Study On Sudden Water Pollution Accidents Simulating And Predicting System In Ma' Anshan Part Of Changjiang River Based On Gis Theory

Sudden water pollution accidents accumulated great attention of the society for the characteristics of bursting suddenly and spreading fast. The government environmental protection department was always in a dilemma because of lacking effective predicting and monitoring methods while sudden water pollution accidents happen. So the establishment of sudden water pollution accidents simulating and predicting system is of great significance. In order to establish a sudden water pollution accidents simulating and predicting system in ma'anshan part of changjiang river, several correlative theories were studied systemically in this paper which includes geography information system theory, water environment mathematical model theory and database theory. What we studied mainly in this paper is as follows.Through comprehensive analysis of the aim of establishing sudden water pollution accidents simulating and predicting system and its functional features which based on the characteristics of sudden water pollution accidents, technical route of developing this system was confirmed. Using water environment mathematical model as theoretical basis and MATLAB software as tool to solve the mathematical models, sudden water pollution accidents simulating and predicting system was developed with ArcEngine components in Visual Studio 2008.NET software developing environment. At the same time, a database was built with Access2003 software to provide decision support information.1-dimension and 2-dimension water environment mathematical models and its analytic solutions were introduced. Interactive user interfaces based on 1-dimension and 2-dimension water environment mathematical model analytic solutions were designed with the help of MATLAB Guide and the analytic solutions were visualized dynamically and statically in a rectangular coordinate system. Considering the disadvantages of analytic solutions visualization performance in a rectangular coordinate system, we tried to achieve visualization in a GIS AxmapControl control by means of changing coordinate system and drawing isopleths.A database was created including fundamental geography information, fundamental environment information and attribute information which was used for simulating and predicting sudden water pollution accidents. A database management system was also developed and connected to the database to complete adding, deleting, and altering all this information.