Affiliation:
1. State Key Laboratory of Hydroscience and Engineering Department of Hydraulic Engineering, Tsinghua University Beijing China
2. Key Laboratory of Hydrosphere Sciences of the Ministry of Water Resources Tsinghua University Beijing China
3. College of Urban and Environmental Sciences Peking University Beijing China
4. Roy M. Huffington Department of Earth Sciences Southern Methodist University Dallas TX USA
5. Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu China
Abstract
AbstractCryospheric responses to climate warming include glacier retreat, altitude‐dependent thermal instability, and abundant meltwater, which increase the frequency of catastrophic glacier hazard chain (CGHC) events. Here we investigated the formation mechanism of a special CGHC event in 2018, in the Sedongpu Glacier, Eastern Himalayas, China. Based on the multi‐source remote sensing, seismic signal analysis, and numerical simulation, we conducted long‐term retrospective analysis and co‐event process reconstruction. The results show that the event could be divided into two phases. First, the hanging glacier with a volume of 8.5 × 106 m3 collapsed onto the downstream trunk glacier. Next, ∼1.17 × 108 m3 eroded materials from the impacted glacier transformed into debris flow and traveled downstream 8 km. During the cascading process, ice‐rock avalanche momentum and glacier velocity are key factors in determining CGHC formation and eventual volume. Our study helps better understand the domino effects of the CGHC disaster.
Publisher
American Geophysical Union (AGU)
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