The Study On Modeling And Simulation For Water Resources Multi-agent System Based On System Evolution Algorithm

Combined with the practice of the east route of south-to-north water transfer project (SNTP),the thesis introduces the complex adaptive system (CAS) theory into the research of waterresources system and studies the water resources complex adaptive system (WRCAS) from threeangles of philosophy, theory and technology by synthetically using the theories and methods ofcomplexity science, water resources allocation, artificial intelligence (AI) and computersimulation.Firstly, the theory, characters and concept of agent, the standpoint of adaptability leading tocomplexity and the study means of CAS are introduced. Then the technology means of WRCAS isidentified based on the analysis of water resources system according to CAS theory, and then theconcept of water resources multi-agent system (WRMAS) is advanced based on the theoryframework of WRCAS.Secondly, the modeling of WRMAS is studied, including two parts: agent modeling andsystem modeling. Agent modeling is to abstract the agents from a water resources system based onthe analysis of the water resources system and then to build the theory and structure model of theagents based on AI theory. System modeling is to build the whole model of WRMAS and mainlyconsiders how to organize and harmonize the agents to accomplish the co-evolution and wholeobjects of WRMAS. For this, a system cooperative model is built by the cooperative co-evolutionmechanism is introduced.Thirdly, the evolution algorithm of WRMAS is studied and a three-level-evolution-model isestablished based on genetic algorithm (GA), which realizes the transition from the conceptualmodel of agent and WRMAS to the simulation model. The three-level-evolution-model studies thesystem evolution algorithm from the three levels: micro-agent behavior level, micro-agentinteraction level and macro-system evolution level. The every level of the model is discussed indetail and illustrated with an example.Fourthly, the simulation problem of WRMAS is studied and a simulation framework is builtbased on the agent-oriented theory and technology.Finally, as a practice of WRCAS theory and methods, the water resources allocation theeast-route of SNTP is simulated. Based on the knowledge of the project, a simulation model is setup by the WRCAS theory and methods are applied. The model is programmed in computer andthe simulation results are analyzed in the end of the thesis.