Surveys and chain structure study of potential hazards of ice avalanches based on optical remote sensing technology: A case study of southeast Tibet
LIU Wen(), WANG Meng(), SONG Ban, YU Tianbin, HUANG Xichao, JIANG Yu, SUN Yujiang
Sichuan Institute of Geological Survey (Key Laboratory of Evaluation and Utilization of Strategic Rare Metalsand Rare Earth Resource), Chengdu 610081, China
Glaciers are widely distributed in southeast Tibet. Glacier instability is prominent in this region against the backdrop of global warming. Surveys of the potential hazards of ice avalanches using optical remote sensing are practically significant for disaster prevention and mitigation in the region. According to the hue, morphology, texture, and shadow characteristics of the potential hazards of ice avalanches on remote sensing images, this study established the symbols of remote sensing interpretation of potential hazards of ice avalanches in the study area. Based on this, a total of 232 potential hazards of ice avalanches were interpreted in southeast Tibet, including 47 large, 147 super large, and 38 giant ones. Then, this study analyzed the essential characteristics and spatial distribution of the potential hazards based on the characteristics of terrain, landform, and regional geological environment. Consequently, four concentrated distribution areas and two concentrated distribution zones were determined. The potential hazards of ice avalanches in the study area show distinct chain characteristics. According to the spatio-temporal relationships between the potential hazards and their possible secondary disasters, the ice avalanche disaster chains in southeast Tibet can be divided into three types, namely, ice avalanche - glacial lake outburst flood - debris flow disaster chains, ice avalanche - debris flow - barrier lake - flood disaster chains, and ice avalanche - debris flow disaster chains. Taking the potential hazard chains of ice avalanches in Miduigou, Jianmupuqu, and Zelongnonggou as examples, this study analyzed the dynamic change characteristics and chain structure of these potential hazard chains using optical remote sensing technology. The purpose is to provide basic data for an in-depth study on potential hazards of ice avalanches in southeast Tibet.
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LIU Wen, WANG Meng, SONG Ban, YU Tianbin, HUANG Xichao, JIANG Yu, SUN Yujiang. Surveys and chain structure study of potential hazards of ice avalanches based on optical remote sensing technology: A case study of southeast Tibet. Remote Sensing for Natural Resources, 2022, 34(1): 265-276.
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2022, Vol. 34 
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