基于SBAS-InSAR技术的长沙城区2017-2020年地表沉降监测  

Monitoring ground subsidence in Changsha urban area between 2017-2020 based on SBAS-InSAR

作　　者：徐燕春 李佳[1,2] 吴立新[1,2] 郭磊[1,2] 徐浩栋 XU Yanchun;LI Jia;WU Lixin;GUO Lei;XU Haodong(School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Laboratory of GeoHazards Perception,Cognition and Predication,Central South University,Changsha 410083,China)

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]中南大学地灾感知认知预知研究室,湖南长沙410083

出　　处：《海洋测绘》2021年第5期37-42,共6页Hydrographic Surveying and Charting

基　　金：国家自然科学基金(41904006,41771081,41901295);湖湘高层次人才聚集工程项目(2018RS3013);湖南省自然科学基金(2019JJ50761);中南大学领军人才支持计划(506030101);上海航天科技创新基金(SAST2018-042)。

摘　　要：近年来长沙市由地面沉降导致的地质灾害问题频繁发生。针对这一问题,利用94景Sentinel-1A卫星影像,基于时序SBAS-InSAR技术,获取了长沙市主城区2017年3月~2020年5月间的地表沉降速率和累积形变。估计的地表形变速率与长沙市GPS连续运行参考站观测的地表沉降速率高度吻合。结果表明:在长沙市5个主城区中,开福区地面沉降范围最广,岳麓区和雨花区次之,芙蓉区和天心区沉降区较少;最大累积沉降量达225 mm,平均沉降速率达74 mm/年。研究结果表明长沙市区地面沉降多由地面和地下工程建设引起。Due to ground subsidence, geological hazards occurred frequently in Changsha during the past few years.In this paper, SBAS-InSAR was used to estimate the subsidence rate between March 2017 and May 2020 based on 94 Sentinel-1 A images.The results are consistent with that observed by continuously operating reference stations(CORS) in Changsha.The results showed that, among the five districts of Changsha, the Kaifu district had the vastest subsiding area, followed by the Yuelu and Yuhua districts.The Tianxin and Furong districts are relatively stable.The largest land subsidence is up to 225 mm, and the average subsidence rate is 74 mm/year.The interpretation indicated that land subsidence in Changsha was mainly caused by the heavy ground and underground construction works.

关 键 词：合成孔径雷达干涉测量 地面沉降监测 小基线集 哨兵1号 地面工程建设 

分 类 号：P237[天文地球—摄影测量与遥感]