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Experimental analysis of wave deformation and bottom flow under wave current interaction in the river mouth

机译：河口波浪作用下波浪变形与底流的实验分析

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摘要

A river mouth is a physically dynamic area. In this study, we analyze the hydrodynamic characteristics of this area by performing hydraulic experiments to investigate wave-current interaction by building a river mouth model in a 3-D wave basin. Using the results of these hydraulic experiments, we analyze the hydrodynamic characteristics of the region in which wave-current coexist in the river channel and the vicinity of the river mouth. We observe that, in a river channel, the turbulence flow field develops more rapidly when both waves and current are present as opposed to a situation where no current exists. This contributes to the wave energy loss, resulting in wave attenuation. This phenomenon is more obvious when the ratio between the current velocity and wave celerity, V-c/C-i increases. From the wave reflection measurements, we observe that the reflection coefficient increases as V-c/C-i increases. This causes wave attenuation in the wave-current interaction. We observe the changes in the wave heights, bottom flow, and horizontal velocity distributions in the areas where wave-current coexist in the river mouth. In particular, the measured horizontal velocity distribution shows the influence of the flow field on the combined effects of the wave and current velocity components. We observe that there is a close relationship between the wave-current interaction and sediment transport near the river mouth.
机译：河口是一个物理动态区域。在这项研究中，我们通过进行水力实验来分析该区域的水动力特性，以在3-D波盆地中建立河口模型来研究波流相互作用。利用这些水力实验的结果，我们分析了在河道和河口附近共存波流的区域的水动力特性。我们观察到，在河道中，当波浪和电流同时存在时，湍流场发展得更快，这与不存在电流的情况相反。这导致波能量损失，导致波衰减。当电流速度和波速V-c / C-i之比增加时，这种现象更加明显。从波反射测量中，我们观察到反射系数随V-c / C-i的增加而增加。这导致波-电流相互作用中的波衰减。我们观察到在河口波流共存的地区，波高，底流和水平速度分布的变化。特别是，测得的水平速度分布显示了流场对波速和当前速度分量的组合效应的影响。我们观察到波流相互作用与河口附近的泥沙输送之间存在密切的关系。

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