再分析数据在玛纳斯河径流模拟中适用性研究OA北大核心CSTPCD

Meteorological data is a crucial factor in the study of hydrological processes.However,due to the com-plex terrain,meteorological stations in the upper reaches of the basin are scarce,limiting the study of hydrologi-cal processes in the basin due to the lack of measured data.This paper takes the Manas River Basin,Xinjiang,China as the research area and selects ERA5-Land,CMFD,and CFSR reanalysis data for analysis.The SWAT model,based on physical processes,and the AdaBoost model,based on data-driven approaches,are constructed to verify the applicability of different datasets in runoff simulation for two types of hydrological models.The Nash efficiency coefficient(NSE)and the determination coefficient(R2)are selected for quantitative analysis.The results show that:(1)The performance of the datasets in the AdaBoost model is better than that in the SWAT model.During the verification period,the NSE and R2 of the ERA5-Land dataset increased by 4％and 2％;the NSE and R2 of the CFSR dataset increased by 14％and 15％;the NSE and R2 of the CMFD dataset changed by-10％and 8％.The NSE and R2 of the meteorological station data increased by 8％and 10％.For datasets lack-ing data,the AdaBoost model is more applicable due to fewer restrictions on input data.(2)In the AdaBoost mod-el,the simulation accuracy of all datasets decreased to a certain extent during the validation period,with CMFD showing the most significant decrease and ERA5-Land the least.These results indicate that the generalization ability of the AdaBoost model is weak.(3)Using ERA5-Land,CFSR,CMFD,and meteorological station data as inputs for the AdaBoost model,the simulation results show that ERA5-Land achieved good results during the ver-ification period.The simulation accuracy of CFSR is comparable to that of meteorological stations,while CMFD performed the worst due to its inaccurate description of meteorological data in the mountainous area of the Manas River Basin.The reanalysis dataset ERA5-Land can provide a reference for runoff simulation in arid areas with insufficient measured meteorological data in northwest China.