利用GRACE重力卫星监测黑河流域水储量变化

Monitoring Water Storage Variations in the Heihe River Basin by the GRACE Gravity Satellite

利用CSR数据中心公布的GRACE重力测量卫星最新数据RL04,经去相关和Fan滤波处理去除误差,提高结果精度,最终反演得到黑河流域2002～2008年水储量变化趋势,并对其进行时序特征和空间分布特征分析。结果表明:黑河流域水储量有明显的季节变化,水储量增加的最大幅度出现在夏季,减少的最大幅度出现在冬季;总体上水储量呈逐年上升趋势,水储量极值与降水极值具有较明显的一致性;水储量在空间上的分布受流域地形影响显著,上、中游水储量呈增加趋势,下游水储量部分地区减少,部分地区增加。

Using the latest data of GRACE gravity satellites—RL04,published by the CSR,we got the trend of water storage in the Heihe River Basin（HRB） through 2002~2008.In order to improve the inversion accuracy,errors were removed from the data by decorrelation and Fan Filter.Then we analyzed temporal and spatial distribution of water storage variations in the HRB.Results revealed that water storage of HRB features with obviously seasonal characteristic.The amplitude peak of increasing is in summer and declining in winter.Inter-annual analysis showed HRB water storage appears an increasing trend,which is consistent with that of precipitation variations in HRB.Spatially,water storage is greatly influenced by the terrain in HRB,resulting in an increasing trend in the upstream and midstream areas,while a decreasing trend in a part of the downstream area,increasing in other parts.