The Decision Support System For Water Environment Management In Hefei City

Water environment management is a complicated large-scale domain which involves many subjects and factors, and its qualities will directly influence human's daily life and economic development. Decision support system provides a decision-making environment where we can analyze questions, construct models, and simulate the process and effects of decision, it has been an effective and powerful tool in solving some semi-structured and unstructured problems.With the rapid development of geography information system, decision support system can not only solves quantitative problems but also deal well with the uncertain, fuzzy, qualitative information, and help decision-makers to make sensible decision.It is an important tool of information-oriented water environment management for the water environment management decision support system (WEMDSS) which is an effective way to aid water enviorment programming, management and decision.The ideal and method of achieving a regional WEMDSS using GIS is proposed after a research in the development of WEMDSS in domestic and abroad. The design of water environment database and management model base is given. The HFWEMDSS has been designed according the theory of object–oriented programming. The achievements of the research about HFWEMDSS based on GIS are as follows:①The foundation of public database and the sharing of information are realized. By these, all kinds of cartography can be made flexibly according the real need of water enviroment management. And it is easy to update data when needed. The water environment management cartography can be made by using the form of dynamic digital map, JPEG, BMP or EMF which make it faster, more copious and more reliable.②The HFWEMDSS software is developped in Visual C++6.0 using MapX control which leads to a higher efficiency of development. The software achieves a real time, convient and visulable information obtainning, which has a strong data processing ability. And it's easy for the client to use.③Comparing with the traditional management information system, the HFWEMDSS makes full use of the adavantage of spatial data processing ability of GIS and adopts advanced programming language to develop professional function sections which make it meet the need of water management better. Some examples of river water quality evaluation in HeFei are given according the requirements of water quality evaluation. A new method of displaying the result of evaluation is adopted by using the water enviroment management DSS to show the the present water quality situation of rivers in Hefei.④The calculation of water environment capacity and the forecasting of water quality can be done by knowing the relative parameters of the river and using the dynamic water environment capacity model and water quality forecasting model. So we can calculate the permitted pollution emission quantity. It is helpful to aviod the environmental aggravation caused by blind pollution emission.