Numerical Simulation On Transportation And Diffusion Of Oil Spill In Beibu Gulf Of Guangxi

With the rapid development of Guangxi Beibu Gulf coastal economy,the petrochemical industry will become one of the important industries in Guangxi in the future.With the rise of the petrochemical industry and the increase of the number of ships in and out of Guangxi coastal areas,the risk of large-scale oil spill pollution in the Beibu Gulf sea area will increase relatively.Once the oil spill happens,it will cause the terrible loss to the surrounding ecological environment.Therefore,this paper studies the process of oil spill by numerical simulation,which provides a reliable basis for controlling the development of oil spill accidents and formulating relevant emergency prevention and control measures.Taking Qinzhou Bay as the research area,based on high-precision coastline data and water depth data of Qinzhou Bay,the sea area model is established by SMS.The hydrodynamic model of Qinzhou Bay is established by Mike 21 FM model,and the boundary conditions of Qinzhou Bay model are obtained by the big model to ensure the accuracy and reliability of the model.Study and analyze the hydrodynamic environment of Qinzhou Bay,combined with the local measured data,to ensure that it can accurately reflect the local tide situation,and provide a reliable and effective hydrodynamic environment for the oil spill model.Through MIKE 21 PT model,combined with hydrodynamic model,coupled with wind field,flow field and other environmental factors,a two-dimensional oil spill model is established to study the oil spill movement.Combined with Fay's classical theory,the influence of diffusion coefficient on oil particles is studied.Under the combination of four wind conditions and two tide conditions,the oil particle's drift track and its diffusion are studied.Based on the actual situation of oil spill,the swept area of oil spill is studied under the different point sources,and the effect of oil containment on the treatment of oil spill is also studied.The results show that the diffusion track and sweep area of oil spill are determined by tidal current and wind field.The oil spill at different tide will affect different sea areas,and the wind field can accelerate the diffusion of oil spill.However,the influence of moving point source on the diffusion of oil spill is small.The moving point source can only increase the diffusion area at the initial stage,while the drift and diffusion of oil spill are more affected by the current and wind field.The effect of oil fence is also related to the local tidal environment.Reasonable placement of oil fence can effectively reduce the swept area of oil spill and its impact on the surrounding environment.