摘要
在波流共存场中,沿水深可分为波浪边界层,对数层和外层,不同流层内的流速分布规律不同。泥沙运动主要发生在波浪边界层和对数层内,而波要素的变化则直接受外层的流速分布规律影响。在以往的研究中,内、外层的流速分布规律都是分别求解的,并没有提出可适用于全水深的流速分布模式。本文直接从N—S方程出发,引入相应的紊流模式,封闭波流共存场的流动方程和波动方程。从理论上求得了全水深的流速分布,与Kemp和Simons及Van Doorn等人的实测结果非常吻合。
A theoretical model which can predict the full - depth velocity distributions of currents in combined wave and current flows is presented in this paper. The full-depth velocity profiles can be split into three sublayers, i. e. the wave - dominated layer, the logarithmic layer and the upper layer. The sediment transport mainly occurs in the wave-dominated layer and logarithmic layer, while the velocity profile of the upper, layer has the greatest influence on the wave parameters. From Naiver - Stokes equations, the current equations and the wave equations in combined flows are derived. A current eddy viscosity model and a wave eddy viscosity model over full water depth are employed to close the current and wave equations respectively. Coupling the current equations with the wave equations in combined flows,the full - depth velocity distributions are obtained. The prediction results by the theoretical model are in very good agreement with the experimental results from Kemp and Simons, Van Doom.
出处
《海洋通报》
CAS
CSCD
北大核心
1994年第3期1-10,共10页
Marine Science Bulletin
关键词
波流共存场
流速分布
波浪
水深
combined wave and current flow
velocity distribution
turbulent model
