基于要素流的长三角城市群空间布局

以长三角城市群30个地级市市区为研究单元，从要素流动的动态视角，建立要素流的数理模型，借助于ArcGIS软件，对长三角城市群内城市的经济流、交通流和信息流的强度和方向进行定量分析和评价，运用赋值法对3种要素流总量进行评分，并进行空间层级划分。得出核心区（包括上海、江苏沿江八市、环杭州湾地区等地市）和辐射影响区（位于长三角两翼的地市）。基于城市间的空间联系特征和城市群的空间层级结构，对长三角城市群的空间发展布局提出进一步引导和规划，即上海为核心，苏州、南京、杭州、合肥和徐州为区域性中心城市，构成以沪宁合、沪杭、沪徐和沪温为4个发展轴的反“K”字型的空间形态，依据城市区位和要素联系特征，将城市群进一步划分为6个城市组团，形成以中心城市为增长节点、以发展轴为联结线、以城市组团为发展域的“点―线―面”有序发展的空间互动格局。

Spatial Structure of Urban Agglomeration in the Yangtze River Delta Based on the Analysis of Element Flow

With the rapid socio-economic development of Chinese urban agglomeration, researches on its spatial structure and contact have achieved abundant results. Taking 30 prefecture level cities of urban agglomeration in the Yangtze River Delta as the research units, from the dynamic perspective of element flow, establishing the mathematical models of element flows and using ArcGIS drawing software, this paper quantitatively analyzes and evaluates the intensity and direction of the economic flow, traffic flow and information flow among cities of urban agglomeration in the Yangtze River Delta. By using the assignment method to score on the intensity of three element flows, the spatial structure of urban agglomeration can be divided into two level parts: the core area (including Shanghai, eight cities along the Yangtze River in Jiangsu, and the Hangzhou Bay Rim, etc.) and the radiative zone (located in the North and the South Flanks of the Yangtze River Delta Area). Based on the spatial contact characteristics between cities and spatial hierarchy structure of urban agglomeration, this paper further proposes the spatial development layout of urban agglomeration in the Yangtze River Delta. It is considered that Shanghai would be the core city, while Suzhou, Nanjing, Hangzhou, Hefei and Xuzhou the regional central cities, constituting an anti “K” pattern connected by four development axes, namely, Shanghai-Nanjing-Hefei, Shanghai-Hangzhou, Shanghai-Xuzhou, and Shanghai-Wenzhou. According to the features of city location and elements contact, the urban agglomeration would be further divided into six city groups, and form a spatial interaction pattern of point-line-area in orderly development, the central city would serve as growth of node, the development axis as connecting line, and city group as developing area.