Characteristics of a Debris-Flow Drainage Channel with a Step-Pool Configuration
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Volume 143, Issue 9
Abstract
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 and . Furthermore, the energy-dissipation ratio varied between debris-flow densities of and . 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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Acknowledgments
This study was supported by the National Key Technology Research and Development Program of China (No. 2014BAL05B01), the Science and Technology Service Network Initiative of CAS (No. KFJ-EW-STS-094), the Youth Innovation Promotion Association CAS (2017426), and the West Light Foundation of CAS. Furthermore, the authors thank the anonymous reviewers and editors for their comments.
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Journal of Hydraulic Engineering
Volume 143 • Issue 9 • September 2017
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©2017 American Society of Civil Engineers.
History
Received: Aug 22, 2016
Accepted: Apr 3, 2017
Published online: Jun 30, 2017
Published in print: Sep 1, 2017
Discussion open until: Nov 30, 2017
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