Study On Decision Support Technology Of Oil Spill Emergency Response In Liaodong Bay

Firstly,marine oil spill accidents with characteristics of suddenness,drifting diffusivity and serious harmfulness happen more frequently in recent years.In order to discover the oil spill in time,understand of its drifting diffusivity and formulate reasonable emergency resource scheduling plan,decision support model of vulnerability zoning,hydrodynamic numerical simulation and optimization of emergency resources allocation of marine oil spill were built.Secondly,based on the platform of GIS integration and development technology,the decision support system for the emergency response of marine oil spill was developed.And the simulation case of the oil spill accident in eastern sea area of Liaodong bay demonstrates the function of the system.(1)Decision support model of vulnerability zoning of marine oil spill At first,the present situation of the monitoring technology of marine oil spill in China was summarized.The reasons why it was difficult to detect marine oil spill in time and give warning were analyzed,and the idea of monitoring based on the marine oil spill vulnerability zoning were put forward.Next in importance is that MC-AKAM model was constructed by screening of marine oil spill vulnerability index system(OSVI)with Monte Carlo,adaptive resonance theory and K-means algorithm.And it was applied to the eastern sea area of Liaodong Bay zoning based on the characteristics of marine oil spill vulnerability.The marine zone was divided into five regions of very low level,low level and middle level,high level,very high level through model calculation.The zoning results can be used as the scientifically and specifically basis to adjust and lay out the monitoring stations in actual oil spill monitoring process.It could effectively improve the oil spill monitoring and warning ability and reduce the economic and environmental impact.(2)Decision support model of hydrodynamic numerical simulation of marine oil spillThree-dimensional numerical simulation of the oil-film characteristics was made by using the Delft3D-PART model.The characteristics of oil-film hydrodynamic drift-diffusion within the both cases of single point and multi-point oil spill were simulated.Not only taking the simulation case of oil spill accident in the eastern sea area of Liaodong Bay as an example,but also taking the concentration of petroleum pollutants prescribed by "the People’s Republic of China marine water quality standard(GB3097-1997)" as the reference standard,the time spent by the oil films of 0.05mg/L isoline concentration under different conditions drift and diffuse to the edge of environmental sensitive targets was analyzed.This time indicates the latest time of the oil spill emergency response.Therefore,the distribution,the trajectory of drifting diffusivity,influence range and final destination of oil in water can be mastered by dynamics numerical simulation of marine oil spill and can be reference for emergency management of marine oil spill.(3)Decision support model of optimization of emergency resources allocation of marine oil spillIn the process of oil spill emergency response,another key point is the disposal and recovery of oil spill.The recovery efficiency of oil spill emergency equipment is often related to the oil film thickness,which is a dynamic variable in the oil spill recovery process,consequently,in order to maximize the recovery of oil slicks,emergency equipment with different recovery efficiencies needs to be scientifically configured.Base on the premise of "the shortest emergency time and the satisfaction of demands for emergency equipment’,using mixed integer nonlinear dynamic programming method(DMINLP),this paper has discussed that the dynamic function relationship between oil spill recovery efficiency and oil film thickness and the DMST-VW model was built.It was applied to the calculation of emergency equipment allocation and optimization in the simulation case of the oil spill accident in eastern sea area of Liaodong bay.The optimization results of the emergency equipment allocation under two conditions of single point and multi-point oil spill were analyzed,and the results show that the spill oil recovery rate can reach more than 80%through the DMST-VW model.The high recovery efficiency can effectively lower the impact of marine marine ecological environment.(4)Decision support model integration for emergency response of marine oil spillIn order to improve the comprehensive management level of marine oil spill emergency response,combining the geographic information system technology(ArcGIS)with emergency decision support technology(DSS),ArcGIS file geographic information database was established.Meanwhile,taking Visual studio.NET and ArcGIS Engine as the development platform,the emergency response comprehensive decision support system(OSDSS-GIS)of Liaodong Bay marine oil spill was developed by using C#language program.The integration and application visualization research of oil spill emergency decision support model was realized.The main functions of OSDSS-GIS system were demonstrated,including system login,marine oil spill emergency data query and decision support model application in the case of Liaodong bay oil spill accidenet.