Characteristics and dynamic analysis of the October 2018 long-runout disaster chains in the Yarlung Zangbo River downstream, Tibet, China

Tiantian Zhang, Yueping Yin (), Bin Li, Yang Gao and Meng Wang
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Tiantian Zhang: Institute of Geomechanics, Chinese Academy of Geological Sciences, Key Laboratory of Active Tectonics and Geological Safety, Ministry of Natural Resources
Yueping Yin: China Institute of Geological Environment Monitoring
Bin Li: Institute of Geomechanics, Chinese Academy of Geological Sciences, Key Laboratory of Active Tectonics and Geological Safety, Ministry of Natural Resources
Yang Gao: Institute of Geomechanics, Chinese Academy of Geological Sciences, Key Laboratory of Active Tectonics and Geological Safety, Ministry of Natural Resources
Meng Wang: Sichuan Geological Survey Institute

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2022, vol. 113, issue 3, No 7, 1563-1582

Abstract: Abstract On October 17 and 29, 2018, two rock and ice avalanches occurred on the western slope of the Sedongpu Basin upstream of the Yarlung Zangbo River in the Tibetan Plateau. Both avalanches formed the disaster chains and damaged many bridges and roads. Both avalanches on high mountain slope at an elevation of 6000 m asl above sea level triggered long-runout disaster chains, including debris flow, river blocking and flood. In this study, the disaster characteristics and dynamic process were analyzed by multitemporal satellite imagery. The results show that both of the initial sliding bodies were composed of rock and ice. Due to the large elevation difference, the initial sliding bodies rapidly descended into valley floor and immediately transformed into a debris flow after impact and fragmentation. And then, this study divided the disaster chain into four zones by satellite images and field observation, including source zone, dynamic erosion zone, deposition and damming zone, and flash flood zone. This study also carried out the numerical simulation of the disaster by RAMMS. The numerical results reproduced the dynamical process of the debris flow. Furthermore, the potential causes of disaster, evolution process, and the geohazard tendency are discussed.

Keywords: Tibetan Plateau; Rock and ice avalanches; Disaster chains; Debris flow; Dynamic process (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s11069-022-05358-z

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