Evolution of outer bank cell in open-channel bends

Evolution of outer bank cell in open-channel bends
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明渠弯道外岸单元的演变

DOI:
10.1007/s10652-022-09865-2
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发表时间:
2022-05
影响因子:
2.2
通讯作者:
Xinhua Zhang
Xinhua Zhang
中科院分区:
工程技术3区
文献类型:
--
作者:
Bing-dong Li;Xinhua Zhang

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了解外滩单元的发育机理,有利于充分发挥其在冲积河湾凹岸防护中的重要作用。本研究采用弯曲水槽实验和三维重整化群(kappa -ε)闭合数值模式,对外滩单元进行研究。物理实验和数值模拟结果表明:(1)外侧滩胞的形成与中心滩胞的形成并不同时,但往往是在较晚的时间内发生,(2)在急弯弯道中,外侧滩胞的形成是弯道离心力和横向水面坡度压力差共同作用的结果;(3)提出了一个参数β,并证明了该参数能有效地定量评价陡弯明渠弯道外滩单元的出现和水流参数对外滩单元发展的影响。
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.
DOI: 10.1098/rspl.1876.0004
发表时间: --
影响因子: --
作者:
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通讯作者: J. Thomson
DOI: 10.1038/280226a0
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