基于SBAS-InSAR的东营市地表形变监测

Surface Deformation Monitoring in Dongying City Based on SBAS-InSAR

摘要: 东营市位于山东省北部黄河三角洲地区，地表沉积层的自然压实、地下资源的开发以及城市建设等活动会导致该地区的地表沉降，严重区域的形变速率可达−100 mm/yr，对城市基础设施和人员安全造成潜在危害。为了实现对东营市的地表形变监测，该文采用Sentinel-1B数据进行监测。本文利用84景Sentinel-1B数据，运用短基线集(Small Baseline Subsets InSAR, SBAS-InSAR)技术获取了东营市2016年9月至2019年9月的地表形变特征，并结合相关资料分析了主要沉降漏斗的沉降原因。实验结果表明，东营市在近海沿岸地区有两个显著的沉降中心，平均沉降速率分别为9.3 cm/yr和10.5 cm/yr，且最大沉降量均超过了50 cm，联合多源要素分析得知地下卤水的抽取是导致该地区沉降的主要原因。

Abstract: Dongying City is located in the Yellow River Delta in the north of Shandong Province. The natural compaction of surface sediments, the development of underground resources and urban construc-tion activities will lead to the surface subsidence in this area, and the deformation rate in serious areas can reach −100 mm/yr, causing potential hazards to the safety of urban infrastructure and personnel. In order to monitor the surface deformation of Dongying City, this paper uses Senti-nel-1B data to monitor the surface deformation. In this paper, the surface deformation character-istics of Dongying City from September 2016 to September 2019 were obtained by using the 84- view Sentinel-1B data and the Small Baseline Subsets (SBAS) technique, and the subsidence causes of the main subsidence funnel were analyzed in combination with the relevant data. The experi-mental results show that there are two significant settlement centers in the coastal area of Dongying City, with average settlement rates of 9.3 cm/yr and 10.5 cm/yr respectively, and the maximum settlement amount both exceeds 50 cm. Combined with multi-source factor analysis, it is concluded that the extraction of underground brine is the main reason for the settlement in this area.