Research On County-level City Network In Yunnan Province Based On Road And Rail Passenger Flow

With the development of globalization,cities no longer exist in independent individuals,and they need to be continuously exchanged with the outside world.In the process,the relationship between cities will be in the network space.Through the flow of various elements,such as people flow,logistics,and information flow in cities,it can reflect the degree of connection in cities in the region and shape it as a urban network space.The urban network shaped in the "flow space" can measure the city’s position in the entire area and the relationship between cities,which will affect the functional positioning and industrial layout of regional cities.In particular,the urban network under traffic flow can not only directly explain the flow of people,logistics,and information flow between cities,but also judge the status of urban nodes in the network.The structural characteristics of the urban network are used as an example of Yunnan Province.From the perspective of the county scale,the characteristics of the urban space network of Yunnan Province have an important role in promoting the balanced development of the region and the evaluation of urban status.Roads and railways are still the main ways of county connection,and the two are also further shaping the urban network form in the relationship of continuous competition and cooperation,based on which the cross-sectional data of county highway and railway passenger shifts in Yunnan Province in December 2022 are selected to obtain the passenger flow data of public railway in each county to build a city network.The node attribute characteristics and network topology pattern of county city networks under highway and railway flows were analyzed and summarized by social network analysis method,community discovery algorithm,and Arc GIS spatial analysis methods,so as to preliminarily clarify the urban network characteristics under traffic flow in Yunnan Province.Then,the traffic flow networks of the two are compounded to construct the road-railway passenger transport superimposed network,in order to have a deeper understanding of the status of county city networks under traffic flow,the comprehensive index of county city traffic under the three traffic mode flow networks is constructed through social network indicators,and the geospatial characteristics of the county traffic comprehensive index under the three networks are analyzed,and finally the influencing factors of the node status of county cities under the superimposed network are analyzed by using geographic detectors.The following conclusions are obtained(1)The difference in the node attributes of the urban network under the passenger flow of highway and railway is obvious,and the number of issues issued by countylevel cities and municipal districts is greater than the number of arrivals,indicating that it plays a role in radiation control in the transportation network,and the node strength and intermediary centrality of county-level cities and municipal districts are generally high,and they have greater power and control in the network,and are in the absolute core city network position.From the perspective of counties,Kunming City,Dali City and Chuxiong City are in the power centers of the highway passenger transport network and railway passenger transport network,while Anning City and Lufeng City have strong node advantages in the road network and railway network respectively.It can be found that the road passenger transport connection follows the distance attenuation and geospatial proximity characteristics of geography,and the railway passenger transport connection will jump and connect with the longer distance area under the effect of temporal and spatial convergence,reflecting the geographical characteristics of geographical spatial heterogeneity.(2)In terms of network topology,the radial connection flow with Kunming urban area as the high-density network is mainly formed at the level of highway passenger flow,and the main axis of connection is Dali City in the west and Wenshan City in the southeast,and the low-level is spread to the surrounding areas with the capital city of Prefecture as the main core.At the level of railway passenger flow,the main axis of connection between Qujing City and Dali City in the east-west direction is formed,and the secondary axis of Dali City-Qiubei and Guangnan County in the northwestsoutheast direction is formed.And with Kunming urban area as the center,scattering along the trunk line of the hub county railway network.The polarization phenomenon of network hierarchy is obvious,and the high level matches fewer axis city pairs.Highway associations are mostly divided on the basis of administrative boundaries,and railway passenger transport communities are relatively fragmented,showing an "X" structure.(3)In the study of the construction of superimposed network and the spatial pattern of multiple networks,it is found that the development of highway passenger transport is more biased towards counties in the central and southern regions,the center of gravity of the railway passenger transport index is greatly biased towards the southeast region,and the center of gravity of the county traffic index of the superimposed network is between the geometric center of Yunnan Province and the center of gravity of the highway passenger transport index.The spatial distribution of the railway passenger traffic index is more directional,showing a northwest-southeast inclination,which is close to the direction of the main railway lines in the province.The county traffic index of the superimposed network is more discrete and homogeneous in spatial distribution,and the merger of the two modes of transportation,road and railway passenger transport,can bring obvious effects on the balanced development of regional transportation.The comprehensive index of railway passenger traffic is more concentrated in spatial distribution,and the comprehensive index of traffic of superimposed network shows random distribution in space,indicating that there is a complementary role between highway passenger transport and railway passenger transport network,which can well weaken the polarization effect of county transportation passenger transport space.(4)From the influencing factors of the comprehensive transportation index,the total retail sales of consumer goods,the population at the end of 2021 and the general public budget expenditure are the most important factors causing the difference of the comprehensive transportation index of the superimposed network,and it is found that the interactive explanatory power of all factors has increased through interactive detection and analysis,among which the interaction between total retail sales of social consumer goods and per capita local fiscal revenue has the strongest explanatory power.From the analysis of influencing factors,it can be seen that the improvement of the transportation level of urban passenger transport network requires increasing basic investment,improving urban service level,breaking the connection barriers between county cities,and promoting interactive exchanges.Secondly,we should continue to build regional integrated development,coordinate resource allocation,promote the transformation and development of the county economy,enhance market vitality,accelerate the circulation of various factors,effectively integrate the county city system and transportation network,and improve the integrated and balanced development.