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首页> 外文期刊>Canadian Geotechnical Journal >Computational investigation of baffle configuration on impedance of channelized debris flow
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Computational investigation of baffle configuration on impedance of channelized debris flow

机译：折流板配置对通道化泥石流阻抗的计算研究

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Channelized debris flows surge downslope in mountainous regions and have large impact forces. Arrays of debris flow baffles are frequently positioned in front of rigid barriers to engage torrents and attenuate flow energy. They are regularly designed on empirical and prescriptive basis because their interaction mechanism is not well understood. Numerical back-analysis of flume experiments using the discrete element method (DEM) is conducted to provide insight on flow interaction with an array of baffles. Varying configurations of baffle height, a second staggered row, and spacing between successive rows are examined. Upstream and downstream kinematics are monitored to capture and compare the Froude number, kinetic energy, and discharge resulting from each baffle configuration. Results from this study reveal that the height of baffles can be categorized relative to the initial approach flow depth (h), namely tall baffles (1.5h) and short baffles (0.75h). Tall baffles are characterized by the development of upstream subcritical flow conditions, whereas short baffles exhibit supercritical upstream conditions. Furthermore, tall baffles facilitate the suppression of overflow, and short baffles lead to excessive overflow that is supercritical in nature. Less flow attenuation occurs as the distance increases both upstream and downstream from each array of baffles. A second staggered row of short staggered baffles is ineffective in reducing debris kinetic energy, whereas tall baffles should be positioned as close as possible.
机译：沟渠状的泥石流在山坡上急速上升，冲击力很大。泥石流挡板的阵列经常位于刚性障碍物的前面，以吸引洪流并衰减流能。由于没有很好地了解它们的相互作用机制，因此经常根据经验和说明性进行设计。进行了使用离散元素方法（DEM）进行的水槽实验的数值反分析，以深入了解与一系列挡板的流动相互作用。检查挡板高度，第二交错行以及连续行之间的间距的各种配置。监控上游和下游运动学，以捕获和比较每个挡板配置所产生的弗洛德数，动能和放电。这项研究的结果表明，挡板的高度可以相对于初始进水深度（h）进行分类，即高挡板（1.5h）和短挡板（0.75h）。高挡板的特征在于上游亚临界流动条件的发展，而短挡板则具有超临界上游条件。此外，高挡板有助于抑制溢流，而短挡板会导致溢流，这在本质上是超临界的。随着距离的增加，每个挡板阵列的上游和下游距离都会减少流量衰减。第二排交错的短交错挡板在减少碎屑动能方面无效，而较高的挡板应放置在尽可能近的位置。

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