| An urban agglomeration of space structure is formed by five major elements, namely, node, access roads, flow, level and networks, etc. The nodes and access roads are the material elements; and the low, level and a network of space property are the function of elements. All of the functions of the city are relying on the interaction of various city material elements, many of these material elements contact with their functional activities must always rely on space law .This paper mainly investigates the Hunan "3+5" urban agglomerations of space organizations which based on these five elements respectively. The basic conclusions are as follows:(1) According to the situation of Hunan "3+5" group of cities and urban economic development, we can see that it plays a crucial role in the Hunan Province. Compared with the Central Plains City Group, the Wuhan, "3+5"urban agglomeration, Hunan "3+5" group of cities have no comparative advantages in any aspects. However, there is still a large gap between Hunan "3+5" group of cities and more mature domestic urban agglomeration.(2) The study of each node within city group reveals that, among the entire city group, Changsha is the primacy, and Changsha-Zhuzhou-Xiangtan City Group is the core area. Secondary cities include Yueyang, Changde, Yiyang, Loudi and Hengyang. Meanwhile, Changsha has the closest economic tie with Zhuzhou, Yueyang, Hengyang, Loudi and Yiyang, and has the secondary closest tie with Xiangtan and Changde City.(3) According to the analysis of city groups'land transport which uses the accessibility formula, its distribution is basically consistent, specifically, with Changsha-Zhuzhou-Xiangtan as the center, and gradually reduce to periphery in the ring's pattern. Generally speaking, either the road traffic or rail traffic, the major way to improve transport accessibility and the overall level of its balance is to strengthen the construction of regional road and railway transport network whose accessibility is in a lower level.(4) The qualitative and quantitative analysis of the city node elements flow of the urban agglomeration results indicated that"3+5"urban agglomeration spatial factor concentrates and its distribution has the obvious spatial directive property in recent years. That is to say, spatial factor concentrates into the core area of Changsha-Zhuzhou-Xiangtan City Group. (5) Sequence-scale distribution is used to study the urban population distribution in a country or region. Analysis proves that the population distribution of Hunan "3+5" urban agglomeration has basically formed a "large center, small periphery" pattern and the city group has shaped a comparatively mature hierarchy.(6) The space organizations of Hunan "3+5" urban agglomerations, must focus on shaping the overall urban agglomeration advantages, promoting the city's economic competitiveness and collaboration, with central cities as the core, strengthening the attracting and radiation leading role of the centre city in urban agglomeration, at the same time, on the basis of traffic channel within cities, promoting the coordinated development in economy, society, population, resources and environment of urban agglomeration. |
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