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2022 Vol. 28, No. 6
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ZHANG Xianzheng, TIE Yongbo, LI Guanghui, YANG Chang, LU Jiayan, LU Tuo. 2022. Characteristics and risk assessment of debris flows in the Wandong catchment after the MS 6.8 Luding earthquake. Journal of Geomechanics, 28(6): 1035-1045. doi: 10.12090/j.issn.1006-6616.20222827
Citation: ZHANG Xianzheng, TIE Yongbo, LI Guanghui, YANG Chang, LU Jiayan, LU Tuo. 2022. Characteristics and risk assessment of debris flows in the Wandong catchment after the MS 6.8 Luding earthquake. Journal of Geomechanics, 28(6): 1035-1045. doi: 10.12090/j.issn.1006-6616.20222827
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Characteristics and risk assessment of debris flows in the Wandong catchment after the MS 6.8 Luding earthquake

  • 1.

    Chengdu Center of China Geological Survey, Chengdu 610081, Sichuan, China

  • 2.

    Technology Innovation Center for Risk Prevention and Mitication of Geohazard, Ministry of Nature Resources, Chengdu 611734, Sichuan, China

  • 3.

    Observation and Research Station of Chengdu Geological Harzards, Ministry of Natural Resources, Chengdu 610000, Sichuan, China

  • 4.

    Graduate School of Chinese Academy of Geological Sciences, Beijing 100083, China

  • 5.

    China University of Geosciences, Beijing 100083, China

    • Fund Project: The research is financially supported by the National Natural Science Foundation of China (Grant U20A20110-01) and the Geological Survery Project of the China Geological Survey (Grant DD20221746)
More Information
Received Date:  27 September 2022
Revised Date:  12 October 2022
Publish Date:  28 December 2022
    Abstract

  • On Sep. 5, 2022, an MS 6.8 earthquake struck Luding County. The earthquake triggered large amounts of co-seismic landslides, which blocked the Wandong River for nearly 24 hours. Field surveys, image interpretation, spatial statistics, and hydro-logical calculations were used to investigate the characteristics of co-seismic landslides and the risk of debris flow following the earthquake. According to the findings, co-seismic landslides are primarily found in areas of earthquake intensity IX, and their sizes are typically small and medium. They are distributed along both sides of the channel, particularly on both sides of the thin ridge facing the air. The distance from the fault and slope controls the distribution of co-seismic landslides. The volume of debris flow runout in the Wandong catchment may be twice that of the debris flow prior to the earthquake. On this basis, the following disaster prevention and mitigation suggestions were put forward. The risk of runout debris flow in the catchment should be strengthened; The value of triggering rainfall of debris flow should be obtained as soon as possible through comprehensive monitoring and early warning; The scale amplification factor of debris flow should be fully considered in the design of debris flow prevention and control projects. This research can be used as a scientific reference for disaster prevention and mitigation of post-earthquake debris flows.

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