| Water environmental capacity involves the ecological balance and the chemical circulation of the earth, in which, the laws of pollutant movement, transformation and storage in the environment are reflected and so is the endurance of the environment against the pollution in specific functional condition. So it is a magnificent basic theoretical problem. Meanwhile, it is also a very important problem of the application. In practice, water environmental capacity provides basis for the objective management of water environment and it is the environmental binding condition of water environmental planning and the key technology support to control the total quantity of the pollutant. Much attention has already been put to the study on water environmental capacity in the circle of environment in China, which has been becoming an important part of the theoretical system of environmental management.On the basis of the fundamental theory of such subjects as Environmental Planning, Environmental Quality Assessment, Water Environment, Water Environmental Chemistry, Water Dynamics, this paper provides the comprehensive exposition and analysis of water environmental capacity of the rivers in Kaifeng with the methods of qualitative analysis and quantitative analysis. Understanding the situation of water quality and the tendency of water quality change is the base of studying on the water environmental capacity, so the author takes the water quality change as a part of the study, and puts forward relevant optimization measures and methods on the point of improving the water quality in Kaifeng. Apart from the introduction, this thesis can be divided into five parts:Part â… the development of the study on water environmental capacity at home and abroad In this part, the fundamental theory of water environmental capacity, the models of water quality and the development of the theoretical and applied study on waterenvironmental capacity at home and abroad are introduced. The author goes further into the conception, influential factor, classification and application of water environmental capacity. The present situation of the study on the water environmental capacity of the rivers in Kaifeng is generally introduced and the shortcomings and the significance of the study are also pointed out.Part â…¡ the general introduction of the research region (Kaifeng)The natural environmental conditions and social and economic factors are related to the study. So this part is the general introduction of the natural environmental conditions, the social and economic factors and the water environmental quality in Kaifeng.Part â…¢ the analysis of the trend of the water quality change of the rivers in Kaifeng In this part, the water quality of the rivers in Kaifeng is assessed based on the model of the fuzzy comprehensive evaluation. After comparing the water quality of Kaifeng's rivers in 1984 and 1997, the author gets a conclusion of the change tendency of water quality. And that is the base of the study on water environmental capacity of the rivers in Kaifeng. The analysis of the present water pollution of the rivers in Kaifeng and the main pollutant paves the way for choosing the suitable model of water environmental capacity.Part â…£ the evaluation and analysis of the water environmental capacity of the rivers in KaifengAfter evaluating the black-box-model made by Kaifeng environmental research design institution, the author finds out the problems existing in the study. To counter these problems, the author chooses proper evaluation model and makes scientific evaluation of the parameter in this study.Part â…¤ the conclusion and discussionAfter studying on the water environmental capacity, the author gets the following conclusions:First, the main factors which affect the water environmental quality are the standard of the water environment quality , the characteristics of the water, the features of the pollutants, the ways the time and special distribution of draining the pollutant, an...
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