信息流视角下的成渝城市群空间组织特征及其规划探讨 — —基于百度指数的城市网络研究

在“流动空间”理论指导下，采用 “百度指数”模拟城市间以民众关注度为主 的信息流数据，并以此构建成渝城市群城市 网络模型。在模型基础上，分析成渝城市群 空间组织特征，同时对指导空间组织的《成 渝城市群发展规划（2016—2020）》进行 探讨。研究表明成渝城市群空间组织呈现： 一、高度双核集聚化；二、发展不均衡，“马 太”分级化；三、初步网络化，腹地争夺化 三点特征。在此基础上，进一步对规划中提 出的核心城市作用、双核城市关系、成渝主 轴建设、次级城市发展4个议题进行深入解 读，总结反思规划提出的“一轴两带、双核 三区”的空间格局，并为后续规划提供新的 依据与启示。

Spatial Organization of the Chengyu Urban Agglomeration and its Implications on Planning from the Perspective of Information Flow: City Network Analysis Based on Baidu Index

From the perspective of space of flow theory, this paper analyzes city networks of Chengyu urban agglomeration by examining Baidu index among cities that measure intensity of Baidu research from one city to others to simulate the information flow. The results are used to analyze the characteristics of spatial organization of Chengyu urban agglomeration, as well as to understand the Chengyu urban agglomeration development plan, which guides the spatial organization. Firstly, the research shows that Chengyu urban agglomeration holds three spatial characteristics: 1) Chengyu urban agglomeration has the highly clustered dual core spatial organization. Chongqing and Chengdu are the core cities with the second level of connection strength in the national urban information network. 2) The development of Chengyu urban agglomeration is not balanced and has the feature of Matthew classification, which means there are increasing gaps between well developed cities and developing cities. 3) Chengyu urban agglomeration has the feature of preliminary networking and hinterland competition, which means that in addition to the influence of the core cities, the other cities like Dazhou, Nanchong, Mianyang also begin to build the preliminary relations with each other. Then, based on the analysis of spatial characteristics of Chengyu urban agglomeration, this paper makes an in-depth interpretation of the four issues proposed in the Chengyu urban agglomeration development plan. The role of core cities, the relationship between core cities, the construction of Chongqing Chengdu main axis and the development of secondary cities are fully discussed from the perspective of information flow. Firstly, for the role of core cities, Chongqing and Chengdu, as two information gateway cities, have two-way functions of connecting the national network outward and radiating the regional hinterland inward. It is in line with the requirements in the plan as the leading core cities, Chongqing and Chengdu are supposed to deepen the internal and external cooperation. Therefore, for the future plan, it is clear that, at the external level, to strengthen the relationship with Yangtze River Delta, Pearl River Delta and Beijing Tianjin Hebei urban agglomeration in the cooperation of industry and transportation as well as, at the internal level, to well manage the industrial arrangement and transportation planning. Secondly, for the relationship between core cities, on the one hand, the information connection of Chongqing and Chengdu has risen to the second level of urban network in China. On the other hand, Chongqing and Chengdu compete to expand their own influence area within agglomeration. It reflects both competition and cooperation relationships between Chongqing and Chengdu. It is also in line with the statement in the planning that the competition of core cities is greater than cooperation. Therefore, the cooperation between Chongqing and Chengdu should become the key content of the follow-up planning. It is supposed to integrate the common resource advantages of the two cities, and expand the cooperation field while the competition is inevitable. Thirdly, for the construction of Chongqing Chengdu main axis, the plan points out that it is of utmost importance to build Chongqing Chengdu main axis to lead the development of other cities on the axis. However, from the data of information intensity, GDP and permanent population, cities in the central part of Chengyu urban agglomeration collapse seriously, and no other cities can attract the flow elements of Chongqing and Chengdu. Hence, the Chongqing Chengdu main axis has not been established. Finally, for the development of secondary cities, it is pointed out in the plan that it is meaningful to promote the coordinated development of large, medium and small cities, and to form a reasonable urban system. This paper uses NetDraw software to further analyze the urban network based on information flow. It is found that in 2015, the overall network of Chengyu urban agglomeration presents a single dual core structure. And in 2018, the status of Nanchong, Yibin, Mianyang and Luzhou nodes in the network has been improved, which can generate horizontal networks , such as connections between Yibin and Luzhou, Mianyang and Suining, as well as Mianyang and Dazhou, etc. Accordingly, it has initially changed the situation from a single dual core structure to a preliminary network structure. From what has been discussed above, it helps to summarize and reflect the spatial pattern of one axis, two belts, dual core, and three areas proposed in the plan for the spatial organization of Chengyu urban agglomeration and also provide discussions and implications for the subsequent planning.