永久散射体差分干涉测量和小基线集技术在常州地面沉降分析中的应用

摘要

The phenomenon of land subsidence in the large-medium cities is universal,which brings great threat for the urban building,infrastructure,underground space construction and so on,and brings the hidden trouble to the people's production,life and safety.In order to prevent the disaster caused by urban land subsidence in time,this paper uses the persistent scatters InSAR (PS-InSAR) and small baseline subset(SBAS) technology to monitor the land subsidence in Wujin district of Changzhou city,the distribution map and the settlement value of the main subsidence area in Wujin area are obtained respecively.Finally,combined with the local level data,we can obtain the average error by PS-InSAR and SBAS technology are all less than 2.3mm/a,the root mean square error are all less than 4.4mm/a.That proves that the monitor accuracy of land subsidence by PS-InSAR and SBAS technology in this area can reach millimeter level,the two technologies all can be used in urban land subsidence monitoring.%当前大中型城市普遍存在地面沉降的现象,地面沉降会给城市建筑、基础设施、地下空间建设等带来巨大的威胁,从而给人民群众生产、生活及生命安全带来隐患.为了可以及时预防城市地面沉降带来的灾害,该文采用较为前沿的永久散射体差分干涉测量(PS-InSAR)和小基线集(SBAS)技术分别对常州市武进区的地面进行沉降监测,分别得到了武进区的主要沉陷区分布图和沉降值大小.最后结合当地水准数据得到PS-InSAR与SBAS技术的平均误差均小于2.3mm/a,均方根误差小于4.4mm/a,从而证明了PS-InSAR与SBAS技术监测该地区的地面沉降精度达毫米级是可行的,两种技术都可以应用到城市地面沉降监测中.