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Volume 34 Issue 2
Apr.  2023
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WANG Xianghongshen，HU Guisheng，YANG Zhiquan，et al. Characteristics of intermediate frequency debris flow and analysis of the hazard of blockage in Hada gully, Weixi County of Yunnan Province[J]. The Chinese Journal of Geological Hazard and Control，2023，34(2): 42-52. DOI: 10.16031/j.cnki.issn.1003-8035.202112037
Citation: WANG Xianghongshen，HU Guisheng，YANG Zhiquan，et al. Characteristics of intermediate frequency debris flow and analysis of the hazard of blockage in Hada gully, Weixi County of Yunnan Province[J]. The Chinese Journal of Geological Hazard and Control，2023，34(2): 42-52. DOI: 10.16031/j.cnki.issn.1003-8035.202112037
shu

Characteristics of intermediate frequency debris flow and analysis of the hazard of blockage in Hada gully, Weixi County of Yunnan Province

  • 1.

    Key Laboratory of Geological Hazard Risk Prevention and Emergency Mitigation, Department of Emergency Management, Kunming University of Science and Technology, School of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming, Yunnan　650093, China

  • 2.

    Key Laboratory of Early Rapid Identification, Prevention and Control of Geological Diseases in Traffic Corridor of High Intensity Earthquake Mountainous Area of Yunnan Province, Kunming, Yunnan　650093, China

  • 3.

    Key Lab of Mountain Hazards and Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, Sichuan　610041, China

  • 4.

    Academy of Plateau Science and Sustainability, Xining, Qinghai　810016, China

  • 5.

    Institute of Exploration Technology, China Geological Survey, Chengdu, Sichuan　611734, China

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  • Received Date: December 28, 2021
  • Revised Date: March 18, 2022
  • Accepted Date: April 05, 2022
  • Available Online: December 26, 2022
    Graphical Abstract
    • Abstract
  • Intermediate-frequency debris flows has the characteristics of high danger and long outbreak period. Human activities can trigger its occurrence and aggravate its disaster severity. When the channel cannot meet the capacity for drainage and water transport, it will cause blockage and endanger the safety of both sides of the strait and even the main river channel. Due to the lack of analysis on the danger of intermediate-frequency debris flows, this paper takes the intermediate-frequency debris flow in Hada Gully, Yunnan Province as an example to explore its characteristics and the danger of its recurrence and channel blockage caused by debris flows and proposes prevention and control suggestions. The results show that the debris flow has a density of 1.62 t/m3, a flow velocity of 4.794 m/s at the outlet of the channel, a peak flow rate of 54.43 m3/s at the channel outlet and a total discharge of 11072.03 m3 for a single occurrence based on the 10% burst frequency. A culvert was constructed in the downstream channel, with a flow capacity of 16.5 m3/s, which is less than the flow rate of a debris flow once in 20 years. Once a large debris flow occurs, there is a risk of blockage. The study found that the hazard level of intermediate-frequency debris flows in Hada gully is highly dangerous, and the history of blockage indicates the possibility of its recurrence and the risk of debris flow blocking the Lapu River.
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