用Sentinel-1卫星影像数据监测珠江西岸地表沉降

Monitoring Surface Subsidence on the West Bankof the Pearl River with Sentinel-1

珠江西岸近年来频繁发生地面沉降、塌陷等地质灾害,对人民生命安全和经济发展造成了严重影响。为准确把该区域的地面沉降规律,利用合成孔径雷达干涉测量(Interferometric Synthetic Aperture Radar, InSAR)技术开展了沉降监测,通过约220景Sentinel-1A/B卫星影像数据,获取了珠江西岸2015—2022年的地表形变信息。结果表明珠江西岸整体变形较小,但珠海市金湾区、江门市江海区和新会区、中山市马安岛等局部区域沉降变形显著,最大沉降形变量超过350 mm。文中利用2012—2022年间的高分辨率历史存档光学影像数据,揭示了珠海市横琴新区局部区域的土地资源利用变化情况。最后分析软土层分布和人类活动综合作用是造成珠江西岸地表沉降的主要原因。

Geological disasters such as ground subsidence and collapse have occurred frequently on the west coast of the Pearl River in recent years,causing serious impacts on people's life safety and economic development.In order to accurately put the ground subsidence pattern in this region,the subsidence monitoring was carried out by Interferometrric Synthetic Aperture Radar(InSAR)technology,and the surface deformation information of the west bank of Pearl River from 2015-2022 was obtained by about 220 of Sentinel-1A/B satellite image.The results show that the overall deformation of the west bank of the Pearl River is small,but the local areas such as Jinwan District of Zhuhai City,Jianghai District and Xinhui District of Jiangmen City,and Ma'an Island of Zhongshan City have significant settlement deformation,with the maximum settlement deformation exceeding 350mm.In the paper,high-resolution historical archived optical image during 2012-2022 are used to reveal the land resource use changes in the local area of Hengqin New Area,Zhuhai.Finally,the distribution of soft soil layers and the combined effect of human activities are analyzed as the main causes of surface subsidence on the west bank of the Pearl River.