In the present study, the two-dimensional tidal current and oil spill numerical model was established by using MIKE21/SA (Spill Analysis). After validation, the model was applied to simulate the diffusion of the oil spill under the second phases of the reclamation project in Bodaozui sea area. The influence of the wind and tide conditions were also analyzed. The results showed that the particles reached to the observation points faster during the ebb tide than the flood tide. The diffusion area of the oil spill was also larger during the flood tide. Under the condition of calm wind and flood tide, the particles reached Yangshan temple and Yangshan scenic zone after 19-21 hours. The diffusion area can increase to the maximum value of 1040.58 km2 after 72 hours. While under the wind directions of SE, NNE and NNW during flood and ebb tides, the oil particles were unable to spread out of the bay due to the interception of the breakwater, but adhered to the south break water and the reclamation area instead. The surrounding area outside the breakwater was not affected by the oil spill.
Oil spill has become a worldwide and the most destructive form of pollution to the marine ecological environment over the past few decades (Zhang et al., 2006). Oil spill is accidental and can have disastrous ecological and social consequences(Xu, 2006). The oil can penetrate into the structure of the plumage and threat the survival of seabirds. In addition, the direct toxicity of the oil spill can cause the death of fish, shrimp and shellfish in the surrounding area. When the oil spill enters to the shore area, it will affect the reserved wetland and coastal scenery. Besides, serious oil spill can cause fire and explosion, which cause damage to the ship or offshore facilities, and even cause injuries and deaths (Yu et al., 2017). Therefore, it is necessary to establish numerical and physical models to simulate, analyze and forecast the polluted range of the oil spill. The modeling work are also has great significance to the planning for the scientific emergency rescue and cleanup after an oil spill accident.
