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Longitudinal dispersion in wave-current-vegetation flow

机译：波浪-植被流中的纵向弥散

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The flow, turbulence, and longitudinal dispersion in wave-current flow through submerged vegetation are experimentally examined. Laboratory experiments are carried out by superimposing progressive waves on a steady flow through simulated submerged vegetation. The resultant wave-current-vegetation interaction shows strong interface shear with increase in the velocity due to the wave-induced drift. The increase in turbulence in the region of vegetation is found to be about twice higher than in the no-wave case due to the additional mixing by wave motions. Solute experiments are conducted to quantify the wave-current-vegetation longitudinal dispersion coefficient (WCVLDC) by the routing method and by defining length and velocity scales for the wave-current-vegetation flow. An empirical expression for the WCVLDC is proposed. Although the increase in vertical diffusivity is observed as compared with bare-bed channels, the shear effect is stronger, which increases the value of the WCVLDC. The study can be a guideline to understand the combined hydrodynamics of waves, current, and vegetation and quantify the longitudinal dispersion therein.
机译：实验研究了流过水下植被的波流中的流动，湍流和纵向扩散。通过将渐进波叠加在经过模拟淹没植被的稳定流上进行实验室实验。所产生的波流-植被相互作用显示出很强的界面剪切力，这是由于波引起的漂移而导致速度增加的原因。由于波浪运动的额外混合，在植被区域中湍流的增加被发现比无波浪情况下高约两倍。进行溶质实验，通过路由方法并通过定义波浪-电流-植被流的长度和速度尺度来量化波浪-电流-植被纵向弥散系数（WCVLDC）。提出了WCVLDC的经验表达式。尽管观察到垂直扩散率与裸床通道相比有所增加，但剪切作用更强，从而增加了WCVLDC的值。该研究可以作为了解波浪，水流和植被的组合流体力学并量化其中的纵向色散的指南。

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