TRMM卫星降水数据在小尺度流域的评估与应用

Application of TRMM Satellite Precipitation Data in Small-scale Watershed

选取史灌河流域上游黄泥庄站以上集水区域为研究流域,以地面站点观测为基准数据,评估TRMM 3B42V7版本卫星降水数据的精度,并采用上述两种降水数据驱动栅格型新安江模型,模拟黄泥庄站日径流和月径流过程。结果表明：2001~2010年TRMM 3B42V7降水数据与雨量站数据累积量的偏差不大,仅为1.71%,但相关系数较低,采用TRMM降水数据模拟的日径流能基本再现黄泥庄站的日径流过程,但对洪峰的模拟精度较低;TRMM月降水数据精度较高,相关系数为0.96,能够较为精确地模拟黄泥庄站的月径流过程。

In this study, the area controlled by the Huangnizhuang Station in the upper Shiguanhe River Basin was selected as the study area. TRMM 3B42V7 precipitation data set covering the study area was evaluated via comparison with the rain gauge obser- vations. These two precipitation data sets were then adopted to drive the grid-based Xinanjiang Model to perform streamflow simu- lation. The results show that the daily streamflow simulation fed with TRMM daily precipitation data could basically represent the daily streamflow processes at the Huangnizhuang Station, though disagreement exists between TRMM daily precipitation and rain gauge precipitation data set. TRMM monthly precipitation was comparatively more accurate, which could be employed to simulate the monthly streamflow simulation at the Huangnizhuang Station.