| With the continuous advancement of global integration and the rapid development of urban economy,urban agglomeration has gradually become the key to reflect the competition between countries or regions,and cities are at an important node of economic connection,playing a great role.In the late 20 th century,with the development of information technology,urban spatial structure showed a trend of network pattern development.The hindrance of geographical distance gradually weakened,and the integration of urban functional relations and network connection became the core of urban relations.The research on regional spatial structure has gradually transformed from the traditional central-place model based on the theoretical core of hierarchical scale to the open,fluid and multi-center network model."Flow" represents spatial connections,and its basic purpose is to identify spatial patterns.The "static pattern" of urban connection only be described by means of "element distribution" or "gravity model",but the analysis based on flow data can judge the connection between cities more intuitively and scientifically,and better reflect the essence of urban space.Based on the above background,this paper applies the traffic flow,economic flow,information flow and composite flow of 11 cities in Harbin and Changchun urban agglomeration to reflect the degree of urban correlation,and constructs the correlation intensity model based on traffic flow,economic flow,information flow and composite flow.Using clustering and dominant flow analysis methods,this paper quantitatively divides the city levels from the perspective of composite flow,analyzes the correlation characteristics of the urban network pattern at different city levels,and analyzes the urban network structure based on the flow perspective.Factor analysis method is adopted to analyze the influencing factors of urban association intensity of Harbin and Changchun urban agglomeration based on composite flow intensity,analyze the restricting factors of urban network development of Harbin and Changchun urban agglomeration,put forward corresponding optimization strategies,and provide new countermeasures for regional integration development of Harbin and Changchun urban agglomeration.The main conclusions are as follows:Firstly,based on the perspective of flow space,the spatial structure of Harbin and Changchun urban agglomeration presents the spatial characteristics of "point-axis" structure.（1）Urban agglomeration plays a significant role in core city identification,but the spatial network pattern varies significantly based on different flow perspectives.The spatial network pattern based on traffic flow and economic flow shows "core-edge" structure with prominent axis characteristics,while the spatial network pattern based on information flow shows complex network characteristics.（2）The network pattern based on traffic flow and economic flow shows a trend of polarization,with strong axial characteristics and significant non-equilibrium spatial pattern.（3）From the perspective of information flow,the spatial network pattern shows the characteristics of complex network structure with core cities as the dominant and surrounding cities as the main nodes.（4）The spatial pattern of composite flows in the Harbin and Changchun urban agglomeration has a certain network characteristics,but the network structure is not perfect,the "core-edge" structure is obvious,the core part of the overall "Z" shaped structure,and the influence of traffic flow and economic flow is the most significant.Secondly,from the perspective of city hierarchy system,this paper reveals the characteristics of city hierarchy based on the comprehensive connection strength of Harbin and Changchun city agglomerations.（1）Harbin and Changchun urban agglomerations show a development trend of "dual core competition balance",and the overall distribution of city level is "2+4+4+1",and the correlation intensity gap of each level is significant.Lower-level cities are mostly located at the edge of urban agglomerations,so the traditional spatial distance still affects the degree of urban correlation under the "flow space".（2）The intensity of spatial correlation varies greatly among different city levels,showing obvious spatial dependence.（3）From the perspective of traffic flow,economic flow and information flow alone,the urban connection shows a backbone axis spatial pattern,but the composite flow intensity under the action of the three flows shows a network spatial pattern,so the single first-class can not explain the characteristics of the network spatial pattern of urban agglomerations.（4）The comprehensive development level of Harbin and Changchun urban agglomerations has declined,and the hindrance effect of administrative barriers is significant.Finally,factor analysis used to explore the influencing mechanism of network structure of Harbin and Changchun urban agglomeration.The following characteristics are obtained.（1）Under the policy of northeast old industry revitalization,industry has become the decisive factor of urban association intensity of Harbin and Changchun urban agglomeration.（2）The development of urban network pattern has shown a new trend,the phenomenon of distance attenuation gradually weakened.Based on the analysis,the following suggestions are put forward: strengthen the "Ha-Chang" development axis,expand the radiating urban area.Optimize the spatial structure of urban agglomerations and promote dual-center development pattern.To weaken the inter-provincial constraints,strengthen the inter-provincial correlation of cities,and improve the comprehensive capacity of urban agglomerations.Develop industries with distinctive local strengths and improve and upgrade the industrial structure. |
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