Research On The Spatial Reconstruction Of Chinese Megalopolis In New City Times

With the continuous progress of urbanization, the city entered a new era of urban development. In this period, urban population exceeded the rural population and knowledge economy, information technology, globalization, sustainable development, smart growth became the typical signs of the development of cities. Furthermore, the spatial structure of Chinese megalopolis changed hardly, the spatial reconstruction became a prominent feature of the development of city space. Taking Jinan for an example, the spatial reconstruction of Chinese megalopolis in new city times was researched, on the basis of summarizing a large number of basic theories, anglicizing of numerous literature, and field survey, using geographic measurement methods and geographic information system tools.The impetuses of Chinese megalopolis's spatial reconstruction in the new city times were complex. There were not only natural conditions, economy development, transportation, policy planning and other traditional power, but also information technology, economic globalization, knowledge economy, sustainable development, smart growth concept and other new power. The spatial reconstruction of megalopolis was effected by these impetuses which interrelated and interacted together.Four stages that the evolution of spatial shape experienced had been summarized, which were freedom expansion, north and south bound, filling expansion, and breaking expansion. At the same time, the urban spatial structure developed from"axial symmetry"to"one city and three group"and then"one city, two areas". The structure of traffic lines, urban hierarchy, and urban function which could reflect on the urban spatial structure all presented new appearances.Three typical law of population spatial reconstruction were summarized: urban population distribution was uneven and abrupt; the population of city center changed obviously and reduced; the total urban population growth would achieve stability eventually. Two types of population spatial reconstruction of Jinan were found, they were"core growth"and"wing growth". Four typical types of economy spatial reconstruction of Jinan city were reserved from the analysis of tertiary industries and eight main economic sectors, they were the primary industry space compressed; non-agricultural industries space transformed severely the tertiary industry space integrated and promoted; the economy spatial reconstruction of urban district was dramatically. The external space was also reconstructed. Calculated the urban external spatial tensile fore and fought that the urban external spatial tensile fore of Jinan city was almost the biggest. Jinan city took up the dominant position and had unparallel advantages.A series of problems were found in analysis, such as the phenomenon of"big province, small capital"; the descendent regional center; a high degree of overlap of urban functions; the polarized development of center city; the significant differences in urban space; the intense space competition and so on. To solve these problems, some optimizations could be taken, such as optimized the center city; optimized industrial distribution; strengthen the role of government, enhance the internal construction of center city; intensive use of land to achieve urban smart growth, and build innovative city and information city.