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Bed Shear Stress and Turbulence Characteristics Under Solitary Waves

Author(s): Pengzhi Lin, Haijiang Liu, Dandan Chen, Fang He, Xiaochun Tang, Xiaozeng Zhao

Linked Author(s): Pengzhi Lin

Keywords: Bed shear stress, solitary wave, viscous sub-layer, LDV, BSL k�? model

Abstract: Bed shear stress and turbulence under waves are of fundamental importance to understand sediment transport and bed morphology in coastal waters. In this study, the experiments were conducted to reveal the characteristics of bed shear stress and turbulence under solitary waves. Three cases corresponding to laminar and turbulent boundary layers respectively were investigated. A 2D Laser-Doppler-Velocimetry (LDV) was used to measure the velocity profiles across the water depth and the information of turbulence kinetic energy was extracted from the measured velocities for turbulent case. A new method of finding the wave-induced bed shear stress over a smooth bed from the measured velocities within or near the viscous sub-layer was developed. The experimental data of velocities, bed shear stress, and turbulence kinetic energy were compared to the available theories and the numerical results obtained from a Reynolds-Averaged Navier-Stokes (RANS) equations model with a BSL k�? turbulence closure. The relationship between the bed shear stress and turbulence was discussed


Year: 2017

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