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Hydrodynamic interaction in suspended sediment distribution of open channel turbulent flow

机译：明渠湍流悬浮沉积物中的水动力相互作用

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In the present study, a theoretical model is proposed to predict the vertical distribution of suspended sediment in open channel turbulent flow. We derive our mathematical model based on the six prominent hydrodynamic mechanisms, which are upward sediment flux due to the turbulent diffusion, downward gravitational settling of the sediment, hindered settling phenomenon, secondary current, fluid induced lift force on the suspended particles and the gradient of Reynolds normal stress of the suspended sediment. The importance of the hydrodynamics is described by the changes of suspended sediment concentration profile in terms of the particle-flow interaction caused by those mechanisms. We also address the significance of the co-existence of those mechanisms for estimating the suspended sediment concentration profile. The present model agrees satisfactorily with a wide spectrum of experimental data in available literature. Unlike the previous researchers, we select a broad range of previously published models of vertical sediment concentration distribution for comparison analysis, and the proposed model shows better prediction accuracy which is confirmed by error analysis.
机译：在本研究中，提出了一个理论模型来预测明渠湍流中悬浮沉积物的垂直分布。我们基于六个显着的水动力机理推导我们的数学模型，这六个机理是由于湍流扩散而产生的向上的泥沙通量，泥沙的向下重力沉降，受阻的沉降现象，二次电流，流体对悬浮颗粒的感应升力以及水的梯度。雷诺悬浮泥沙的法向应力。流体动力学的重要性通过悬浮泥沙浓度曲线的变化来描述，这些变化是由这些机理引起的颗粒流相互作用引起的。我们还讨论了这些机制共存对估算悬浮沉积物浓度剖面的重要性。本模型与现有文献中的广泛实验数据令人满意。与以前的研究人员不同，我们选择了范围广泛的先前发布的垂直沉积物浓度分布模型进行比较分析，并且所提出的模型显示出更好的预测精度，这已通过误差分析得到了证实。

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