Study On Benzene Spill On The Sea Under Different Environment Contidions

With society economy uninterrupted growth, the civil and industrial needed of chemical industry product also is in escalation , chemical industry product dock scale of construction and quantity increase with each passing day thereby also with that.Much entrance and outlet of chemical industry product materials is transported by sea boat and ship mainly. The increasing of chemical industry product's transport definitely lead to the increasing of chemical industry product leakage accident in the sea. In order to predict the track and fate of xylene, the thesis chooses the more inportant benzene and its alkyl derivates in chemical industry product transportation—xylene as the study factor, build the benzene spill model in the sea.After benzene spill, the benzene film will be diffused by the force of gravity, intertia,surface tension and surface turbulent flow, it will also be transmitted with the surface wind and tidal currents. The mark particles are used to simulate the movement of the spilled benzene in the dynamic model of behavior of spilled benzene. It takes the spilled benzene field as a great number of small benzene particle groups. That'to say, the whole benzene film is divided into thousands of independent benzene particles, each of them can be moved or diffused independently, and each of them continues a little benzene. The movement of and diffusion of the whole benzene film is taken as the movement of a lot of benzene groups. So the random diffusion and advection of these mark particles can be used to simulate the behavior of spilled benzene in the sea. And the random diffusion of these mark particles can be simulated by Monte Carlo methods. That's to say, the process of spilled benzene on the sea can be considered as the process of turbulent dispersion, which can be described by Monte Carlo method. The benzene evaporating process is taken as the lose of particles'mass. The distribution of the thickness of the benzene film is calculated by the number and mass of the particles in the very area. The advection,diffsion, evaporation, and weathering of these spilled benzene caused by tidal currents, wind, and turbulent flows have been taken into account in this model.Make use of above basal principle and method , build benzene spilled mathematic model on the sea on the basis of hydrodynamics. It ascertains the evaporation rate by experiments under different environment condtions. The model is used to predict the benzene spill accident in Dongying Harbor. The split steps finite elemnt method is used to simulate the tidal current distribution, and the all-around collected data of hydrogeology of Dongying Harbor is considerd in this model. The tidal current distribution calculated is used as current field input and it's also validated with the data collected in six tidal current observation stations and two tidal curves observation stations. And the predicted results fit well with the observed results, then the model can be used to the predicting. The model is used to predict the track, distance, and the potential scale of the spilled benzene with the force of wind and currents after the accident in Dongying Harbor. It analyses the potential influence caused by spilled benzene.