The Research On The Meta-modeling Method Of Urban Water Environment Pollution

With the rapid development of society and economy and the acceleration of urbanization, environmental pollution has become more and more serious. As environment pollution involves many factors, it is a complex problem. At present, there has not any universal environment pollution model to realize the modeling of different environment pollution.According to these problems, this paper first carries on deep research to the evaluation method of urban water environment pollution and the typicall model of water quality. From the research and compare of prediction models of water quality includes one-dimensional water quality model, two-dimensional water quality model, BOD-DO water quality model and complete and non-complete mixing models which is applicable to lakes, the knowledge of the model of urban water environment pollution can be obtained.Next, in order to realize the reusability of the model of urban water environment pollution, meta-modeling is used to achieve integration of model in a higher level, and this paper rearches the relationship of the model of urban water environment pollution and the meta-model on the basis of the knowledge in the model of urban water environment pollution,and then presents the method and procedore of meta-modeling; gets the basic factors of meta-model though the abstraction of the model of urban water environment pollution. In addition, using relative modeling language and software, the meta-model of urban water environment pollution is realized and using the example to explain the process from the meta-model to model to object.Finally, this paper develops the management system of the modeling of urban water environment pollution on the basis of meta-model- CWEMMS, designs the basic class and the system mode of four-layer meta-model basis on the main modules and the meta-model library of water environment which includes the meta-model of river pollution, the meta-model of lake pollution and the meta-model of underground water pollution and then realizes the basic function of CWEMMS.