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Circulation cells topology and their effect on migration pattern of different multi-bend meandering rivers
International Journal of Sediment Research ( IF 3.6 ) Pub Date : 2020-05-08 , DOI: 10.1016/j.ijsrc.2020.04.004
Fariba Sadat Esfahani , Alireza Keshavarzi

In meandering rivers, a cross-stream flow, referred to as a secondary current, has important effects on broad spectra of hydraulic/environmental characteristics, running the gamut from river hydrodynamics and geomorphology to stream ecology. The transport equation for vorticity and kinetic energy transfer should be analyzed to specify terms involved in generation of secondary currents. However, there is limited research on scrutinizing these terms in meandering rivers. On the other hand, while rivers are mostly multi-bend, previous studies have been limited to single bends. In the current paper, three physical multi-bend channels representing a strongly curved bend, a mild bend and an elongated symmetrical meander loop are designed in order to unravel mechanisms responsible for forming circulation cells in cross sections. Experiments are carried out in the middle bend of these models. Cross-stream turbulence anisotropy considerably strengthens almost all near bank cells. Moreover, contrary to single sharp bends, multi bend effects hinder the transfer of the kinetic energy in both directions in the entrance section of the strongly curved bend.



中文翻译:

循环单元的拓扑结构及其对不同多弯曲河流迁移方式的影响

在蜿蜒的河流中,横流称为二次流,对水力/环境特性的广谱具有重要影响,其范围从河流水动力和地貌学到河流生态。应分析涡度和动能传递的输运方程,以指定涉及次级电流产生的项。但是,在蜿蜒的河流中研究这些术语的研究很少。另一方面,虽然河流多为多弯道,但先前的研究仅限于单弯道。在当前的论文中,设计了三个物理的多弯曲通道,分别代表强力弯曲的弯曲,温和的弯曲和细长的对称曲折环,以解开负责在横截面上形成循环单元的机制。在这些模型的中间弯曲处进行实验。横流湍流各向异性极大地增强了几乎所有堤岸细胞。此外,与单个急剧弯曲相反,多重弯曲作用阻碍了动能在强弯曲弯曲的入口部分中在两个方向上的传递。

更新日期:2020-05-08
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