Hydraulic resistance of flow in channels with cylindrical roughness
Hydraulic resistance of flow in channels with cylindrical roughness
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DOI：
10.1061/(asce)0733-9429(2002)128:5(500
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发表时间：
2002-04
影响因子：
2.4
通讯作者：
Brian M. Stone;H. T. Shen
中科院分区：
文献类型：
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作者：
Brian M. Stone;H. T. Shen
本文介绍了具有圆柱形糙率的明渠水流的水力学试验研究。实验室研究包括一套广泛的水槽实验流与紧急和淹没圆柱形茎的各种大小和浓度。结果表明，水流阻力随水流深度、茎浓度、茎长度和茎直径的变化而变化。通过植被的流动所经历的茎阻力最好用茎之间的最大深度平均速度来表示。基于物理公式的流动阻力，表观通道速度，并在粗糙度和表面层的流速。用本研究和以往研究的水槽资料对公式进行了验证。提出了利用这些公式计算渠道水力条件的方法。
A laboratory study on the hydraulics of flow in an open channel with circular cylindrical roughness is presented. The laboratory study consists of an extensive set of flume experiments for flows with emergent and submerged cylindrical stems of various sizes and concentrations. The results show that the flow resistance varies with flow depth, stem concentration, stem length, and stem diameter. The stem resistance experienced by the flow through the vegetation is best expressed in terms of the maximum depth-averaged velocity between the stems. Physically based formulas for flow resistance, the apparent channel velocity, and flow velocities in the roughness and surface layers are developed. The formulas are validated with the flume data from the present study as well as those from past studies. A method for calculating channel hydraulic conditions using these formulas is presented.