多源降水产品在不同气候带的水文模拟评估

Using NOAA-CPC-US precipitation products as a reference, eight watersheds in different climatic zones in the United States were selected. Through comparative analysis, the accuracy of satellite precipitation PERSIANN and GPM-IMERG, radar precipitation StageIV, and the fifth-generation ECMWF atmospheric reanalysis global climate data ERA5 were evaluated. Then, five types of precipitation data driven distributed hydrological models (CREST) were used to evaluate their utility in runoff simulation. The results show that radar precipitation StageIV has the best precipitation estimation accuracy in eight different climatic zones, followed by GPM-IMERG and PERSIANN satellite precipitation and ERA5 climate model precipitation. In runoff simulation, Stage IV and NOAA-CPC-US perform well in watersheds in different climatic zones, which can meet the hydrological simulation needs of watersheds in different climatic zones. The rainfall-runoff simulation capabilities of precipitation GPM-IMERG and PERSIANN is not consistent in different climate zones, and the stability is not high. The climate zone located in low latitudes is better than that in high latitudes.In general, the precipitation GPM-IMERG is better than PERSIANN and these two precipitation products need to be further verified when used in hydrological simulation. The hydrological simulation effect of ERA5 precipitation is not atisfactory and cannot support the hydrological simulation of small watersheds in different climatic zones.