基于DS-InSAR技术的金沙江流域贡觉地区滑坡与地裂缝形变特征  

Characteristics of Deformation of Landslide and Ground Fissure in Gongjue Area of Jinsha River Basin,China Based on DS-InSAR Technology

作　　者：盛磊 张露 杜玉玲[1,2] 邓文杰 闫世勇 SHENG Lei;ZHANG Lu;DU Yu-ling;DENG Wen-jie;YAN Shi-yong(Key Laboratory of Land Environment and Disaster Monitoring of Ministry of Nature Resources,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;School of Environment and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]中国矿业大学自然资源部国土环境与灾害监测重点实验室,江苏徐州221116 [2]中国矿业大学环境与测绘学院,江苏徐州221116 [3]中国科学院空天信息创新研究院,北京100094

出　　处：《地球科学与环境学报》2022年第5期814-825,共12页Journal of Earth Sciences and Environment

基　　金：国家自然科学基金项目(41876226)。

摘　　要：金沙江流域贡觉地区地处中国西部山区,地形复杂,构造发育,滑坡和地裂缝等地质灾害隐患分布广泛,对沿线人民生命财产与交通等基础设施建设和安全运营构成严重威胁,亟需对该地区滑坡和地裂缝近期发育特征开展广域监测分析。采用2019年2月至2021年7月64景升轨和69景降轨Sentinel-1数据,采取融合分布式目标的DS-InSAR技术,获取研究区雷达视线向高精度地表形变空间分布信息,共探测到22处明显地质灾害隐患,其中沙东乡附近滑坡雷达视线向最大形变速率可达-254 mm·年^(-1)。在此基础上,结合最大坡度向形变和降雨数据,分析了该地区典型滑坡和地裂缝形变时空变化特征。结果表明:该地区滑坡分布规模及其运动形态多样,与地形关系较为密切,地裂缝形变与其走向呈现较好的空间相关性,且降雨加剧了部分地质灾害的活动性。The Gongjue area in Jinsha River Basin is located in the mountainous region,SW China,with the development of geological hazards such as landslides and ground fissures,which bring the serious threat to the lives and properties of people along the route,and the construction and safe operation of infrastructure such as transportation.Thus,there is an urgent need to conduct a wide-area monitoring and analysis of the recent development characteristics of landslides and ground fissures in the area.The DS-InSAR technology with both high-coherence points and distributed targets is employed to obtain the high-precision spatial distribution information of surface in the LOS direction with 64 scenes in ascending orbit and 69 scenes in descending orbit of Sentinel-1 image,which are acquired from February 2019 to July 2021.22 obvious geological hazards are detected,and the maximum deformation rate of-254 mm·a^(-1) along the LOS direction is observed on the landslide near Shadong town.And then,the spatial and temporal characteristics of typical landslides and ground fissure deformation in the area were also analyzed based on the deformation along its steepest slope direction and precipitation data.The results indicate that landslide deformation is seriously affected by complex topography,and ground fissure deformation yields a good spatial correlation with its strike direction,and precipitation aggravates the activity of some geological hazards.

关 键 词：滑坡 地裂缝 地质灾害 DS-InSAR技术 分布式散射体 通用型大气改正服务 金沙江流域 

分 类 号：P237[天文地球—摄影测量与遥感]