Research On Evolution Mechanism And Construction Decision-making Of Symbiotic City

Many countries have proposed a series of new modes for urban construction, such as green city, low-carbon city, eco-city, and symbiotic city, to solve the problems of environ-mental pollution, destruction of ecological balance, and over-urbanization. Among these new modes, symbiotic city is the one, which can involve all the natural factors and social factors of urban construction and development, and cover all the new ideas and approa-ches as the solution of those urban problems. Now, the theoretical and practical research on symbiotic city is in a preliminary phase, with the lack of universally accepted concept and integrated theory, and the lack of theoretical and practical research on the general patterns and methods of its construction from the perspective of engineering management.One purpose of this research is to provide more complete theoretical basis for scientific decision-making of symbiotic city construction, and a new angle of view for theoretical research of urban construction and project management; the other purpose is to put the related theory of symbiotic city into practical operation, providing a new way based on symbiosis evaluation for urban construction decision support, testing and verifying the practical value of the way, and providing examples for policy design of constructing environment-friendly, resource-saving and harmonious city, and conceptual design of Decision Support System (DSS) for symbiotic city construction.This paper explores symbiotic city and its construction decision support theoretically from the perspective of epistemology and methodology, and researches decision support approaches of symbiotic city construction empirically based on case study at both the project level and city level. Firstly, the concept, model, evolution mechanism of symbiotic city are studied based on symbiosis theory. Secondly, the qualitative and quantitative evaluation methods of symbiotic association between urban construction and environment are proposed, applying Analytic Hierarchy Process (AHP) at the project level and System Dynamics (SD) methodology at the city level; a symbiosis evaluation indicator system for urban construction including natural, social, economic, and technical factors, and a dynamic evaluation model of symbiosis between urban construction and environment at the city level are established. Thirdly, an analysis framework for symbiotic city construction decision-making with two levels is built, and the main factors of it are analysed. Then, the design framework based on knowledge for DSS of symbiotic city construction is established, and the conceptual design of symbiotic city construction DSS is performed for a city based on this framework. Finally, symbiosis between an urban construction project and its neighbouring environment is evaluated based on AHP, and symbiosis between urban construction and inner environment of a city is evaluated based on SD, according to statistics and investigation results, so as to verify the feasibility of symbiosis evaluation methods at meso and micro level, and to provide decision support for symbiotic city construction at both the project level and city level, and some suggestions on evolution mechanism design of symbiotic city are made based on case study.