渠溪河流域GPM IMERG卫星降水对地面站点降水的可替代性研究

为评估IMERG卫星降水产品在空间覆盖范围、时空分辨率、雨雪数据观测等方面较上一代产品TMPA的改进效果,以三峡区间渠溪河流域为例,选择地面实测雨量数据作为参考值,在对IMERG产品进行统计分析评估的基础上,进一步运用BTOPMC分布式水文模型对其进行水文适用性评估,探讨IMERG卫星降水对实测降水GAUGE的可替代性,并选择TMPA产品进行了对比。结果表明,IMERG在渠溪河流域精度较高、水文表现较好,具有替代地面站点观测数据的潜力。

Study on Substitution of GPM IMERG Satellite Precipitation for Ground Station Precipitation in Quxi River Basin

IMERG, as the successor of TMPA, provides greater coverage, higher spatial and temporal resolution, more accurate capture of solid precipitation and light precipitation. On the basis of statistical analysis and evaluation, the BTOPMC distributed hydrological model is further applied to evaluate the accuracy of the new generation of satellite precipitation product IMERG in the Quxi River basin of the Three Gorges Region, to explore the substitution of IMERG satellite precipitation for ground station precipitation. The previous generation product TMPA is selected for comparison. The results show that IMERG has high precision and good hydrological performance in the Quxi River basin and has the potential to replace the surface stations to observation data.