InSAR填海区地铁沿线地表沉降反演分析

Land subsidence inversion analysis along the subway in the reclamation area based on InSAR

为了更好地监测和掌握深圳填海区地铁工程结束后地铁沿线的地面沉降情况,该文利用TS-InSAR技术和20景2017年8月15日—2019年3月14日的Sentinel-1A SAR数据,借助POD精密定轨星历和ASTER GDEM V2分别去除轨道误差和地形相位,反演了深圳填海区2017—2019年地表沉降时间序列,并在此基础上重点分析了填海区地铁沿线地面沉降的时空演变规律以及地面沉降成因。结果显示,填海区各地铁沿线的地面沉降特征较为明显,最大沉降速率为-17.52 mm/a。其中,宝安中心、前海湾、深圳湾区段地铁沿线的地面沉降趋势较为严重,其地面沉降呈现逐渐增强和扩散趋势。

In order to monitor and grasp the land subsidence along the subway line after the completion of the Shenzhen reclamation area subway project,based on time-series interferometry synthetic aperture radar(TS-InSAR)technology and 20 scenes of Sentinel-1 ASAR data from August 15,2017 to March 14,2019,this paper used POD precise orbit ephemerides and ASTER GDEM V2 to remove the orbital error and the terrain phase,respectively.The land subsidence time series of Shenzhen reclamation from 2017 to 2019 were obtained.On this basis,the paper analyzed the temporal and spatial evolution of land subsidence along the subway in the reclamation area and the causes of land subsidence.The results showed that the surface settlement characteristics of the subways along the reclamation area were more obvious,the maximum subsidence rate was-17.52 mm/a.Among them,the land subsidence trend along the subway lines in Baoan Center,Qianhai Bay and Shenzhen Bay Section was more serious,and its land subsidence was gradually increasing and spreading.