Spatial-Temporal Evolution of Geohazard Chain Participated by Glacier and Snow in Zhibai Gully,SE Tibetan Plateau
The glacier and snow-related geohazard chain pose a significant threat to the economic activities in the Southeast Tibetan Plateau.Analyzing the evolution law of disaster can provide support for the risk prevention and mitigation,and also for the early identification of disaster.Based on field survey,remote sensing interpretation,and hazard monitoring,in this paper it aims to analyze the evolution of disaster formation conditions and the activity characteristics of six geohazard chain events since the 1950.The results show that the geohazard chain in Zhibai Gully was driven by glacier activity and rock collapse.The evolution models of geohazard chain are summarized into two types:physical property change chain induced by ice water phase transformation,and geological cascade chain induced by coupling of multi factors.It is found that the disaster activity is significantly controlled by the earthquake,and the disaster characteristics is correlated with the temporal-spatial evolution of the formation conditions.Under the influence of the earthquake and deglacialtion,the initiation of disaster chain is transformed from glacier active to rock collapse.The increasing of soil material sources and the effect of ice water phase transformation both enhance the evolution length and scale of disaster.For the present,the Zelongnong glacier is retreating seriously,decreasing the possibility of a geohazard triggered by a glacier.Corresponding the ice/rock avalanche becomes the key to the geohazard chain.
万方数据
维普
