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Characteristics of a Debris-Flow Drainage Channel with a Step-Pool Configuration

Chen, Xiaoqing / Chen, Jiangang / Zhao, Wanyu / Li, Yun / You, Yong

Theoretical analysis and experimental testing of a debris-flow drainage channel with a step-pool configuration are conducted in this paper. The design conditions of the drainage channel with step-pool configuration were obtained by theoretical analysis, including the design shape of the step-pool configuration, design slope of the step section, and total length of a single step-pool configuration. In addition, the correction coefficients of the debris-flow jet length were obtained with different debris-flow densities by comparing the experimental and calculation results. Moreover, the debris flow repeats an acceleration-deceleration motion in the drainage channel to achieve a balanced discharge without scouring or deposition. At the downstream of the step-pool configuration, the average debris-flow velocity decreased by approximately 28 and 40% with debris-flow densities of $ρ = 1,700$ and $2,000 kg / m^{3}$ . Furthermore, the energy-dissipation ratio varied between debris-flow densities of $ρ = 1,700$ and $2,000 kg / m^{3}$ . Finally, the authors discuss different types of drainage channels in practical debris-flow hazard-mitigation engineering and parameter variations of these drainage channels.

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Characteristics of a Debris-Flow Drainage Channel with a Step-Pool Configuration

Chen, Xiaoqing / Chen, Jiangang / Zhao, Wanyu / Li, Yun / You, Yong

Theoretical analysis and experimental testing of a debris-flow drainage channel with a step-pool configuration are conducted in this paper. The design conditions of the drainage channel with step-pool configuration were obtained by theoretical analysis, including the design shape of the step-pool configuration, design slope of the step section, and total length of a single step-pool configuration. In addition, the correction coefficients of the debris-flow jet length were obtained with different debris-flow densities by comparing the experimental and calculation results. Moreover, the debris flow repeats an acceleration-deceleration motion in the drainage channel to achieve a balanced discharge without scouring or deposition. At the downstream of the step-pool configuration, the average debris-flow velocity decreased by approximately 28 and 40% with debris-flow densities of $ρ = 1,700$ and $2,000 kg / m^{3}$ . Furthermore, the energy-dissipation ratio varied between debris-flow densities of $ρ = 1,700$ and $2,000 kg / m^{3}$ . Finally, the authors discuss different types of drainage channels in practical debris-flow hazard-mitigation engineering and parameter variations of these drainage channels.

Characteristics of a Debris-Flow Drainage Channel with a Step-Pool Configuration

Chen, Xiaoqing / Chen, Jiangang / Zhao, Wanyu / Li, Yun / You, Yong

Theoretical analysis and experimental testing of a debris-flow drainage channel with a step-pool configuration are conducted in this paper. The design conditions of the drainage channel with step-pool configuration were obtained by theoretical analysis, including the design shape of the step-pool configuration, design slope of the step section, and total length of a single step-pool configuration. In addition, the correction coefficients of the debris-flow jet length were obtained with different debris-flow densities by comparing the experimental and calculation results. Moreover, the debris flow repeats an acceleration-deceleration motion in the drainage channel to achieve a balanced discharge without scouring or deposition. At the downstream of the step-pool configuration, the average debris-flow velocity decreased by approximately 28 and 40% with debris-flow densities of $ρ = 1,700$ and $2,000 kg / m^{3}$ . Furthermore, the energy-dissipation ratio varied between debris-flow densities of $ρ = 1,700$ and $2,000 kg / m^{3}$ . Finally, the authors discuss different types of drainage channels in practical debris-flow hazard-mitigation engineering and parameter variations of these drainage channels.

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Title:

Characteristics of a Debris-Flow Drainage Channel with a Step-Pool Configuration

Contributors:

Chen, Xiaoqing (author) / Chen, Jiangang (author) / Zhao, Wanyu (author) / Li, Yun (author) / You, Yong (author)

Published in:

Journal of Hydraulic Engineering ; 143

Publication date:

2017-06-30

ISSN:

0733-9429 , 1943-7900

DOI:

https://doi.org/10.1061/(ASCE)HY.1943-7900.0001352

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

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