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以赣江流域为研究区,基于观测降水和TRMM准实时数据(3B42RTV6、3B42RTV7)和分析数据(3B42V6、3B42V7),驱动VIC水文模型,开展卫星降水产品在赣江流域的水文模拟,评估TRMM降水产品在水文模拟中的应用能力。结果表明:(1)在赣江流域,3B42V7估算的降水与实测降水的对比结果最好,3B42RTV6的估算精度最低,3B42RTV7较3B42RTV6在赣江流域的降水估算精度提升非常明显;(2)在径流模拟方面,3B42V6和3B42V7在日尺度上尽管对洪峰的模拟有所偏差,但模拟结果仍能反映径流变化特征,在月尺度上模拟结果精度较高,纳什系数均在0.9以上,并且二者在4、5月的径流模拟结果较好,7、8月的模拟结果较差,而3B42RTV6对径流的模拟能力较差,日径流量和月径流量均呈现明显低估,3B42RTV7对径流的模拟结果比3B42RTV6有明显改善,可以满足实时水文预报的需求。
Taking Ganjiang River Basin as a research area, the VIC hydrological model was driven based on observed precipitation and TRMM quasi-real-time data (3B42RTV6,3B42RTV7) and analysis data (3B42V6,3B42V7) to carry out hydrological simulation of satellite precipitation products in the Ganjiang River basin and evaluate the effects of TRMM precipitation The ability of products to be applied in hydrological simulation. The results show that: (1) In the Ganjiang River basin, the comparison between 3B42V7 estimated precipitation and observed precipitation is the best, 3B42RTV6 has the lowest estimation accuracy, and 3B42RTV7 is more obvious than 3B42RTV6 in precipitation in Ganjiang River. (2) In terms of simulations, the simulated results of 3B42V6 and 3B42V7 on daily scale can still reflect the characteristics of runoff, but the accuracy of simulation results is higher on the monthly scale with the Nash coefficient above 0.9, The results of runoff simulation in April and May are better, and the simulation results in July and August are poorer. However, 3B42RTV6 has poor simulation ability for runoff, both daily runoff and monthly runoff show a significant underestimation. The simulation results of 3B42RTV7 on runoff 3B42RTV6 has been significantly improved to meet the needs of real-time hydrological forecasting.