基于GRACE重力卫星的甘肃北山地区地下水储量变化规律研究

Changes of groundwater storage variation based on GRACE data at the Beishan area,Gansu Province

作为我国高放废物地质处置预选区之一的甘肃北山地区,其地下水动态规律研究对于安全地地质处置有着重要的意义。重力反演与气候实验卫星(GRACE)数据可从网上免费获取,为分析区域地下水运动规律提供了可能。利用GRACE数据和全球陆面同化系统(GLDAS)数据反演了甘肃北山地区2003—2012年的地下水储量变化。结果表明:2003—2012年间甘肃北山区域地下水储量变化呈约0.26 cm/a下降趋势,且由西向东方向,地下水储量变幅呈减少趋势;区域地下水储量变化与同时期的降雨量关系不大。采用的基于GRACE-GLDAS的反演方法对于缺乏地下水动态监测数据的区域尺度地下水动态变化分析具有较大的应用潜力。

As one of the preselected areas for Chinese high-level radioactive waste geological disposal,groundwater dynamics at the Beishan area in Gansu Province,is of important significance for the safety of geological disposal. The Gravity Recovery and Climate Experiment（ GRACE） satellite data is freely available from the Internet,and offers the possible analysis of regional groundwater storage variations. Using GRACE and global land data assimilation system（ GLDAS） data,this paper derives the groundwater storage（ GW）variations in the Beishan area in Gansu from the year of 2003 to 2012. The results show that the GW variations is in a decreasing trend of about 0. 258 cm / a. The GW variations decreases from the western regions to the eastern part,and the correlation between GW variation and precipitation at the same period is low. The proposed method using GRACE-GLDAS data to analyze the regional groundwater storage variations has great potential and applicability at the remote regions and large areas lacking groundwater observations.