基于MT-InSAR技术的广东省地表变形监测与分析

Monitoring and Analysis of Surface Deformation in Guangdong Province Based on MT-InSAR Technology

文章采用2018—2020年的805景哨兵1号卫星雷达影像,利用融合永久散射体和同分布散射体的多时相InSAR分析技术(MT-InSAR),获取了广东省地表约1.35亿个监测点的变形速率和变形序列。分析表明,广东省地表整体稳定,沉降速率基本在2 mm/年以下;变形区主要分布于珠江三角洲平原、练江平原软土区及人类工程活动较为密集的区域;珠江市金湾区和斗门区沉降严重区域速率可达-60~-30 mm/年;汕头市司马浦镇及练江区域监测点沉降速率可达-30~-20 mm/年;普宁市地表在2019年1月后出现抬升,累计变形量为79.3 mm;深圳市某高层建筑物基坑周边累计变形量达-75.4 mm。影响地面变形的主要因素包括软土地质环境,以及地下水抽取、建筑物荷载、基坑开挖等人类工程活动,文章研究成果可为地面沉降调查和灾害防治工作提供科学依据。

Based on 805-view Sentinel 1 satellite radar images from 2018 to 2020, the deformation rate and deformation sequence of about 135 million monitoring points on the surface of Guangdong Province were obtained by using multi-temporal InSAR analysis technology( MT-InSAR) combined with permanent scatterers and identically distributed scatterers. The analysis shows that the surface of Guangdong Province is stable, and the settlement rate is basically below 2 mm/year. The deformation area is mainly distributed in the soft soil area of the Pearl River Delta Plain, the Lianjiang Plain and the areas with dense human engineering activities. The rate of serious settlement area in Jinwan District and Doumen District of Zhujiang City can reach-60 ~-30 mm/year. The settlement rate of monitoring points in Simapu Town and Lianjiang District of Shantou City can reach-30 ~-20 mm/year. The surface of Puning City rose after January 2019, and the cumulative deformation was 79.3 mm. The cumulative deformation around the foundation pit of a high-rise building in Shenzhen reaches-75.4 mm. The main factors affecting ground deformation include soft soil geological environment, as well as human engineering activities such as groundwater extraction, building load, foundation pit excavation. The research results in this paper can provide scientific basis for land settlement investigation and disaster prevention.