摘要
Abstract
The Jiaju landslide is located in the Jiaju Xizang Village scenic spot in Danba County,Ganzi Prefecture,Sichuan Province.It has been in an unstable state for a long time due to multiple factors,including geological structures,erosion by the Dajin River,and precipitation,posing a potential threat to local residents and infrastructure safety.To reveal its deforma-tion mechanism and evolutionary characteristics,this study uses Sentinel-1A ascending radar image data from January 2021 to June 2022 and employs the small-baseline subset interferometric synthetic aperture radar(SBAS-InSAR)technique for monitoring and analysis.The results show that the deformation of the Jiaju landslide exhibits significant spatial heterogene-ity.The maximum deformation rate along the radar line-of-sight(LOS)reaches-0.22 m/a,with a cumulative deformation of-0.312 m.The area can be divided into three secondary sliding zones.The rear edge exhibits slow retrogressive deforma-tion driven by gravity,while the front edge shows traction-type sliding under the erosion of the Dajin River and hydrody-namic forces.The deformation process underwent four stages:initial accumulation,local acceleration,overall expansion,and intermittent intensification.Notably,from September to October 2021 and February to March 2022,increased pore water pressure caused by rainfall and snowmelt significantly accelerated landslide deformation.Analysis of monitoring points reveals that landslide deformation is highly correlated with rainfall,with deformation rates significantly increasing during peak rainfall periods,exhibiting a certain lag effect.The study reveals the synergistic driving mechanism of the Jiaju land-slide under the influences of geological structure,precipitation,and hydrodynamic forces,providing a scientific basis for regional landslide disaster monitoring,early warning,and prevention.关键词
甲居滑坡/小基线子集(SBAS-InSAR)/形变监测/演化特征Key words
Jiaju landslide/small-baseline subset interferometric synthetic aperture radar(SBAS-InSAR)/deformation monitoring/evolutionary characteristics分类
天文与地球科学
