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Glacier Retreat in Eastern Himalaya Drives Catastrophic Glacier Hazard Chain
Geophysical Research Letters ( IF 5.2 ) Pub Date : 2024-04-10 , DOI: 10.1029/2024gl108202 Yao Li 1 , Yifei Cui 1, 2 , Xie Hu 3 , Zhong Lu 4 , Jian Guo 1 , Yu Wang 5 , Hao Wang 5 , Shuofan Wang 1 , Xinzhi Zhou 1
Geophysical Research Letters ( IF 5.2 ) Pub Date : 2024-04-10 , DOI: 10.1029/2024gl108202 Yao Li 1 , Yifei Cui 1, 2 , Xie Hu 3 , Zhong Lu 4 , Jian Guo 1 , Yu Wang 5 , Hao Wang 5 , Shuofan Wang 1 , Xinzhi Zhou 1
Affiliation
Cryospheric 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.
更新日期：2024-04-10
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