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Evolution of outer bank cell in open-channel bends
Environmental Fluid Mechanics ( IF 2.2 ) Pub Date : 2022-05-15 , DOI: 10.1007/s10652-022-09865-2
Bingdong Li, Xinhua Zhang

Understanding the developing mechanism of an outer bank cell is benefit for making full use of its important function to protect the concave bank from erosion in alluvial river bends. This study employs a bend flume experiment and a 3D renormalized group with \(\kappa -\epsilon\) closure numerical model to investigate outer bank cells. Results obtained from the physical experiment and numerical simulations elucidate that (1) outer bank cell does not develop at the same time as the occurrence of center region cells, but it often yields later; (2) in sharply curved bends, outer bank cells are originated from the mutual effect of the centrifugal force created by channel bends and the pressure differences due to transverse water surface slopes; (3) a parameter \(\beta\) was derived and also testified effectively for quantitatively evaluating the occurrence of an outer bank cell and influence of flow parameters on the development of outer bank cells in sharply curved open channel bends.



中文翻译:

明渠弯外岸单元的演化

了解外岸单元的发育机制,有利于充分发挥其在冲积河弯中保护凹岸不受侵蚀的重要作用。本研究采用弯水槽实验和具有\(\kappa -\epsilon\)闭合数值模型的 3D 重整化组来研究外岸细胞。物理实验和数值模拟的结果表明:(1)外岸细胞与中心区细胞的发生不同时发展,但往往产生较晚;(2) 在急弯弯道中,外岸单元是由河道弯道产生的离心力和横向水面坡度造成的压力差的共同作用产生的;(3) 一个参数\(\beta\)推导并有效地证明了定量评估外岸细胞的发生和流动参数对急剧弯曲明渠弯道中外岸细胞发育的影响。

更新日期:2022-05-16
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