Research On The Characteristics Of China's Urban Network Structure And Its Impact On Economic Development From The Perspective Of Multiple Streams

With the rapid development of information technology and transportation system,along with the transformation of production organization mode and the deepening of industrial division of labor,the spatial organization model of the urban system has undergone profound changes,the inter-city network connectivity has gradually increased,while the geographical proximity has been weakened and the regional spatial relationship There has been a network shift.The mobile and open urban network system has promoted the spatial transformation of the agglomeration economy.The functional connection between cities gradually surpasses the spatial constraints and distance attenuation of economic agglomeration,and urban networks have become an important way to achieve economic externalities.Deeply digging into the structural characteristics,linkage mechanisms and impacts of urban economic development on China's urban network from multiple perspectives and multiple scales can further deepen the understanding of China's urban network system and promote existing urban areas,urban functions and urban development policies Organic integration.Based on the above background,this paper takes 289 prefecture-level cities in the country as research areas to construct inter-city traffic flow network,information flow network and economic flow network.The methods of statistical analysis,network analysis,spatial analysis and visual expression are comprehensively used to analyze and compare the structural characteristics of the three types of urban networks,and the relationship between the three types of urban networks is explored from the two levels of relationship and node.Finally,from the perspective of multi-dimensional urban functions and multi-scale network connectivity,explore the internal connection between urban networks and urban economic development,and analyze the adjustment effect of urban size on the externality of urban networks.The main conclusions are as follows:(1)In the macroscopic pattern,the traffic flow network presents an obvious "three vertical and three horizontal" axial belt distribution characteristics,reflecting the dependence of intercity traffic passenger flow on the traffic artery;the information flow network has a distinct layer distribution and core-periphery Characteristics,basically forming the core structure of the "diamond structure" and the distribution characteristics of multiple levels of nested connections;the economic flow network shows significant polarization effects and neighbor effects,and high-level economic flow is mainly limited to the three major urban agglomerations.In terms of urban network centrality,the three types of urban networks all exhibit core agglomeration and long-tail distribution characteristics,of which the economic flow network has the most significant head effect.At the current stage,the three types of urban networks are between random networks and scale-free networks,and information flow networks have the characteristics of small worlds.(2)There is a significant positive correlation between the three types of urban network connections and the three types of urban network centrality,the strongest correlation between the information flow network and the economic flow network,and the correlation between the economic flow network and the traffic flow network Second,the correlation between the information flow network and the traffic flow network is the weakest.There is a certain linkage relationship between different types of city networks.In general,there is a mutual positive driving mechanism between the information flow network and the traffic flow network,and between the information flow network and the economic flow network.North,Shanghai,Guangzhou and Shenzhen constitute the national center of a multi-city network,and the regional center serves as a secondary node to connect and support a multi-level,multi-dimensional urban network system.A small number of cities can also gain higher online attention through their comparative advantages.(3)In general,the current urban network agglomeration shows a clear positive drive for urban economic development,but its mechanism of action has certain scale and heterogeneity.In addition,the size of the city has a certain regulatory effect on the externality of the urban network.Small and medium-sized cities mainly obtain manufacturing agglomeration income from urban networks,while major cities in large cities obtain agglomeration income from service industries,especially producer services.In particular,there is a certain negative externality in the development of the service industry in small cities,and its development is susceptible to siphoning and squeezing from high-level cities,resulting in agglomeration shadows...