Morphological Deformation Characteristics of Landslide Based on UAV Imagery:Taking Xieliupo Landslide in Bailong River Basin of Longnan as an Example
From August to September 2020,the Xieliupo landslide in the Bailong River basin in Longnan continued to deform,seri-ously threatening the life and property safety of residents at the foot of the slope.Xieliupo landslide was taken as the research object.Based on the high-resolution UAV(unmanned aerial vehicle)imagery,the orthophoto images and digital surface models before and af-ter the sliding of the Xieliupo landslide were extracted,of which the correlation was analyzed by COSI-Corr software.The offset infor-mation of the characteristic points on the landslide surface was calculated,and the vertical variation was obtained through the DSM(digital surface model)difference method.Finally,the movement and material change of the Xieliupo landslide were understood and analyzed,and the formation and evolution process and failure mechanism of the colluvial landslide in the middle and high mountains and valleys were discussed.The research results show that the deformation area of Xieliupo landslide is mainly the left middle and lower part of the slip source area and the right secondary landslide.The maximum vertical sliding displacement is 5.89 m,the average hori-zontal displacement is 6.24 m,and nearly 42％of the slip source area has been deformed.From June to September 2020,the sliding volume of torrential slope landslide is 33 871 m3,the accumulation volume is 10 215 m3,the rainfall erosion volume is 23 656 m3,and the failure mode is a creeping-tension type thrust load-caused landslide.UAV high-precision data can not only clearly and intui-tively identify the signs of landslide deformation and damage,but also calculate the surface vertical displacement,horizontal displace-ment,volume change and the profile before and after sliding,which provides an important basis for rescue and disaster relief,scientific decision-making,and has broad application prospects.
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