PIANC Smart Rivers 2022

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The wave-current combined bottom boundary layer model is very significant for the study of the bottom boundary layer. It can be used to study and analyze the bottom roughness on the movable bed, the geometric characteristics and evolution of waves formed by waves or wave current combination, and the relationship between bottom shear stress and sediment transport in the bottom boundary layer. The wave-current interaction is expected to play a dominant role in the balance of low-frequency motion. For a long time, many scholars have studied the eddy viscosity profile and analyzed the interaction mechanism between it and the bottom stress. Among them, Style and Glenn concluded after data analysis that it is important to study the bottom boundary layer by analyzing the mechanism of the effect of different forms of eddy viscosity profiles on the estimation of the bottom stress. In this paper, the wave shear velocity and the current shear velocity, which are two internal parameters of the wave-current bottom boundary layer, were calculated by the model with a two-layer continuous eddy viscosity profile, a three-layer continuous eddy viscosity profile, and a widely used two-layer discontinuous eddy viscosity profile, respectively. Then, the ratio of wave shear velocity to total velocity  and the ratio of current shear velocity to total velocity  were compared and analyzed. The comparison of these three different forms of eddy viscosity profiles can be used to analyze the mechanisms by which different forms of eddy viscosity profiles outside the wave boundary layer affect the estimation of the stress associated on the bottom bed.

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