Diffusion, Dispersion Coefficient. Under Wave Flow Vertical Structure And Contaminants

Marine environmental protection is one of the important problems to be solved urgently. Study on wave, current, the interaction between them and other complicated dynamic factors and their influence on the pollutant convection and diffusion is significant to exploit the offshore resources, and protect coastal environment, therefore more and more countries have paid attention to it.The interaction between wave and current is the important section in the coastal environmental problems. In the recent years, the experimental research indicates that there is obvious difference in the average velocity distribution between the wave with following current and the wave with opposing current. The difference is caused by the interaction of wave and current. The scholars inside or outside China have done many researches and made some achievements, while the vertical structure and the diffusion and dispersion of pollutants under the interaction of wave and current are still less considered. Therefore, some elementary work has been investigated around these areas in this paper.(1) Based on the Navier-Stokes equations, a 2-D all-depth numerical model of wave and current is developed to study the flow structure inside and outside the boundary layer. The numerical results of the model are compared with the experimental data given by Van Rijn and Klopman. It is showed that the model proposed is reasonable and feasible.(2) Based on the model proposed in this paper, the solution to pollutants' turbulence diffusion coefficient is developed. The solution is used in the Van Rijn's experiments. The comparison between the results and Van Rijn's empirical formula and the experimental data shows that the solution proposed is reasonable.(3) Based on the all-depth numerical model of wave and current and the solution of pollutants' turbulence diffusion coefficient, the solution of pollutants' dispersion coefficient under the interaction of wave and current is developed. The comparison between calculation and the experimental data given by Kemp and Simons shows that the solution proposed is reasonable.