The West Coast Of Bohai Bay Reclamation Area Of Typical Organic Pollutantsmigration Simulation Study

The west bank of Bohai bay belongs to the typical silty coastal zone.At present,reclaiming land from the sea has become an effective means to relieve the strain on land for the needs of economic development.Nangang industrial zone(first-stage)starts building in this context.As a world-class heavy chemical industry,Nangang industrial zone keeps oil storage,refining,etc as the main industry.Reclaiming land from the sea may make the change of shallow groundwater flow field,while the construction and operation of heavy chemical base may affect the hydrogeological environment in the district.Once the pollutants spill,they must cause varying degrees of pollution to the groundwater and soil.Reclaiming land from the sea area has currently been a blank area of hydrogeology job.Therefore,it is necessary to make the hydrogeological conditions of Nangang industrial zone clear,to simulate the migration of this area after the leakage of organic pollutants,and to predict and analysis the possible impacts or hazards caused by groundwater environment.The goal is avoiding the leakage of late pollutants,speculating the influence scope of pollutants in a certain period of time and taking some targeted measures to prevent the spread of pollutants.Besides,according to the geological environmental conditions of the study area and the industrial layout,the subject formulates the specific measures to protect groundwater environment.It is of great realistic significance for the environment protection,pollution prevention and assurance of people's life and property security.The subject,which is based on production project,masters the hydrogeological conditions of the study area through some actual work,such as field investigations,geological drillings,measuring,the tests of sample analysis,and hydrogeological tests,etc.On the basis of the analysis of the hydrogeological conditions,it makes an in-depth analysis and generalization of aquifer structure,boundary conditions,the cycle characteristics of groundwater and the groundwater balance item to set up the hydrogeological conceptual model and numerical model.The subject chooses oil and benzene two typical organic pollutants based on the characteristics of the study area construction project,determines distribution position of the main pollution sources based on the situation design of risk analysis of petrochemical industry in the study area,simulates and predicts the diffusion,excessive scope,maximum migration distance of groundwater pollutant respectively in different time scopes based on the leakage and fire explosion accident.What is more,the simulation results are summarized and the migration regularities of two kinds of pollutants in the groundwater environment in the study area are analyzed.Finally,this subject puts forward some specific measures for prevention and control of groundwater pollution and some protection suggestions of geological environment.