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Remote Sensing for Natural Resources    2022, Vol. 34 Issue (1) : 265-276     DOI: 10.6046/zrzyyg.2021076
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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
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Abstract  

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.
Keywords optical remote sensing      potential hazards of ice avalanches      disaster chain      southeast Tibet     
ZTFLH:  TP79  
Corresponding Authors: WANG Meng     E-mail: liuwen2009.hi@163.com;wangmengscrs@qq.com
Issue Date: 14 March 2022
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Wen LIU
Meng WANG
Ban SONG
Tianbin YU
Xichao HUANG
Yu JIANG
Yujiang SUN
Cite this article:   
Wen LIU,Meng WANG,Ban SONG, et al. Surveys and chain structure study of potential hazards of ice avalanches based on optical remote sensing technology: A case study of southeast Tibet[J]. Remote Sensing for Natural Resources, 2022, 34(1): 265-276.
URL:  
https://www.gtzyyg.com/EN/10.6046/zrzyyg.2021076     OR     https://www.gtzyyg.com/EN/Y2022/V34/I1/265
数据
范围		 数据源 分辨
率/m		 时相 用途



研究
区		 Landsat8 15 2017年11月20日—2020年11月20日 用于研究区冰崩隐患区域性光学遥感解译
GF-1 2 2014年1月2日—2020年11月15日
尖母
普曲		 WorldView-2 0.5 2006年4月30日 用于尖母普曲典型点光学遥感解译
GF-1 2 2015年7月25日
GF-1B 2 2019年11月7日
则隆
弄沟		 WorldView-2 0.5 2017年12月4日 用于则隆弄沟典型点光学遥感解译
GF-2 0.8 2019年6月2日
无人机航摄 0.2 2020年10月20日
米堆
沟		 WorldView-2 0.5 2001年11月14日 用于米堆沟典型点光学遥感解译
WorldView-2 0.5 2013年2月12日
WorldView-2 0.5 2014年11月8日
WorldView-2 0.5 2015年2月7日
WorldView-2 0.5 2017年12月12日
无人机航摄 0.2 2020年10月31日
Tab.1  List of optical remote sensing data
Fig.1  Distribution of ice avalanche disaster in study area
类型 直接解译标志 间接解译标志
颜色 形态 冰裂隙发育情况 (潜在)冰崩体位置
冰崩隐患点 白色、灰色 舌形、长条形、梨形、不规则形等 以横裂隙为主,侧裂隙和纵裂隙次之 多位于冰川末端 潜在冰崩区前缘往往呈陡坎状或发育跌水坎,与斜坡前缘高差大
已发生的冰崩灾害 冰崩前呈白色、灰色,冰崩后呈浅灰色、暗棕色 冰崩前呈舌形、长条形、不规则形 冰崩前可见冰裂隙 多位于冰川末端 地势较陡,堆积区与周围地质体在色调、地貌上有明显差异
冰崩前呈白色、灰色,冰崩后呈暗褐色 冰崩前呈舌形、长条形、不规则形 冰崩前可见冰裂隙 多位于冰川末端 地势较陡,冰崩灾害发生后有明显铲刮区,堆积物堵塞沟道,局部形成堰塞湖
冰崩前呈白色、灰色,冰崩后呈暗棕色 冰崩前呈舌形、近三角形、不规则形 冰崩前可见冰裂隙 多位于冰川末端 地势较陡,冰崩导致冰湖溃决,溃口与周围岩体在色调、纹理上有明显差异
Tab.2  List of signs for optical remote sensing interpretation of ice avalanche
Fig.2  Remote sensing interpretation map of Miduigou
Fig.3  Comparison of multiphase remote sensing images of ice crevasse and glacial lake in Midui Glacier
Fig.4  Remote sensing interpretation map of Jianmupuqu
Fig.5  Comparison of multiphase remote sensing images of debris flow fans, potential ice avalanches and channel sources in Jianmupuqu
Fig.6  Remote sensing interpretation map of Zelongnonggou
Fig.7  Comparison of multiphase remote sensing images of debris flow fans and channel sources in Zelongnonggou
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