金沙江结合带高位远程滑坡灾害链式特征遥感动态分析

金沙江结合带由于地质构造发育，地震活动频繁，河谷切割强烈，岸坡高陡狭窄, 岩体极为破碎，历史上发生过多起大型滑坡堵江事件。以白格滑坡两次堵江事件（2018年10月11日、2018年11月3日）为例，采用2009年12月4日至2020年10月16日多期、多源卫星遥感数据源，通过遥感判识、对比分析等方法对滑坡体滑前斜坡变形特征、滑后滑坡堆积特征、滑后斜坡残留体变形特征进行特大型堵江滑坡链式特征遥感动态分析。根据多期遥感影像，将白格滑坡变形特征划分为早期滑动变形阶段（2009—2011年）、稳定变形阶段（2011—2015年）、快速变形阶段（2015—2017年）、剧烈变形阶段（2017—2018年）、变形破坏阶段（2018年以后）等5个阶段。根据滑坡第一次滑后的变形破坏特征，将滑坡划分为滑源区、铲刮区、堆积区以及拉裂变形区。根据滑坡第二次滑后的变形破坏特征，将滑坡划分为二次滑坡滑源区、二次滑坡堆积区（堰塞体）、二次铲刮（堆积）区、二次铲刮区影响区以及拉裂变形区。基于上述研究成果，对白格滑坡灾害链式特征进行总结分析，为金沙江结合带高位远程滑坡灾害链式特征研究提供参考。

Remote sensing dynamic analysis of chain characteristics of long range and high position landslide in Jinsha River junction zone: A case study of Baige landslide

Due to the development of geological structure, frequent seismic activity, strong valley cutting, high steep and narrow bank slope, extremely broken rock mass, there have been many large-scale landslides blocking the Jinshajiang River in history.Taking the two river blocking events of Baige landslide (October 11, 2018 and November 3, 2018) as an example, this paper uses the multi-phase and Multi-source Satellite remote sensing data sources from December 4, 2009 to October 16, 2020 to analyze the deformation characteristics of the slope before sliding, the accumulation characteristics of the slope after sliding and the residual deformation characteristics of the slope after sliding by means of remote sensing identification and comparative analysis The analysis of telemotional states. According to the multi-stage remote sensing images, the deformation characteristics of Baige landslide are divided into five areas: early sliding deformation stage (2009-2011), stable deformation stage (2011-2015), rapid deformation stage (2015-2017), severe deformation stage (2017-2018) and deformation failure stage (after 2018). According to the deformation and failure characteristics of the landslide, the landslide is divided into sliding source area, scraping area, accumulation area and tensile fracture deformation area. According to the deformation and failure characteristics of the landslide after the second sliding, the landslide is divided into the secondary landslide source area, the secondary landslide accumulation area (weir body), the secondary scraping (accumulation) area, the secondary scraping affected area and the tensile fracture deformation area. Based on the above research results, this paper summarizes and analyzes the chain characteristics of Baige landslide disaster, which provides a reference for the research on the chain characteristics of long range and high position landslide disasters in Jinsha River junction zone.