A comparison of overbank flow conditions in skewed and converging / diverging channels
A comparison of overbank flow conditions in skewed and converging / diverging channels
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发表时间：
2010
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通讯作者：
J. Chlebek;D. Bousmar;D. Knight;M. Sterling
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作者：
J. Chlebek;D. Bousmar;D. Knight;M. Sterling
本文研究了几何形状介于纯棱柱型和完全曲流型之间的复式航道中的流动，即：倾斜航道、对称收敛航道和发散航道。分析和比较了两个研究小组(英国伯明翰大学和比利时卢万大学)产生的大量数据的实验结果。根据水位、流速和床面剪切力的测量，可以观察到水流行为的相似之处：(1)由于质量和动量转移而增加的水头损失；(2)收缩泛滥平原上的速度均化；(3)扩张泛滥平原上的速度梯度增加。不同河段之间的水流强迫也不同，从而导致主槽和漫滩之间的流量分配有很大差异。
This paper investigates flows in compound channels with geometries which lie in-between purely prismatic and fully meandering channels cases, namely: skewed channel, symmetrically converging, and diverging channels. Experimental results from large sets of data produced by two research groups (University of Birmingham, UK and Université catholique de Louvain, Belgium) are analyzed and compared. Based on the water level, velocity and bed shear stress measurements, similarities in the flow behaviour are observed: (1) increased head losses due to the mass and momentum transfer; (2) homogenization of the velocity on contracting floodplains; and (3) increased velocity gradient on the expanding floodplains. Differences in the flow forcing from one subsection to another are also observed, resulting in significant differences in the flow distribution between main channel and floodplains.