Research On GIS-Based Water Pollution Control Planning

Water pollution is a global problem that has got more and more attentions, and technologies to control water pollution have being developed quickly. Geographic information system(GIS) is a powerful tool in the information times, which has been used in many fields successfully. In this paper, combination between water pollution control planning and GIS is studied. And a GIS-based method of water pollution control planning is developed successfully. The research has expanded the application fields of GIS, and improved the standard of water pollution control planning.GIS technology was applied in every sub-process of water pollution control planning, such as pollution source, pollution load statistic, water quality evaluation, water quality simulation, environment capacity calculation, data management, and planning options selection etc. The spatial database and attribute database are established on the base of GIS and relational database management system respectively , and the connection between spatial database and attribute database is established to make the users manage the pollution sources dynamically. The method of subjection level weighted average is adopted to evaluate water quality of the river. The results of evaluation are illustrated with different colors in the digital map based on the display abilities of GIS. When forecasting water quality, the areas that do not measure up to the planning water quality could be displayed in red color to give alarm to the decision-makers. An open water quality models base is developed and the useful models, such as environmental capacity models, pollution loading rate models, have been programmed so that calculation could be completed automatically. At last, the methods of option simulation and annual cost function are used to compare the planning options in technology and economy. The water quality level of planning options can be illustrated in the digital map visually, to support the decision-makers to make decisions.IIï¿¡2ABSTRACTIn this research, object-oriented database model is adopted to describe the spatial entities. GeoMedia Professional 3.0 is selected as the basic working system to design spatial data's structure and its organization~ and to help to establish spatial database. The relational database management system is used to establish attribute database. The combination between spatial database and attribute database makes the users manage both spatial and attribute data timely, dynamically, and effectively. To test the program , the Fengzui River in Nanchuan City , Chongqing Municipality, is selected as the example and the GIS-based software of Fengzui River water pollution control planning is developed.