基于PS-InSAR技术的天津市地表沉降监测与分析

Monitoring and Analysis of Ground Subsidence in Tianjin Based on PS-InSAR Technology

为了获取大范围的地表沉降信息,文章选取天津市西南部区域为实验区,以2009年3月至2010年12月的高分辨率TerraSAR-XSAR时序影像为实验数据,研究使用PS-InSAR技术进行实验区的地表沉降监测。首先基于PS-InSAR技术获取了该区域地表沉降的分布与速率信息;然后以水准点的测量结果为参考,验证PS-InSAR方法的精度和有效性;最后对造成地表沉降的原因进行了深入分析。结果表明,利用PS-InSAR技术能够有效地获取天津市西南部地区的地表沉降信息,并得出其沉降主要是地壳运动等自然因素和地下水开采、地表建设等人类活动引起的结论。

For obtaining a wide range of surface subsidence information,the southwestern part of Tianjin was selected as the experimental area.The corrected TerraSAR-X SAR time series images from March 2009 to December 2010 were used as experimental data.The aim is to investigate the surface subsidence in the experimental area by using PS-InSAR technology.Above all,the PS-InSAR technique obtains the distribution and rate information of the surface subsidence in the region.Then the accuracy of the PS-InSAR method is verified by reference to the measurement results of the benchmark.Finally,the results of the surface subsidence show that the PS-InSAR technology is effective in obtaining the surface substitution information in the southwestern part of Tianjin.Besides,the subsidence is mainly caused by natural factors such as crustal movement,or human activities such as underground mining and surface construction.