地理与地理信息科学

2022, v.38(01) 94-102

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基于信息流的长三角城市群中心性及影响因子研究
Research on Centrality and Influencing Factors of the Yangtze River Delta Urban Agglomeration Based on Information Flow

汤恒;许捍卫;汪成昊;
TANG Heng;XU Han-wei;WANG Cheng-hao;College of Hydrology and Water Resources,Hohai University;

摘要(Abstract):

信息流作为流空间的一种重要表现形式,为城市群网络研究提供了新视角。但目前利用信息流对城市群的研究多侧重于描述城市间的层级关系或网络结构的外部特征,对网络结构及其时空演变规律缺乏从点到面的系统分析,且较少考虑距离因素。该文提出假设:信息流会在远距离影响城市间的交互,据此利用2011年、2015年、2019年信息流研究长三角城市群地理中心性随距离的变化情况,并对城市间关联的影响机制进行分析。研究表明,长三角城市群网络的主体结构由以上海为核心向四周辐射的格局转换为以上海、苏州、南京、杭州4个城市构成的多核心结构;城市群内部各城市发展呈现由东向西递减趋势,短距离尺度上,距离增长导致城市间交互强度逐渐减弱,长距离尺度上,城市属性成为城市间交互的主导因素;选取的影响因子与信息流的相关性日益增长,其中距离因子与信息流强度呈负相关,表明流空间一定程度上减弱了距离因素对城市间关联强度的影响。
As a new form of spatial expression, the space of flow provides a new perspective for studying urban agglomerations.Information flow, as an important form of space of flow, has transformed the original relationship of urban agglomerations.However, most of the current studies on urban agglomerations using information flow focus on describing the hierarchical relationship between cities or the external characteristics of network structure, lack of systematic analysis of the network structure from "point" to "plane".In addition, most of the analysis methods do not consider the factor of distance.Therefore, this paper explores a new way of using information flow to study the change of geographic centrality with distance, and to analyze the influencing mechanism of urban connections in the Yangtze River Delta Urban Agglomeration.This approach is mainly based on the assumption: the information flow affects the interaction between cities over a long distance.The study shows that the main network structure of the Yangtze River Delta Urban Agglomeration has changed from the pattern of taking Shanghai as the core to radiating around to a multi-core structure composed of four cities: Shanghai, Suzhou, Nanjing and Hangzhou, and the development of cities in the Yangtze River Delta Urban Agglomeration shows a downward tendency from east to west.The change of distance will have a certain influence on the relationship between cities in flow space.On the scale of short-distance, the increase of distance leads to gradual weakening of the interaction intensity between cities, while on the scale of long-distance, the urban attributes become the dominant factors.The correlation between the selected influencing factors and information flow shows an increasing trend with the growth of years, in which the distance factor is negatively correlated with the intensity of information flow, indicating that the flow space weakens the influence of distance factor on urban connection intensity to a certain extent.

关键词(KeyWords): 信息流;城市关系;网络结构;中心性;长三角;引力模型
information flow;urban connections;network structure;centrality;the Yangtze River Delta;gravity model

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41771478)

作者(Authors): 汤恒;许捍卫;汪成昊;
TANG Heng;XU Han-wei;WANG Cheng-hao;College of Hydrology and Water Resources,Hohai University;

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