Study On Evolution Of Regional Distribution System Of Water Resuorces

Emerging problems of global water resources reflect the contradictions between the objective conditions of regional water resources and local ever-changing demand of water which promote the evolution of regional distribution system of water resources. Obviously, studying the evolutional law is helpful to scientific management and sustainable use of water resources. In this paper several complex system theories were used to research the evolutional process of regional water distribution system and the driving force of system evolution was found. Then based on maximum flux principle and complex adaptive system theory the natural selection mechanism was discovered. Finally, the mechanism was proved by the case study of Tianjin.Firstly, on the basis of clearing of natural water cycle process binary coupling relations between regional water distribution system and natural water cycle process were studied. Then the water flux characters of the system were analyzed.Furthermore, the complex adaptive evolution of regional water distribution system was discussed from different angles and two important characters in evolution were found.Secondly, the essence of non-equilibrium phase transitions of regional water distribution system was obtained after system analyzing of it. Then the system flux chart at the core of aggregates was drawn and the system behavior characters were discussed. After analyzing the leading structure of system the driving force of system evolution was found, namely, water driving force and economic driving force.Thirdly, based on the maximum flux principle and complex adaptive system theory the evolution potential function of regional distribution system of water resources was constructed, so the prerequisites of non-equilibrium phase transitions of system were deduced. According to the actual situations of regional water distribution system the new sequence parameters of system evolution was constructed in a creative way by using complex adaptive system theory which could characterize the system structure. Furthermore, the new evolutional dynamic function was deduced and the specific method to calculate the coefficient matrix was put forward. Finally, the natural selection mechanism of regional water distribution system was explained on basis of the new evolutional dynamic function. Finally, after the comprehensive status of Tianjin water resources and water environment were summed up comprehensive and systematically, the demand of water quality in Tianjin was discussed. Then three dynamic equations of different aggregates were presented. Applied the natural selection mechanism of regional water distribution system the four non-equilibrium phase transitions of Tianjin water distribution system were studied. By the case the mechanism was proved.