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New insights into the delayed initiation of a debris flow in southwest China

Author

Listed:
  • Taixin Peng

    (Chinese Academy of Sciences (CAS)
    University of Chinese Academy of Sciences (UCAS))

  • Ningsheng Chen

    (Chinese Academy of Sciences (CAS)
    Academy of Plateau Science and Sustainability)

  • Guisheng Hu

    (Chinese Academy of Sciences (CAS)
    Academy of Plateau Science and Sustainability)

  • Shufeng Tian

    (Chinese Academy of Sciences (CAS)
    University of Chinese Academy of Sciences (UCAS))

  • Zheng Han

    (Central South University)

  • Enlong Liu

    (Sichuan University)

Abstract

On 6 July 2020, 3 h 40 min after rainfall stopped, a delayed debris-flow disaster occurred due to colluvium deposits in a hollow region (CDH) in the Chenghuangmiao Gully, Sichuan Province, China, resulting in 4 deaths and 27 injuries. This study explores the initiation process of the delayed debris flow and the cause for the delay. Field investigations, catchment geometry interpretation, laboratory tests, theoretical calculations, and fluid–solid coupling numerical simulation were performed to obtain landslide parameters and understand the mechanisms of the event. Results show that (1) the event was a giant low-frequency viscous debris flow. (2) It was initiated by the delayed landslide process under the influence of back-end confluence. (3) The debris-flow discharge in the main gully increased over 19.5 min. (4) The seepage process inside the CDH continued for 3 h 20 min after the rainfall stopped before the pore pressure and reduction in strength were sufficient to initiate the debris flow. This research provides new insights on delayed debris-flow disasters and can be a reference for improving disaster management systems, especially monitoring and early warning systems, thereby avoiding future casualties.

Suggested Citation

  • Taixin Peng & Ningsheng Chen & Guisheng Hu & Shufeng Tian & Zheng Han & Enlong Liu, 2021. "New insights into the delayed initiation of a debris flow in southwest 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. 108(3), pages 2855-2877, September.
    • Handle: RePEc:spr:nathaz:v:108:y:2021:i:3:d:10.1007_s11069-021-04803-9
    DOI: 10.1007/s11069-021-04803-9
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    References listed on IDEAS

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    1. Zhanyu Zhang & Liting Sheng & Jie Yang & Xiao-An Chen & Lili Kong & Bakhtawar Wagan, 2015. "Effects of Land Use and Slope Gradient on Soil Erosion in a Red Soil Hilly Watershed of Southern China," Sustainability, MDPI, vol. 7(10), pages 1-17, October.
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    Cited by:

    1. Yao Shunyu & Nazir Ahmed Bazai & Tang Jinbo & Jiang Hu & Yi Shujian & Zou Qiang & Tashfain Ahmed & Guo Jian, 2022. "Dynamic process of a typical slope debris flow: a case study of the wujia gully, Zengda, Sichuan Province, 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. 112(1), pages 565-586, May.

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