Runoff Simulation in Alpine Basin Based on Multiple Conceptual Hydrological Models

Investigation on hydrological simulationsto reveal historical change and future projection of runoff is crucial to rational development and utilization of basin water resources.In this study,the Datong River basin in northeast of the Qinghai-Tibet Plateau is selected as study area,and two experiments of runoff simulation at daily timescale are carried out based on six conceptual hydrological models within the eWater Source platform driven by the CMFD and ERA5-Land meteorological data.In the first experiment,single model is applied to the basin,while in the second experiment,multiple model combinations considering snow and ice are conducted.At the same time,calibrating the parameter set for each sub-basin is considered in each experiment,and the impact of different experiment settings on results is analyzed.Results show that the Nash-Sutcliffe Efficiency coefficient (NSE) of single models (i.e.,GR4J,AWBM,Sacramento,SIMHYD,IHACRES-CMD and GR4JSG) is 0.73,0.74,0.71,0.62,0.75 and 0.80,respectively during the calibration period.The NSE of IHACRES-CMD and GR4JSG model combination in the calibration period is 0.83 and 0.75 at Xiangtang and Qingshizui stations,respectively.Model combination outperforms single model and the result is comparable to those from distributed models applied in the same basin,and thereby is recommended in this study.