EGU2020-2791
https://doi.org/10.5194/egusphere-egu2020-2791
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Comparison on the failure process and mechanism between a debris flow and a landslide dam

Huayong Chen1, Chunran Cao2, Xiaoqing Chen3, and Jiangang Chen4
Huayong Chen et al.
  • 1Key Laboratory of Mountain Hazards and Earth Surface Process/Institute of Mountain Hazards and Environment, CAS,Chengdu 610041, China.
  • 2Institute of Mountain Hazards and Environment, CAS,Chengdu 610041, China/University of Chinese Academy of science, Beijing 100000, China.
  • 3Key Laboratory of Mountain Hazards and Earth Surface Process/Institute of Mountain Hazards and Environment, CAS,Chengdu 610041, China.
  • 4Key Laboratory of Mountain Hazards and Earth Surface Process/Institute of Mountain Hazards and Environment, CAS,Chengdu 610041, China.

Besides the numerous artificial dams, there are some other kind of dams distribute such as the glacier dams, moraine dams, landslide dams, and the debris flow dams in China. Especially, the landslide dams and debris flow ones widely distribute in southwest of China after the M8.0 Wenchuan earthquake. Much attention has been paid to the formation, stability, breach process, and the peak discharge prediction of a landslide dam. However few achievements are obtained on the debris flow dams even if the failure of a debris flow dam has posed great threat to the property and life of residents downstream. In this paper, based on the main difference between a landslide and debris flow dam, experiments were conducted by considering different clay content, the initial water content, and incoming water flow. It indicated that the failure duration of a debris flow dam was about 1.60 times as long as that than that of a landslide dam. The peak discharge at the debris flow dam breach was 5.38 L/s. However, the peak discharge at the landslide dam was 7.50 L/s, which was 1.39 times as big as that of a debris flow dam. Finally, by modifying the existing critical initialization condition for the landslide dams, the critical initialization condition for a debris flow dam was proposed.

How to cite: Chen, H., Cao, C., Chen, X., and Chen, J.: Comparison on the failure process and mechanism between a debris flow and a landslide dam, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-2791, https://doi.org/10.5194/egusphere-egu2020-2791, 2020

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