基于Sentinel-1数据的三峡库区木鱼包滑坡时空变形演化特性分析

Monitoring and Analyzing the Spatio-Temporal Deformation Characteristics of Muyubao Landslide in Three Gorges Reservoir Using Sentinel-1

三峡库区脆弱的地质环境、降雨及库水位升降作用,致使长江干(支)流滑坡分布广、数量多、危害大,滑坡监测是地质灾害减灾防灾的主要措施之一.以三峡库区木鱼包滑坡为研究对象,以哨兵1号(Sentinel-1)数据为数据源,获取了木鱼包滑坡及其附近区域2017年4月至2021年3月的120景数据,使用时间序列InSAR分析方法,研究木鱼包滑坡时空形变演化特性,并与地基GNSS监测数据和地质调查结果进行比对.结果表明:SBAS-InSAR与GNSS监测数据具有一定的差异性,但在演化趋势上具有较好的一致性;通过InSAR分析结果与现场调查比对分析,SBAS-InSAR对滑坡边界及滑坡发展演化过程中较大变形具有较强的监测能力.

The fragile geological environment of the Three Gorges reservoir area,the effect of rainfall and reservoir water level lead to the wide distribution,large number and great harm of the Yangtze River main(branch)landslide.Landslide monitoring is one of the main measures for geological disaster reduction and prevention.Taking Muyubao landslide in the Three Gorges Reservoir area as the research object and using Sentinel-1 data as the data source,120 scene data in vicinity of Muyubao landslide from April 2017 to March 2021 were obtained.The spatio-temporal deformation evolution characteristics of Muyubao landslide were studied by using time-series InSAR analysis method.It was compared with the ground-based GNSS monitoring data and geological survey results.The results show that there are some differences between InSAR and GNSS monitoring data,but there is a good consistency in the evolution trend.Through the comparison between InSAR analysis results and field investigation,InSAR has a strong ability to monitor landslide boundary and large deformation in the process of landslide development and evolution.