Analyzing the Characteristics of Glacial Debris Flow Activity in Parlung Tsangpo Basin, Tibet

地质学 冰期 泥石流 碎片 冰川 地貌学 冰碛 山崩 构造盆地 自然地理学 冰川湖 流域 冲积扇
作者
Jiao Wang,Qiang Zou,Wen Jin,Yanju Fu
出处
期刊:ICL Contribution to Landslide Disaster Risk Reduction 卷期号:: 339-346
标识
DOI:10.1007/978-3-030-60713-5_32
摘要

Parlung Tsangpo, which has a complex geological structure, active neotectonic movement, special hydrometeorological conditions and frequent glacier activity, has become the most dangerous segment of the Sichuan-Tibet highway due to the destruction caused by large-scale glacier debris flows. Evaluating the activity of glacier debris flow gullies is important for forecasting, assessing, and mitigating debris flows. The longitudinal profile of a debris flow valley is a fundamental morphological condition, and together with the rainfall and related hydraulic conditions, all three factors contribute to the initiation and transportation of glacial debris flows. To resolve the problems, such as the complexity of determination research and difficulty of data collection in the evaluation of debris flow gullies, the distribution characteristics of glacial debris flows are analyzed based on the statistical data in the study area. Meanwhile, an effective and convenient method for quantitatively analyzing the evolution stage and activity degree of glacier debris flow gullies is discussed. In this method, an index expressing the shape of the valley’s longitudinal profile is used to link the excess entropy of the geomorphic system with the evolution stage for debris flow gullies. Then, the new evaluation standard for gully evolution can provide a quick activity assessment for debris flow-related early warning systems in the marine glacial area.
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