Modeling Study of Free Overfall in a Rectangular Channel with Strip Roughness
Modeling Study of Free Overfall in a Rectangular Channel with Strip Roughness
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DOI：
10.1061/(asce)0733-9429(2008)134:5(664
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发表时间：
2008-05
影响因子：
2.4
通讯作者：
Yakun Guo;Lixiang Zhang;Yongming Shen;Jisheng Zhang
中科院分区：
文献类型：
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作者：
Yakun Guo;Lixiang Zhang;Yongming Shen;Jisheng Zhang
本文介绍了实验室试验和湍流数值模拟相结合的结果，研究了床面粗糙度(离散方形条带)和坡度对矩形渠道中自由溢流的影响。研究了各种模型参数，如河床粗糙度、河道坡度和上游来水弗劳德数。模拟、测量和讨论了不同输入条件下槽缘上游的水面线、条带间空腔内的速度场和末端深度(槽缘水深)。结果表明，对于给定的床面粗糙度，粗糙度的相对间距(定义为中心与中心距与条带高度之比)对水流有显着影响。计算结果与实验测量结果吻合较好。
Results from combined laboratory experimental and turbulent numerical modeling studies are presented to investigate the effects of bed roughness (discrete square strips) and slope on the flow over a free overfall in a rectangular channel. A broad range of model parameters such as the bed roughness, channel slope, and incoming upstream Froude number is investigated. The water surface profiles upstream of the brink of the channel, the velocity fields in cavity between two strips, and end depth (water depth at the brink of the channel) are simulated, measured, and discussed for various input conditions. The results show that for a given dimension of bed roughness the relative spacing of roughness (defined as the ratio of the center to center distance to the height of the strip) has a significant effect on the flow. The computational results are in good agreement with the experimental measurements.