普
