基于InSAR的北京市平原区地下水动态监测

北京市平原地区由于长期的地下水开采,导致该地出现地表沉降的地质问题,为实现将InSAR技术应用于地下水的动态监测,采用北京市2007～2010年16景ENVISAT-ASAR数据,利用小基线集技术(small baseline subset,SBAS),得到北京市2007～2010年地表沉降信息,并结合地下水水位埋深数据构建了地下水监测的线性回归方程.得到以下结论:(1)2007～2010年期间,北京市平原区的沉降开始于朝阳区,向四周扩散,且一直在持续;(2)地下水开采与地面沉降正相关;(3)根据地下水与沉降信息构建的三次线性方程,相关性系数最高可到达0. 797;(4)沉降量与GRACE监测的地下水变化具有极高的相关性,因此可以根据GRACE反映的地下水的变化与累积沉降量的相关关系进行空间的降尺度,以提高GRACE数据反映地下水的空间分辨率。

Dynamic Monitoring of Groundwater in the Plain Area of Beijing Based on InSAR

Due to the long-term underground water exploitation in Beijing plain area, the geological problem of land surface subsidence is caused, in order to realize the application of InSAR technology in the dynamic monitoring of groundwater, the Envisat-asar data of Beijing 2007-2010 years is adopted, using the small baseline set technique (Small Baseline Subset,sbas), obtained the land subsidence information of Beijing for 2007-2010 years, and constructed the linear regression equation of groundwater monitoring based on the groundwater level buried data, and got the following conclusions: The settlement of Beijing Plain was started in Chaoyang District from 2007 to 2010. , spreading around and continuing; (2) Groundwater exploitation has positive correlation with ground subsidence, (3) Three linear equations based on groundwater and subsidence, R2 the highest reachable 0.797; (4) The settlement amount is highly correlated with the groundwater variation monitored by grace, so the spatial resolution of the groundwater can be improved by grace data according to the relationship between the groundwater change and accumulative settlement.