GRACE卫星数据在海河流域地下水年开采量估算中的应用

结合GRACE卫星数据和全球陆面数据同化系统GLDAS数据,反演了2004—2009年连续72个月的海河流域地下水储量变化。在此基础上,结合2004—2009年海河流域水资源公报的降水量、地下水开采量数据,建立了地下水年开采量与GRACE地下水储量年变化、年降水量的二元回归模型。利用GRACE卫星数据和GLDAS数据反演的地下水储量年变化与由地下水位观测数据计算出的地下水储量年变化相关性较强,其R2为0.804;基于GRACE地下水储量年变化数据与年降水量数据,对地下水年开采量的估算结果良好,建立的回归模型的R2为0.787,表明利用GRACE卫星数据对地下水年开采量进行估算是可行的,是传统地面调查的良好补充。

Estimation of annual groundwater exploitation in Haihe River Basin by use of GRACE satellite data

By means of the gravity recovery and climate experiment(GRACE) satellite and the global land data assimilation system(GLDAS),the change of groundwater storage in the Haihe River Basin over 72 consecutive months from 2004 to 2009 was investigated.On such a basis,a binary regression model for groundwater exploitation,the annual change of groundwater storage,and annual rainfall of the GRACE satellite was established based on the previously published data of rainfall and groundwater exploitation in the Haihe River Basin from 2004 to 2009.The change of groundwater storage derived from the GRACE and GLDAS data has a good correlation with the observed data,and the R2 is 0.804.Based on the annual data of change of groundwater storage and the annual rainfall data of the GRACE satellite,the estimated results of the groundwater exploitation are satisfactory,and the R2 of the binary regression model is 0.787,indicating that using the GRACE satellite data to estimate the groundwater exploitation is feasible and is a good complementary evaluation method for the traditional terrestrial investigation.