| Summary: | 博士 === 國立臺北大學 === 都市計劃研究所 === 96 === With many megalopolises around the world have all grown from small settlements, the urbanization and urban sprawling process continues to expand the scale of a megalopolis, as seen in New York, Shanghai and Taipei. Urban development and urban economic theories, such as Cellular Automata and Rent Function, have not truly responded to the center place theory’s multi-centric spatial structure. The dynamic spatial structure modeling for multi-centric city (DSSM) constitutes the urban interactive sectors using the system theory, sets up the utility function and production function of urban sectors, and creates the criteria of general and threshold neighborhood modeling. This study conducts different simulations to understand the effect for urban centers of hierarchical system, Turbo-Cornutus, and the allocation of roadway systems and infrastructure.
The model simulations were initially on a free plain without road framework, which is used to establish the simulation framework. Next is a simulation with roadway systems, which includes right angular and non-right angular roadway systems. And what follows is s simulation with infrastructure allocating, which is to study how urban center development is impacted by the frequency using infrastructure. In actual case analyses, case one concern with a preliminary simulation on the development of the County Administrative Center Area in Yilan City, which studies the state of user distribution during the initial stage of a new community; case two pertains to a historical development simulation on Yilan City’s cultural center area, which is tested to validate how the DSSM in low-density residential areas. The study found: the reduced cost of family non-employment travel trips to urban centers have contributed as one of the crucial reasons of shaping a megalopolis; the geometry phenomenon formed by the iso-rentline has spawned the emergence and transfer of centers on a higher level of hierarchy system; the plentiful of opportunities and an avocado-shaped periphery that is larger than most ordinary periphery have created a greater tendency for centers on a higher hierarchy to take shape along the major roadways; the state of roadway impedance affects the scale of urban centers and periphery; the proximity of infrastructure is best not to allocate such facilities too close to the center to affect the center’s scale; three types of Turbo-Cornutus are encirclement, reversal and leaping; lastly, the DSSM modeling has tested useful applications on the actual case studies.
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