SBAS-InSAR解译福州市地表沉降时空变化研究

Spatiotemporal variation of surface subsidence in Fuzhou interpreted by SBAS-InSAR

针对传统小基线集干涉测量技术在获取南方海滨型城市地面沉降信息时受大气影响较大的问题,在其基础上使用通用大气校正在线服务,去除大气相位,获取福州市市区地面沉降空间分布特征,并利用InSAR Stacking技术反演了研究区的沉降速率。选取覆盖研究区48景Sentinel-1A影像数据,以及相应时间的GACOS数据,获取2017—2019年的福州市市区地面沉降信息。结果表明:福州市市区存在6个沉降区,最大沉降速率为-19.2mm/a,属于义序高速公路项目的建设范围;其他沉降区均分布在地铁站及建筑密集区,最大沉降量达到-50mm,温泉保护区已处于相对稳定状态;道路施工、地铁的建设、地下水的开采以及断层带的活动可能对福州市市区地面沉降有一定的影响。

Aiming at the problem that the traditional small baseline set interferometry technology is greatly affected by the atmosphere when acquiring the land subsidence information of southern coastal cities.In this study,we use the Generic Atmospheric Correction Online Service(GACOS)to remove the atmospheric phase based on it.Obtain the spatial distribution characteristics of land subsidence in the urban area of Fuzhou,and use InSAR(Interferometric Synthetic Aperture Radar)stacking technology to invert the subsidence rate of the study area.Select the Sentinel-1Aimage data covering 48scenes in the study area and the GACOS data at the corresponding time to obtain the land subsidence information of the urban area of Fuzhou from 2017to 2019.The results show that there are 6subsidence areas in the urban area of Fuzhou,with a maximum subsidence rate of-19.2mm/a,which belongs to the construction scope of Yixu Expressway Project;other subsidence areas are distributed in subway stations and densely constructed areas,and the maximum subsidence reaches-50mm.The hot spring reserve is already in a relatively stable state.Road construction,subway construction,groundwater extraction,and fault zone activities may have a certain impact on land subsidence in the urban area of Fuzhou.