时序InSAR技术在合肥市地面沉降监测中的应用

Application of Land Subsidence Monitoring of Hefei Based on Time-series InSAR Technique

随着城市建设的发展,地面沉降也愈发严重,而长期的地面沉降会引发自然灾害。以2017年9月~2019年12月的27景Sentinel-1A卫星升轨数据为数据源,利用时序InSAR技术对合肥市进行了地表沉降监测,结果表明:在监测时段内,研究区整体地面形态较为稳定,并未出现大面积的沉降漏斗,形变速率集中在-8.1 mm/a^7.9 mm/a之间,局部地区出现地面沉降。基于监测的形变结果,对合肥地铁3号线及合宁客运专线的形变情况进行了研究。地铁3号线在西七里塘站至幸福坝站路段出现连续的地表沉降,沉降速率在-11.2 mm/a^-0.1 mm/a之间。合宁客运专线在肥东县境内沉降严重,沉降速率在-16.6 mm/a^-0.2 mm/a之间。

With the development of urban construction,land subsidence is becoming more and more serious,and long-term land subsidence will cause natural disasters.The paper taking the analysis of the time series of Hefei city through 27 sentinel-1A images from september 2017 to december 2019 used PS and SBAS technique.The result illustrates that the study area was steady from september 2017 to december 2019 and without large-scale settlement funnel.The average subsidence rates between-8.1mm/a and 7.9mm/a and some departmental area appear land subsidence.Based on the obtained deformation results,this paper also studies the subsidence along the subway line 3 in Hefei city.The continuous surface subsidence occurred in the section between West Qi Li Tang Station and Happiness Dam station,and the settlement rate is between-11.2mm/a and-0.1mm/a.The subsidence in Feidong county of He Ning passenger dedicated line is serious,and the surface deformation rate is in the range of-16.6mm/a^-0.2mm/a.