Numerical Study on the Far Field Diffusion of Ocean Dumping for Liquid Waste

摘要

The far field phase diffusion of discharging liquid waste into the sea water was investigated in the present study. The diffusion in the far field phase can basically be simulated by the three dimensional turbulent diffusion equations. The moment method is used to integrate the governing equation. A numerical model is developed to solve these moment diffusion equations. The numerical model prediction result is shown in good agreement with the field measurement of Ball and Reynolds. The effects of the current speed and ocean diffusive characteristics on the diffusion of liquid waste concentration are calculated numerically. The calculated results indicate that ocean diffusivity has a strong effect on the diffusion and spread of the liquid waste cloud. A large current speed is favorable to the transport and spread of the liquid waste cloud. The maximum concentration of the liquid waste cloud significantly decays in a few hours after discharging, and the decay rate approaches a constant value after a few decades of hours.