基于SBAS-InSAR技术的武安塌陷区形变监测分析

Deformation Monitoring of Subsidence Areas in Wu′an City Based on SBAS-InSAR Technology

武安市铁、煤等矿产资源的大量开采导致区内地面塌陷严重。该文采用小基线集合成孔径雷达干涉测量(SBAS-InSAR)技术,对武安市2016年10月-2017年3月与2017年10月-2018年3月各15景Sentinel-1A影像数据进行干涉与反演,分别提取两时段的地表累积形变量。结果发现:1)反演塌陷区的分布范围与固镇—武安—矿山—綦村成矿带和鼓山—洪山—新城成矿带相一致,呈典型的带状分布;2)对比两时段形变量,塌陷区的最大和平均形变量均出现降低,表明研究区地面塌陷有向好发展趋势;3)M1和M2分区中塌陷区范围、累积形变量和形变速率均比M3分区大,建议对M1、M2分区加强监测,更好地为塌陷区灾变的早期预警提供科学支撑。

The massive mining of coal,iron ore and other mineral resources in Wu′an City led to serious ground collapse and deformation.In this paper,the SBAS-InSAR technology was used to carry out the interference and inversion processings,to extract accumulative surface deformation results from 30 scenes of Sentinel-1A images cover Wu′an City from October 2016 to March 2017 and from October 2017 to March 2018.The monitoring results are shown as follows.1)The inversed subsidence areas were located in the metallogenic belts of Guzhen-Wu′an-Kuangshan-Qicun and Gushan-Hongshan-Xincheng with a regular ribbon pattern.2)The gradually decrease of both the max and average deformation values in the two periods indicated that the subsidence problem in the study area was getting better.3)Compared with M3 sub-region,the range,accumulative deformation and deformation rate of subsidence areas in M1 and M2 sub-region were relatively larger.It is recommended that government departments strengthen continuous systematic monitoring of these two sub-regions to provide scientific support for early warning of geohazards.