基于PS-InSAR的天津地区沉降监测及分析

城市地面沉降监测是保障城市安全建设和健康发展的重要手段之一，而传统的沉降监测方法无法大尺度反映地面形变信息。针对近几年天津地区出现大面积沉降现象，利用Sentinel-1A数据基于永久散射体干涉测量技术开展城区大范围沉降监测研究并分析了地面沉降原因。结果表明：近年来天津地区多处出现地面沉降，严重沉降区集中天津的武清区、北辰区以及郊区乡镇结合区域的王庆坨镇、胜芳镇、左各庄镇、静海镇以及大寺镇,其最大沉降漏斗位于王庆坨镇，沉降速率为-63.2 mm/a。经分析发现天津地面沉降与地下水过度开采、大型工业区的迁移和建设以及活动断裂带地质活动有关。

Settlement Monitoring and Analysis of Tianjin Area based on PS-InSAR

Urban ground subsidence monitoring is one of the important means to ensure the safe construction and healthy development of the city, and the traditional settlement monitoring method can not reflect the ground deformation information on a large scale. In view of the large-scale subsidence phenomenon in Tianjin in recent years, Sentinel-1A data is used to carry out large-scale settlement monitoring research in urban areas based on the interferometry technology of permanent scattering body and analyze the causes of ground subsidence. The results show that many places in Tianjin have ground subsidence, and the severe settlement area concentrates the Wuqing District, Beichen District and the suburban township combined area of Wang Qingxuan Town, Shengfang Town, zuogezhuang town, Jinghai Town and Daji Town, the largest settlement funnel is located in Wang Qingxuan Town, the settlement rate is -63.2mm/a. The analysis shows that the ground subsidence in Tianjin is related to overexploitation of groundwater, migration and construction of large industrial areas and geological activities of active fault zones.