The Dongchuan-type drainage channels are characterized by a series of sills that are embedded in the soil. To minimize the damage due to erosion and abrasion, two debris flow drainage channels were proposed, i.e., Dongchuan-type and V-type drainage channels ( Figures 1A,B), which became widely adopted between the 1960s and 1980s in China. However, since the solid content in debris flows is much larger than that of floods or hyper-concentrated flows, there is significant scouring, impact, and abrasion on the channel. In most cases, the debris flow drainage channels were designed according to the general flood magnitude of flows along flat-bottomed trapezoidal or rectangular cross sections. Hence, civil engineers have designed debris-flow drainage channels similar to spillways in hydropower dams. Due to its relevance to disaster mitigation, several works have been dedicated to the improvement of debris flow drainage channel design.ĭebris flows were previously treated as sand-carrying floods or hyper-concentrated flows. Drainage channels are widely implemented in the basins of downstream areas ( VanDine 1996) with the primary goal of discharging the debris flows. Generally, it works in association with the channel control works ( Chen X. The present work improves the understanding of the effectiveness of step-baffle drainage channels in mitigating debris flows.Ī drainage channel is an engineering mitigation measure designed to protect residents, facilities, and infrastructures from debris flows. However, when only the first baffle in the channel is considered, it is the square baffles that experience the largest impact forces. Trapezoidal baffles generally experience the greatest impact forces relative to both square and triangular baffles. Maximum sediment interception and highest energy dissipation are obtained using the trapezoidal baffle, whereas the triangular baffle exhibits minimal solid interception and the lowest energy dissipation. Results here showed that the square baffles promote highly turbulent flows which in turn result in the highest lift height relative to the triangular and trapezoidal baffles. Specifically, their effects on the flow patterns, sediment transport, energy dissipation, and impact pressure are investigated using flume experiments. In this study, we evaluated the performance of different step-baffle geometries (square, triangle, and trapezoid) in regulating debris flows. However, the current drainage channel designs for guiding rapid debris flows downstream do not account for the variations of the gullies’ gradient and debris flow energy. 5School of Engineering, University of Warwick, Coventry, United Kingtomĭrainage channels are widely used for discharging debris flows into deposition basins or rivers.4German Research Centre for Geosciences (GFZ), Helmholtz Centre Potsdam, Potsdam, Germany. 3CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China.2College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China.of Mountain Hazards and Earth Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences (CAS), Chengdu, China Shuai Li 1,2 Xiaoqing Chen 1,2,3 Jiangang Chen 1,2,3* Hui Tang 4 Yong You 1,2 Huayong Chen 1,2 Wanyu Zhao 1 Xueyu Geng 5
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