Study On Interaction Between Urbanized Area Spatial Expansion And Transportation Carrying Capacity System

The urbanized area sprawl morphology expansion has been paid great attention both at home and abroad since it came into being in late20th century. For the differences between subjects and value orientation, it was difficult to get a systematic conclusion. Through all these research, it was suggested that with the changes of spatial morphology of cities or urbanized area, transportation system was complicatedly associated with land use, and was essential to the whole course of urbanized area’s spatial morphology. Based on explanation of related theories of urban sprawl, one factor-transportation carrying capacity system-was used to discuss the interaction between it and spatial morphology, in order to provide theoretical and methodological support for urban spatial structure adjustment, routing choice in the development of transportation system and bettering of the procedure of system scheming.First, fundamental definition of subjects investigated was distinguished in order to analyze advanced research in concept, origin and treatment, at the same time, relevant research of transportation carrying capacity system was described and estimated to penetrate the key points of the research. Second, from the historical angel of urban planning, causes and developmental stages of urbanized area spatial morphology in the problem of urban sprawl were introduced to study the basic pattern, developmental features and measuring methods, suggesting that transportation infrastructure played a key role in urban sprawl mode. Third, transportation carrying capacity system was under discussion in detail, including basic definitions of the system, objects for carrying, main features and function, and at last, the frame for indexing factors of the system, suggesting that utilization of transportation carrying capacity system mainly lies in accessibility and mobility. Fourth, basic mode of the interaction was analyzed to suggest its controlling, restricting, guiding and separating effect on urbanized area spatial morphology and the reaction of its evolution on the structure, efficiency, spatial distribution and carrying capacity of transportation carrying capacity system. Fifth, representation modes of this interaction were set up, Logistic model was used to illustrate the analytical framework, and then, instances were selected to describe the utility of accessibility model. Last, after citing China’s reality, rational spatial morphology was introduced, holding that strategies like compact developmental concept, TOD-oriented land use pattern can effectively control the chaotic expansion of urbanized area, and put forward a series of routing choice for optimization of transportation carrying capacity system, including realizing integration of land use planning and transportation planning, unification of mobility and accessibility, synchronization of infrastructure and transportation services programming.Creative works used can be generalized as:(1)Introducing basic definitions of transportation carrying capacity from the respective of mechanism of action, building up systematic architecture of transportation carrying capacity, analyzing the features of objects and hierarchy of constraints and giving the indexing frame of all elements;(2)Giving the idea that mobility and accessibility were main exhibitions of transportation carrying capacity system, and then analyzing the mechanism of interaction between transportation carrying capacity system and spatial morphology;(3)Setting up representation model for transportation carrying capacity system and urbanized area sprawl morphology, independent development model, and interaction model for quantitative analysis.