Research On Diffusion Simulation Of Ship Pollutant Of Xiamen Port Based On Web GIS And Gaussian Atmosphere Model

With the continuous development of the global economy and foreign trade,port shipping in the global economic development process plays an increasingly important role,but pollutants that ship emitted is also more and more serious.Xiamen port as a major port of China's coastal areas,air pollutants that ship emitted could not be ignored.Therefore,it is of great significance to visualize the pollutants emitted during vessels sailing for the relevant supervisors to make reasonable and correct decision.Web GIS is a technology that uses the Internet to publish GIS geographic data on web pages.Because of its high efficiency,spatial analysis ability and visualization ability,it can combine with the Gaussian atmospheric diffusion model of pollutant to simulate the spatial distribution and spatial variation of the pollutants' concentration during navigation.This thesis mainly takes the Xiamen Port as the object of the research.It builds a database of the vessels by designing and realizing web crawlers to get the data of the vessels that go in and out of the Xiamen Port.Then it estimates the pollutants emission rate of the vessels to calculate the total amount of the pollutants.By study of the Gaussian line source atmospheric diffusion model,the Gaussian line source atmospheric diffusion model of the emission pollutants' concentration of ship during sailing in Xiamen Harbor is established.Then the concentration distribution on the Gaussian plane is reflected on Web GIS after coordinate transformation,and achieve the dynamic simulation of pollutants diffusion.This paper uses Intellij IDEA as a development environment,and uses java language to programming to achieve a multi-threaded network crawler system for crawling the ship data,and the ship data using MySQL database to save,and choosing Spring boot as the background development framework for designed the Gaussian atmospheric diffusion model to calculate the concentration of pollutants.MyBatis is used as a persistence layer development framework for the interaction between the business logic layer and the database.Front-end visualization is implemented by calling the Baidu Maps API.Through their combination the dynamic simulation of the pollutant in the atmosphere during ship navigation in Ximen Port is realized.