Deformation Evolution Characteristics Of The Woda Village Landslide In The Jinsha River Basin Using InSAR Technique

Interferometry synthetic aperture radar(InSAR),which is a new space-to-earth observation technology developed in recent years,has the advantages of all day and night,all weather,larger area,high-precision,high-efficiency and high-resolution,etc.InSAR has been widely used in the field of landslide geological disaster monitoring.In particular,InSAR has obvious advantages in early identification of the location and scope of landslide creep,evaluation of regional landslide activity intensity,and identification of landslide temporal and spatial deformation modes.Taking the Voda Village landslide in the Jinsha River Basin as the research object,carry out the application research of InSAR.The comparative analysis of landslide monitoring results is an important reference for regional disaster prevention and mitigation work.First,use InSAR processing to extract the average deformation rate of the Voda Village landslide and calculate the time series of landslide deformation.Then extract the deformation rate and characteristics of the Voda Village landslide along the slope direction and analyze the deformation mechanism of the landslide.The results show that the LOS-direction deformation of the landslide and the strong deformation area shown by the slope-direction deformation of the landslide are roughly the same.However,the deformation rate value of the slope direction of the landslide is greater than the deformation rate value of the LOS direction.The results also show that the landslide slides down along the Jinsha River as a whole,which conforms to the law of natural movement of the landslide body,and the large part of the landslide deformation is the middle and front part.Then,extract the historical cumulative displacement deformation curve of the landslide line of sight with a larger point A,and find that the landslide deformation approximately changes linearly — from a uniform deformation to a deformation with a reduced deformation rate.Finally,through the interpretation of the remote sensing image of the landslide area,it is found that the interpretation result of the remote sensing image of the landslide area is basically consistent with the InSAR results and the on-site geological data.In summary,InSAR is applicable to early warning and monitoring of geological hazards in complex mountainous areas,which provides references for subsequent monitoring and early warning of similar landslides.