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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Tiantian Zhang & Yueping Yin & Bin Li & Yang Gao & Meng Wang, 2022. "Characteristics and dynamic analysis of the October 2018 long-runout disaster chains in the Yarlung Zangbo River downstream, Tibet, China," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 113(3), pages 1563-1582, September.
    • Handle: RePEc:spr:nathaz:v:113:y:2022:i:3:d:10.1007_s11069-022-05358-z
    DOI: 10.1007/s11069-022-05358-z
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    References listed on IDEAS

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    1. Huicong Jia & Fang Chen & Donghua Pan, 2019. "Disaster Chain Analysis of Avalanche and Landslide and the River Blocking Dam of the Yarlung Zangbo River in Milin County of Tibet on 17 and 29 October 2018," IJERPH, MDPI, vol. 16(23), pages 1-12, November.
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