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Case study of a giant debris flow in the Wenjia Gully, Sichuan Province, China

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  • Bin Yu
  • Yu Ma
  • Yufu Wu

Abstract

The debris flow, which was triggered in the Wenjia Gully on August 13, 2010, is an extreme example of mass movement events, which occurred after the Wenchuan earthquake of May 12, 2008. This Earthquake triggered in the Wenjia Gully the second largest co-seismic landslide, which can be classified as a rockslide-debris avalanche. A lot of loose sediments was deposited in the basin. In the main so called Deposition Area II of this landslide, with a volume of 30 × 10 6 m 3 , flash floods can easily trigger debris flows because of the steep bottom slope and the relative small grain sizes of the sediments. The largest debris flow of August 13, 2010 destroyed the most downstream dam in the catchment during a heavy rain storm. The debris flow with a peak discharge of 1,530 m 3 /s and a total volume of 3.1 × 10 6 m 3 caused the death of 7 persons, 5 persons were missing, 39 persons were injured and 479 houses buried. After three rainy seasons, only 16 % of the landslide-debris deposition was taken away by 5 large-scale debris flow events. Since the threshold for rainfall triggered debris flows in the Wenjia Gully and other catchments drastically decreased after the Wenchuan Earthquake, new catastrophic events are expected in the future during the rainy season. Copyright Springer Science+Business Media B.V. 2013

Suggested Citation

  • Bin Yu & Yu Ma & Yufu Wu, 2013. "Case study of a giant debris flow in the Wenjia Gully, 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. 65(1), pages 835-849, January.
    • Handle: RePEc:spr:nathaz:v:65:y:2013:i:1:p:835-849
    DOI: 10.1007/s11069-012-0395-y
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    References listed on IDEAS

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    1. Chia-Nan Liu & Hsiao-Fung Huang & Jia-Jyun Dong, 2008. "Impacts of September 21, 1999 Chi-Chi earthquake on the characteristics of gully-type debris flows in central Taiwan," 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. 47(3), pages 349-368, December.
    2. Peng Cui & Xiao-Qing Chen & Ying-Yan Zhu & Feng-Huan Su & Fang-Qiang Wei & Yong-Shun Han & Hong-Jiang Liu & Jian-Qi Zhuang, 2011. "The Wenchuan Earthquake (May 12, 2008), Sichuan Province, China, and resulting geohazards," 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. 56(1), pages 19-36, January.
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    Cited by:

    1. Rakesh Bhambri & Manish Mehta & D. Dobhal & Anil Gupta & Bhanu Pratap & Kapil Kesarwani & Akshaya Verma, 2016. "Devastation in the Kedarnath (Mandakini) Valley, Garhwal Himalaya, during 16–17 June 2013: a remote sensing and ground-based assessment," 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. 80(3), pages 1801-1822, February.
    2. Rakesh Bhambri & Manish Mehta & D. P. Dobhal & Anil Kumar Gupta & Bhanu Pratap & Kapil Kesarwani & Akshaya Verma, 2016. "Devastation in the Kedarnath (Mandakini) Valley, Garhwal Himalaya, during 16–17 June 2013: a remote sensing and ground-based assessment," 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. 80(3), pages 1801-1822, February.
    3. 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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