Turbulent flow mechanisms in meandering channels with sediment transport

IF 1.6 Q3 WATER RESOURCES
S. Sahoo, Anurag Sharma
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引用次数: 0

Abstract

This research aims to investigate the near-bed turbulent flow characteristics in a meandering channel with both mobile bed and immobile bed conditions. Experiments were performed in a prismatic rectangular meandering channel with a non-uniform sand bed of size d50 = 0.523mm. The three-dimensional instantaneous fluid velocity was collected using the Acoustic Doppler velocimeter which will provide important results related to the flow turbulence such as mean flow velocity, turbulence intensity, Reynolds shear stress, turbulent kinetic energy, skewness, kurtosis and turbulent anisotropy. The secondary current flow and the exchange of momentum in the form of turbulence kinetic energy, Reynolds shear stress and turbulent intensity at the inner layer of the flow are identified more in a mobile bed condition as compared to an immobile condition, which causes sediment transport. For the inner layer of the flow, turbulence intensity and turbulent kinetic energy are decreased in magnitude and gradually increase in the outer layer of flow for both the bed conditions. Higher turbulence anisotropy is noticed in the mobile bed condition than in the immobile bed condition, which shows more nonuniformities near the bed level for the mobile bed condition. This study may help in understanding the effect of sediment transport due to a turbulent flow structure in a sinuous alluvial channel.
含泥沙输运的曲流河道湍流机制
本研究旨在研究在流动床和固定床条件下弯曲河道中的近床湍流特性。实验在尺寸为d50=0.523mm的非均匀沙床的棱柱形矩形弯曲通道中进行。使用声学多普勒测速仪收集三维瞬时流体速度,该测速仪将提供与流动湍流相关的重要结果,如平均流速、湍流强度、雷诺剪切应力、湍流动能,偏度、峰度和湍流各向异性。与不动条件相比,流动床条件下的二次流和湍流动能形式的动量交换、雷诺剪切应力和流动内层的湍流强度更容易识别,而不动条件会导致沉积物迁移。对于流动的内层,在两种床层条件下,湍流强度和湍流动能的大小都会降低,而在流动的外层则会逐渐增加。流动床条件下的湍流各向异性比固定床条件下更高,这表明流动床条件在床面附近有更多的不均匀性。这项研究可能有助于理解弯曲冲积河道中湍流结构对泥沙输移的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
2.30
自引率
6.20%
发文量
136
审稿时长
14 weeks
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