Assessment Of Marine Eco-environmental Safety In Zhejiang Province Based On BP

In recent years,countries around the world have paid high attention to the safety of marine ecological environment.At the Nineteenth Congress of the CPC,China has also put forward the road to speed up the construction of a powerful marine country.Although the overall area of Zhejiang Province accounts for a small proportion of the country,the sea area is vast,the length of coastline accounts for about 1/3 of the country’s top,and the beach resources are the third in the country.Relying on the above unique geographical environment and excellent marine resources,Zhejiang’s marine gross product exceeded760 billion yuan in 2017.At the same time,it also put forward new development requirements for marine ecological environment security.Especially since the 13 th Five-Year Plan put forward to accelerate the transformation of the mode of marine economic development and promote the coordination of regional economy,society and marine ecological environment,the necessity and significance of marine ecological environment safety assessment in Zhejiang Province have been highlighted.The evaluation of marine ecological environment security in Zhejiang Province takes the sea area within the administrative division of Zhejiang Province as the research object.The relevant data of the ocean in the past ten years from 2007 to 2017 are selected.The relevant factors affecting the marine ecological environment security are screened and defined by using ISM interpretative structure model and relevant theories of marine ecology.Thirty basic indicators were selected from three aspects of marine ecological carrying capacity,ecological footprint and disturbance factors to construct the evaluation index system of marine ecological environment security in Zhejiang Province.This paper calculates the index weight by using the method of comprehensive index evaluation combined with the analytic hierarchy process and the entropy weight method,and evaluates the marine ecological environment security of Zhejiang Province by using BP artificial neural network model.The result shows that the marine ecological environment security of Zhejiang Province is in a safe range of three-level security level from 2007 to2017,and the security level has changed well in the near future.The distance from thesecond-level security level is only 0.022.However,if the disturbance factors are removed,the ocean carrying capacity will approach the "saturation" state,which needs to arouse people’s attention to the safety of marine ecological environment.On the basis of the above results and the actual situation of Zhejiang Province,practical countermeasures and suggestions are put forward to prevent marine pollution,restore marine ecology,improve marine early warning mechanism and optimize marine industrial structure.