北京平原区地面沉降PS-InSAR监测

Land Subsidence Monitoring in Beijing Plain with PS-InSAR Techniques

地面沉降是北京平原区的主要地质灾害之一。针对地下水长期超量开采引发的大范围地面沉降,采用雷达遥感的技术方法对其进行监测分析:以2003~2010年间覆盖北京的31景ENVISAT ASAR数据为基础,采用永久散射体干涉测量技术对北京市平原区进行长时间序列的地面沉降监测,并对比地下水水位变化数据,通过GIS空间分析的方法讨论地面沉降的时空演化特征。结果表明:2003~2010年,北京市平原区地表形变速率范围为-52.1~8.2mm/yr,已经形成五大沉降漏斗(朝阳—通州沉降漏斗、天竺—金盏沉降漏斗、来广营沉降漏斗、高丽营沉降漏斗和昌平沉降漏斗),地面沉降发生区域与地下水漏斗形成区域基本一致。

Land subsidence is one of the most important geological hazards in Beijing Plain,as long-term over-exploitation of groundwater,its scope and magnitude have been growing over the past few decades.Choosing 31 ENVISAT ASAR images covering plain area of Beijing,China,the paper employed Persistent Scatterers InSAR to detect and characterize spatiotemporal changes of ground subsidence.The comprehensive analysis results indicate that:PS-InSAR monitoring results on land subsidence are reliable,comparing with the leveling monitoring results.Deformation results show that the deformation velocity in the study area range from-52.1to +8.2 mm/yr.The main subsidence area is distributed into five subsidence bowls(Chaoyang—tongzhou Bowl,Tianzhu—jinzhan Bowl,Laiguagnying Bowl,Gaoliying Bowl and Changping Bowl).Combining the change of groundwater and surface deformation during 2003 to 2010,this study found that land subsidence and the falling of groundwater levels have a very high spatial correlation.