Analyzing the Impact of Tidal Currents on Sludge Dispersion in the Coastal Zone of Da Nang City

The demand for designated sites to receive sludge waste from marine and coastal dredging projects is rising in Vietnam. Coastal areas are particularly promising for such purposes. Evaluating the dispersion of submerged sludge in the marine environment is crucial for assessing potential impacts on adjacent ecological zones that require protection. Tidal currents in the proposed discharge area are a significant factor influencing sludge propagation. The results indicate that varying average tidal currents affect horizontal propagation and result in different changes in bottom topography. Simulations demonstrate that underwater mud could dissolve to a great distance from the discharge site when discharged at an average rate of 100,000 m³/month. The study utilized the Telemac3D numerical model, which addressed the problem of sludge dispersion through diffusion and convection and incorporated the TOMOWAC module to solve the issue of wave propagation along the coast. The TELEMAC-3D numerical model is used to solve the problem of sediment dispersion through combined diffusion and advection processes, which has been integrated with the TOMOWAC wave propagation model, which simulates wave dynamics in coastal zones. The combined approach is applied to investigate the impact of mean tidal currents on the dispersal of dredged sediment, considering different discharge timing scenarios.