关键词: 卫星降水, 再分析数据, 精度评估, 径流模拟, 滦河流域

Abstract: Satellite precipitation products and multi-source reanalysis precipitation data are of great significance to hydrological simulations. Based on ground observed precipitation data, this study evaluates the spatial and temporal accuracies of the Integrated Multi-Satellite Retrievals for Global Precipitation Measurement (GPM IMERG) dataset and the China Meteorological Forcing Dataset (CMFD) reanalysis precipitation data. By using the Soil & Water Assessment Tool (SWAT) to simulate monthly runoffs, applicability of the two precipitation products is compared. The results show that on multiple time scales, the IMERG data and CMFD data have high correlations with the observed precipitation, with overestimations by 3.7% and 2.6%, respectively; both can well describe the overall trend of precipitation in space but need further improvement on the accuracy of weak precipitation detection. Generally, they are applicable to simulations of the runoff in the Luanhe River basin. The GPM IMERG data can effectively improve the accuracy of runoff simulations for the basins with sparse rainfall stations, manifesting a good application potential in hydrological simulation.

Key words: satellite precipitation, reanalysis data, accuracy evaluation, runoff simulation, Luanhe River basin