ENERGY DISSIPATION OF WAVE-UNIFORM CURRENT OVER A RIGID POROUS MEDIA WITH FINITE THICKNESS

Proceedings of the International Conference on Coastal Engineering

Hung-Chu Hsu³  Jing-Hua Lin³  Yang-Yih Chen¹  Jin-Li Yu¹  Guan-Yu Chen² 

[1] Tainan Hydraulics Laboratory;Department of Oceanography, National Sun Yat-Sen University;Tainan Hydraulics Laboratory,International Wave Dynamics Research Center (IWDRC), National Cheng-Kung University

关键词: wave-current interaction;    rigid porous medium;    nonlinear-unsteady porous flow model;    energy dissipation.;   

DOI  :  10.9753/icce.v34.waves.19

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

The linear wave theory and the nonlinear-unsteady porous flow model are applied to analyze the energy dissipation and the bed pore water pressure induced by the interaction of wave, uniform current and porous bottom without considering the nonlinear waves and the viscosity effect inside the boundary layer. In this model, the linear, inertial and turbulent resistances are combined into a linearized resistance coefficient and the present system can be analyzed by a linear boundary value problem. The numerical result is quite agreement with the existing experimental data. It shows that the energy dissipation is reduced by the Doppler shift and the distribution of energy loss moves to the lower relative water depth region in the wave-following current. On the other hand, the bed pore water pressure in the wave-following current is always lager than that in the pure wave and the wave-opposing current.

【 授权许可】

Unknown