Study On The Evolution Of Suoertou Landslide Based On Multitemporal Data

Medium and large scale landslide has always been the key research object in the field of landslide disaster.The traditional field investigation and research is expensive and inefficient,which is not conducive to the completion of rapid investigation after the disaster.In recent years,landslide evolution analysis based on remote sensing image has gradually become the first choice for many researchers to carry out rapid landslide investigation.Therefore,this paper takes the Lockerhead landslide in Zhouqu area as the main research object,uses the multi-year high score remote sensing image and combines the UAV aerial image,carries on the thorough exploration to the lockerhead landslide dynamic evolution characteristic.The main results are as follows:(1)Using pixel-oriented and object-oriented methods,the remote sensing image data in the experimental area are classified and the information of the target object is extracted.Both methods can extract the landslide area partially,but the accuracy and integrity of the extraction are different.(2)The results of multi-stage image data showed that there was no sliding scale in the landslide area.The degree of change in most areas is relatively slight,and in the upper part of the landslide area,the degree of change is more obvious than that in the surrounding area.(3)Suoertou landslide is mainly divided into the deformation area of the back of the landslide,the deformation area of the middle part of the landslide and the deformation area of the front edge of the landslide.the normalized vegetation index and vegetation coverage data for the six-year image data in 2010,2014,2015,2016,2018 and 2019 were calculated.The results show that the vegetation index varies with the season.In the same season,the landslide is in the trend of slow creep,and the sliding trend in the three parts of the landslide is not the same.(4)The detailed characteristics of landslide area are analyzed by aerial image of UAV.The 6 key areas in the landslide area are compared with the high-definition orthophoto map,elevation map and slope map.The results show that the slope direction of the three different areas of the Suoertou landslide is different,and the slope body contains a large amount of gravel soil,which has the characteristics of obvious fracture and fracture zone landslide.