“流空间”视角下的城市空间网络结构研究——以成渝双城经济圈为例

推动区域协调发展已经成为构建高质量发展国土空间布局的客观需要和解决发展不平衡问题的内在需求，以城市群为核心的经济圈建设成为驱动高质量发展的重要空间层级。为实现成渝双城经济圈的区域一体化及区域多层级协调发展，将流动的生产资源与城市空间结构相结合，基于人流、信息流、技术流、经济流四大流动资源，采用社会网络分析方法，分别从点、线、面3个维度对成渝双城经济圈空间网络结构特征进行分析。研究表明：经济圈内部呈现以成都、重庆为双核心的结构，区域间相互作用，城市中心性整体表现出内部优于外部的空间特征，核心城市对外围城市未充分发挥带动作用；圈内城市链接多表现出高度不对称性，链接对称地区主要集中在成渝中轴地区，城市间的联系有待加强，经济圈外围城市与外界联系较少；区域内部小团体现象明显，团体间联系密度存在差异，整体来看城市集群格局尚未形成，跨省域、跨地区的联系不够，成渝双城经济圈主要是西侧地区围绕成都发展。最后，为构建成渝经济圈一体化及区域多层级协调发展的空间格局，建议突破行政区域限制，构建多领域的跨区域共享协作通道；加强中部地区发展动力，提高外围城市的资源吸收能力；注重经济圈内城市交通建设及信息融合发展，突出核心城市的引领作用和外溢属性，促进城市间技术交流与经济融合。

URBAN SPATIAL NETWORK STRUCTURE FROM PERSPECTIVE OF “FLOW SPACE” IN CHENGDU-CHONGQING (CHENG-YU) DUAL CITY ECONOMIC CIRCLE

Regional coordinated development has become an internal need to establish a high-quality land spatial planning and to resolve imbalanced issues with urban clusters as the core economic circle. To realize regional integration of Cheng-Yu dual city economic circle and multiple-hierarchy coordinated development, this paper combines the four circulating productive resources, population flow, information flow, technical flow and economic flow, with urban spatial structure, and applies social network analysis method to analyze the spatial network structure of Cheng-Yu dual city economic circle from points, lines and planes. Inside the circle, Chengdu and Chongqing are two dual cores. Regional interaction shows a better internal urban centrality. Core cities' do not exert their radiation role on their vicinity. High asymmetry exists inside the city linkage of economic circle, with the exception of Cheng-Yu axis having a symmetrical linkage, leaving urban connection to be improved. Outskirt cities of economic circle have a weak connection with outside. There is locally clustering with variable connection within the region. The global city clustering pattern has not yet formed, with no enough trans-provincial or trans regional connection. West of Cheng-Yu dual city economic circle is along Chengdu as the major developing center. In order to construct an integrated Cheng-Yu dual city economic circle and a multiple-hierarchy coordinated development pattern, this paper presents suggestions on setting up a shared trans regional cooperation, intensifying the central developing drives, increasing the absorbing resources capacity of outskirt cities, focusing on the transportation construction and information integration inside the circle, boosting the leading roles of core cities, and promoting technical exchanges and economic integration among cities.