TRMM_3B42 V7 and GPM_IMERG precipitation products hydrological suitability assessment in the source area of the Yellow River
Taking the control basin of different hydrological stations in the source area of the Yellow River as the research unit,this paper evaluates the statistical indicators of GPM_IMERG and TRMM_3B42 V7 on the stations and basins,and uses a distributed hydrological model to evaluate the hydrological utility of the two in the control basin of hydrological stations along the Yellow River.difference.The re-sults show that:(1)In the site comparison study,there is good consistency between 3B42 V7,IMERG and regional station precipitation.IMERG has better accuracy than 3B42 V7,3B42 V7 overestimates pre-cipitation,and IMERG is closer to the norm observation value;The overall precipitation has gradually in-creased from west to east.The watershed controlled by the Jiuzhi hydrological station has the most precipi-tation,and the watershed controlled by the hydrological station along the Yellow River has the least pre-cipitation.(2)In the basin controlled by different hydrological stations,the precipitation spatial changes are significant,but GPM_IMERG can better represent the spatial distribution of precipitation;3B42 V7 and the CC high value of the regional station observation value are distributed in the Tang Naihai control area,and GPM-IMERG and the regional station The high CC values of the observations are widely distrib-uted,and 3B42 V7 has better precipitation capture ability in high-altitude areas.Overall,the accuracy of 3B42 V7 is better than that of IMERG.(3)In terms of hydrological utility evaluation,the 2016-2018 warm season is used as the model rate regularly,the 2019 warm season is the verification period and three simulation scenarios are considered.Scenario Ⅰ is a regional station precipitation-driven hydrological model,and scenario Ⅱ is TRMM_3B42 V7 Precipitation data drives the hydrological model.Scenario Ⅲ is the GPM_IMERG precipitation data-driven hydrological model.The best rate of regular simulation results is driven by measured data.The Nash coefficient is 0.88,scenario Ⅱ is 0.85,and scenario Ⅲ is 0.86.GPM_IMERG is believed to be able to catch the peak flow well adn has a higher potential for flood forecasting.
Yellow River source areaprecipitationassessmenthydrological utility
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