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Characteristics of viscous debris flow in a drainage channel with an energy dissipation structure

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Abstract

A new type of drainage channel with an energy dissipation structure has been proposed based on previous engineering experiences and practical requirements for hazard mitigation in earthquakeaffected areas. Experimental studies were performed to determine the characteristics of viscous debris flow in a drainage channel of this type with a slope of 15%. The velocity and depth of the viscous debris flow were measured, processed, and subsequently used to characterize the viscous debris flow in the drainage channel. Observations of this experiment showed that the surface of the viscous debris flow in a smooth drainage channel was smoother than that of a similar debris flow passing through the energy dissipation section in a channel of the new type studied here. However, the flow patterns in the two types of channels were similar at other points. These experimental results show that the depth of the viscous debris flow downstream of the energy dissipation structure increased gradually with the length of the energy dissipation structure. In addition, in the smooth channel, the viscous debris-flow velocity downstream of the energy dissipation structure decreased gradually with the length of the energy dissipation structure. Furthermore, the viscous debris-flow depth and velocity were slightly affected by variations in the width of the energy dissipation structure when the channel slope was 15%. Finally, the energy dissipation ratio increased gradually as the length and width of the energy dissipation structure increased; the maximum energy dissipation ratio observed was 62.9% (where B = 0.6 m and L/w = 6.0).

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Authors and Affiliations

  1. CAS Key Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China

    Jian-gang Chen, Xiao-qing Chen, Hua-yong Chen & Wan-yu Zhao

  2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Tibet, China

    Xiao-qing Chen

Authors
  1. Jian-gang Chen
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  2. Xiao-qing Chen
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  3. Hua-yong Chen
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  4. Wan-yu Zhao
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Correspondence to Xiao-qing Chen.

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http://orcid.org/0000-0001-6001-5413

http://orcid.org/0000-0002-0l77-0811

http://orcid.org/0000-0003-4033-3339

http://orcid.org/0000-0003-4879-7541

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Chen, Jg., Chen, Xq., Chen, Hy. et al. Characteristics of viscous debris flow in a drainage channel with an energy dissipation structure. J. Mt. Sci. 13, 223–233 (2016). https://doi.org/10.1007/s11629-014-3290-z

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  • DOI: https://doi.org/10.1007/s11629-014-3290-z

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