城市群体结构及其演进

城市群形成和发展的本质过程和直观表现是城市群体结构或城市群形态结构产生、发展到成熟完善的过程。文章从城市群体结构的概念入手,研究了其基本型式和结构划分的思路,概括了四圈层空间结构模式,即核心首位城市带、城市组群发育带、城市个体分布带、城市群腹地带。分析了其结节性与均质性、网络性、功能性的特征,并对城市群体结构发展动力、阶段及特征加以理论概括。以城市群演化为基点,对城市群体形态结构、类型和演化规律予以阐述,归纳出城市群体结构和城市群形态类型演化的相关模式。

STRUCTURE OF URBAN AGGLOMERATION AND ITS EVOLUTION

This paper has summarized the spatial model with four layers starting with the concept of structure of urban agglomeration. The authors have put forward clue about structure division and calculated degree of homogeneity in Wuxi city, analyzed its features of nub, uniformity, network and functionality,. This paper expresses the basic idea that driving force of urban agglomeration evolution is the interaction between human activity and industries (including primary industry, secondary industry and tertiary industry)as well as spatial reg ions. Evolution of urban agglomeration structure can be divided into four phases:aggregation phase (cities), aggregation and diffusion phase (urban area), diffusion and aggregation phase (urban group)and diffusion phase (urban agglomeration), which correspond respectively to the first, second, third and fourth layer.Evolution of urban agglomeration structure follow the laws of city grow th and regional economic development, and industry evolve by the order of primary industry, secondary industry, tertiary industry; secondary industry, primary industry, tertiary industry;tertiary industry, secondary industry, primary industry; land type transfer from agricultural land to non-agricultural land; quantity of layer increase gradually; function structure change from overall comprehension, overall differentiation, partial differentiation, partial comprehension to overall comprehension. Configuration of urban agglomeration consists of three basic facto rs, which are ex tending axis, node and nub area, as well as contour line. Grow th configuration includes correspondingly ball shape, belt shape and star shape. Aggregation and diffusion formed by seasonal evolution of economic development in space. Improvement of living condition, ecological trend of economy and society become main cause about expansion of urban agglomeration and change of configuration.They have a close correlation between development axis and urban configuration, between structure of urban agglomeration and configuration type. Adjusting for the structure of urban agglomeration and intensifying for city function will bring about scale change and redistribution in urban space, configuration subrogation of urban agglomeration, which make configuration of urban agglomeration in different levels in constant development and cycle. Spatial structure and functional structure will change when configuration type of urban agglomeration have a change. As a result, a theoretical recapitulation for dynamical, stages and features on the structure of urban agglomeration has been made.