Research On The Distribution And Urban Network Analysis Of Intercity Population Mobility In China

With continuous advance of economic globalization and regional integration,the rapid development of information network,transportation is greatly compress the distance of space and time between city,increased frequency of communication among the cities,the speed is accelerated,the original geographical spatial structure by a relation of network penetration and refactoring,large,medium and small cities in different spatial scales connected to form a complex network space organization,urban network.Constructing network model from the perspective of "flow space" has become a new paradigm of urban network research in recent years.Internet applications with location services can continuously and stably record the travel trajectories of their users,providing a new data source for urban network research.Relying on gold across the city travel time data,construct the relationship between the national city network and city of city population flow matrix,by time division,GIS spatial expression,index system of social network analysis and correction of gravity model of regional network spatial characteristics of deconstruction,the population of China,China's Yangtze river delta urban agglomeration flow distribution between cities,urban network structure characteristics,the contact strength problem such as analysis or evaluation of time and space,and tentatively analyzes the correlation factors driving the inter-city migration.The purpose of this study is to provide scientific decision-making reference for the adjustment of regional resource allocation,the formulation of population policy,the regional integration and cooperation and the sustainable development of urban agglomeration.The main conclusions of this paper are as follows:(1)The population flow during weekdays and rest days is relatively stable and the inflow and outflow patterns of cities are consistent.Compared with the normal period,the floating population is more active during the Spring Festival travel rush,and the migration distance increases significantly.During the Spring Festival travel rush period,the direction of population flow in the "return period" and "return period" is basically symmetrical,especially the spatial direction of large-scale migration from the central provinces to the eastern coastal areas after the Spring Festival,which makes a large population "depression" appear in the central region.(2)The floating population in China shows a spatial pattern of "east is dense and west is sparsely distributed".The floating population distribution system has the characteristics of hierarchical differentiation and presents a pyramid-like distribution structure in quantity.In the form of spatial organization,centrality and flattening trend coexist in China's urban network,which is reflected in the fact that there are fewer high-value flow and high-class cities,but a large number of floating population are concentrated,while there are more low-value flow and low-class cities,but the connection between these cities is weak and scattered.Secondly,the orientation of floating population has the dual characteristics of "neighbor" and "superior".The floating population distribution pattern is formed based on urban agglomerations,and different urban agglomerations have different but relatively fixed population input and output channels.(3)The urban network of the Yangtze River Delta has developed into a relatively mature network organization model.The internal flow momentum of Jiangsu province is larger in four periods.Compared with the other three periods,the inflow of Anhui province in the "returning period" increased,and the outflow of the "returning period" surged sharply.The inflow of Shanghai,Jiangsu and Zhejiang provinces in the "returning period" all increased to different degrees.(4)The network pattern of the spatial system of population flow in the Yangtze River Delta is roughly a "Z" shaped structure with Nanjing,Shanghai,Hangzhou and Ningbo as the supporting nodes.The Yangtze River Delta has a high degree of agglomeration among cities,a mature urban network and a high degree of regional integration.(5)Geographic distance is an important frictional resistance of population migration.The accessibility and convenience of intercity transportation are the essential material basis of population mobility.