基于SNA的新型城镇化背景下长三角城市群协调发展水平测度

新型城镇化是长三角一体化高质量发展的重要组成部分,考虑新型城镇化水平的影响因素,构建人口?经济?生态?地理的改进引力模型,运用社会网络分析（Social Network Analysis, SNA）方法从网络密度、中心度、核心与边缘、凝聚子群以及高铁因素等方面探讨长三角城市群空间协调发展水平. 结果表明:1）长三角城市群新型城镇化空间关联网络,网络密度较低,上海和苏州的节点中心度最高,上海、杭州等8城市出入度的差值为正值,其城镇化发展对长三角其他城市有明显的空间溢出效应;2）以上海为核心城市,南京、苏州等为重要中介城市,总体呈现由内到外的圈层结构,发展联系度由核心向边缘城市圈层递减,上海、苏州、杭州等8个城市为核心子群,形成“全国经济中心+重要节点城市+强关联省会”城市组合;3）高铁因素对长三角城市群新型城镇化空间关联性影响显著,高铁通达性可促进城镇化区域协调发展. 基于分析,提出核心城市发挥辐射带动作用促进边缘城市发展,突破区域行政划分,完善都市圈布局,从人口、经济、生态等方面协调并进提升新型城镇化水平;优化提高长三角高铁网络密度,通过资源流通促进长三角新型城镇化一体化发展的结论建议.

Measurement of coordinated development level of Yangtze River Delta urban agglomeration under background of new urbanization based on SNA

New urbanization is an important part of the integrated and high-quality development of the Yangtze River Delta. Considering the factors affecting the level of new urbanization, an improved gravity model of population-economy-ecology-geography and social network analysis (SNA) method was used to explore the spatial coordinated development level of the Yangtze River Delta urban agglomeration from aspects of network density, centrality, core and periphery, cohesive subgroups and factors of high-speed rail. The results show that: 1) The spatial correlation network of new urbanization in the Yangtze River Delta urban agglomeration is relatively low, and Shanghai and Suzhou have the highest degree of nodal centrality. The difference of the ingress and egress of 8 cities including Shanghai and Hangzhou is positive, andits urbanization development has obvious spatial spillover effects on other cities in the Yangtze River Delta. 2) With Shanghai as the core city, Nanjing and Suzhou as important intermediary cities, the overall structure is from the inside to the outside and the degree of development connection decreases from the core to the peripheral city circle. 8 cities including Shanghai, Suzhou, Hangzhou as the core subgroup, it forms a city combination of "National Economic Center + Important Node Cities + Strongly Associated Provincial Capitals". 3) The high-speed rail factor has a significant impact on the spatial relevance of the new urbanization in the Yangtze River Delta urban agglomeration and the accessibility of the high-speed rail can promote the coordinated development of urbanization regions. Based on the analysis, it is proposed that core cities should play a radiating driving role to promote the development of peripheral cities, break through regional administrative divisions, improve the layout of the metropolitan area, coordinate and improve the level of new urbanization from the aspects of population, economy, ecology and other aspects. To optimize and increase the density of the high-speed rail network in the Yangtze River Delta and promote the integrated development of new urbanization in the Yangtze River Delta through resource circulation.