Two dimensional numerical modeling of oil spill fate in coastal waters using Telemac-2D

In this study, combined numerical Eulerian-Lagrangian method was used to simulate the movement of and assess the fate of oil spills. Momentum and continuity equations of two-dimensional horizontal flow and transport equations of oil pollution were obtained from Eulerian and Lagrangian methods and solved by a two-dimensional horizontal flow model, Telemac-2D. The finite element method was used for discretizing the governing equations.At the simulation stage of transport process, oil spill velocity which is depended on wind and current speed was computed from net transport model and then substituted into stochastic advection-diffusion model by Lagrangian approach. As a result, the location of the oil spill was provided at different times. It is necessary to point out that the effect of the waves was ignored based on the assumption that coastal currents were weak. At the simulation stage of weathering processes, Fay model was used to model spreading as the most important factor considering gravity and viscosity effects. Then, the surface area of the particles was calculated to solve the evaporation equation. Here, the final evaporation equation was described as a function of oil boiling point and its type. Comparison between results of the present study and Goeury et al. shows that Root Mean Square Error (RMSE) calculated for two-dimensional model in gasolineoil evaporation and dissolution problems are 0.414 and 2.97 respectively which is shown its reasonable accuracy.