信息流视角下长三角城市群空间组织辨析及其规划启示——基于百度指数的城市网络辨析

通过统计长三角江浙沪皖26城市彼此间互联网用户对其他城市搜索的"百度指数",模拟测度城市间以民众关注度为主的信息流强度.基于此构建"长三角"地区的城市网络模型,结合企业组织视角的城市网络对比分析其结构特征,并在分析结果的基础上,解析和探讨《长江三角洲城市群发展规划 (2016--2020)》中"一核五圈"的空间格局,得出以下规划启示:首先,相比企业组织的城市网络,信息流视角下的城市网络结构与城市行政等级结构的关联性更低;其次,城市群的外部范围、内部组织等虽有清晰的界限划定,其各城市的实际功能联系却是紧密交织并不断拓展的,将逐渐演化为动态、开放的网络体系;再次,"长三角城市群"规划范围内部发展不平衡、不充分的问题仍存在,需针对不同外围后发城市提供相应对策支持,加强其与核心城市的互动联系,从而进一步提升城市群的整体竞争力.研究提出,随着网络大数据的广泛应用,基于信息流的城市网络研究将更加全面和准确,可为宏观层面的城市区域规划提供一定的科学依据,引导城市与城市群以更加开放的思维做规划、谋发展.

Spatial Organization of the Yangtze River Delta Urban Agglomeration and Its Implications on Planning from the Perspective of Information Flow: Analysis of City Network Based on Baidu Index

The paper analyzes city networks in the Yangtze River Delta Region by examining Baidu index among 26- cities that measures intensity of Baidu search on other cities as a proxy of information flow between cities. The results are used to compare city network based on enterprise organization and understand regional spatial structure proposed by the Yangtze River Delta Urban Agglomeration Development Plan (2016-2020). Several conclusions and implications are drawn from this study. 1) Compared to the city network based on enterprise organization, the structure of city network of information flow is less impacted by urban administrative hierarchy and restricted by the administrative boundaries. 2) Despite the clear demarcation of the external scope and internal organization of the urban agglomeration, cities are intricately and functionally connected. With constant change and expansion, the region will gradually evolve into a dynamic and open network system. 3) The Yangtze River Delta urban agglomeration is an unbalanced and inadequate city-region. Specifiic policies should be designed for peripheral cities in terms of network connectivity to enhance their interaction with core cities. As a result, the overall competitiveness of the urban agglomeration can be further enhanced. With socioeconomic development, technological advancement, as well as the wider application of internet big data, the research on city network based on information flow will be more comprehensive and accurate, and can provide a good reference for macro- level planning. The cities and urban agglomeration can be planned and developed with more open thinking.