Research On Drift Of Marine Chemical Spill Forecasting Geographic Information System Based On VB And MapX Control

With the increasing transportation of liquid chemicals in bulks by ships,the risk of the chemicals spill is getting higher and higher.These accidents not only seriously damage the environment of the sea,but also theat the health of people's life.So the reasonable numerical modeling of the spilled chemicals at sea and the display of the numerical results well and truly could provide judgement gist to meet an emergency decision-making of the spilled accidents.We make a research on Drift of Marine Chemical spill Forecasting Geographic Information System Based on VB and MapX control and hope our study can give a little reference for the controlling of Chemicals' polluting accidents.In the thesis,the three-dimensional tide current field model uses POM (Princetion Ocean Model) which developed from the Princetion university of USA. According to the chemical and physical character of each type of spilled chemicals, the chemical spillage model adopted three-dimensional advection diffusion equation to simulate the chemicals spill diffusion.According to Markovian theory,the spreading of chemicals was simulated by Lagrange and Fokker-Planck equation.The GIS component(MapX),an object-oriented programming environment (Visual Basic) and Acess 2000 as an database exploitation and management tool,are used to integrate the numerical models and GIS as a software system.With the help of the GIS module,the conversions of projection and coordinate,the automatic division of calculation grid,and other functions such as zooming in and out the electronic sea map,measuring the distance and area,etc,the tide current display, plotting the track of chemicals spill and other functions can be approved.The simulation results can be visually and quickly expressed on computer.It can be made as a reference to assessment and emergency decision-making for correlative maritime department.