Research On Characteristics And Spatial Pattern Of Population Flow Network In Chongqing County

The study on the relationship between population mobility and spatial pattern is of great significance to the Urbanization,urban system planning and industrial restructuring.Frequent population flow between cities and towns links the inflow and outflow areas to form a population flow network.The characterization of the characteristics of population flow network is conducive to a more in-depth study of the relationship and spatial pattern of population flow.In recent years,China's population migration has shifted from the southeast coast to the central and Western regions,and from the inter-provincial scale to the intra-provincial and county scale.Chongqing,as the only municipality directly under the Central Government in the western region of China,has a fast urbanization speed and frequent population flow.The spatial pattern of population flow in each county in Chongqing is quite different.For this reason,starting from the current situation of population flow in Chongqing counties,this paper condenses the basic scientific problems of the study on the characteristics and spatial pattern of population flow network in Chongqing counties,establishes a complex network model of population flow in counties,establishes a technical route for evaluating the characteristics of population flow network in counties,analyses the overall,local and node characteristics of population flow network in counties,and puts forward Spatial pattern planning strategy based on the characteristics of population flow network in counties.1)Select the research sample and construct the county population flow network model.Based on the analysis of the current pattern of population flow in 29 counties of Chongqing,this paper chooses Wushan,Wanzhou and Changshou as research samples.There are different characteristics of population flow in the whole county,local area and individual level of township in the study sample.At the overall level,there are obvious differences in the scale of population flow in counties,and a large number of people gather in urban areas;at the local level,the net population inflow into towns and townships is surrounded by the net population outflow townships in space;at the individual level,the population scale of some townships and townships does not match the size structure of the urban system.Based on the above characteristics,the townships(central urban area)in the sample counties are taken as the "nodes" of the network,and the direction and size of population flow between townships(central urban area)are taken as the "connections" of the network,and build a complex network model.2)Establish the evaluation index system of county population flow network characteristics.This paper describes the characteristics of county population flow network from the overall,local and node levels.The main conclusions are as follows: on the whole,Wanzhou and Changshou Population Flow Networks have the characteristics of small world and strong overall connection.The population flow networks in the three counties have the characteristics of preferential connectivity and strong trend of population gathering to urban areas;on the local level,the population flow network of each county has formed groups of different sizes;on the nodal level,the influence of towns(central urban areas)on population mobility is quite different and has obvious hierarchical characteristics.Most of the population of towns and townships move to some townships(central urban areas)in the region.There are overall and local differences in the influence of townships on population mobility.3)Based on the characteristics of county population flow network,this paper summarizes the spatial pattern of county population flow,and puts forward the trend judgement and planning guidelines of the spatial pattern of county population flow.The spatial visualization of county population flow network model is processed,and the spatial pattern characteristics of county population flow are summarized: In terms of overall characteristics,the spatial density of population flow network in counties is obviously different;in terms of community characteristics,population flow links show obvious near-field characteristics;in terms of node characteristics,the nodes with strong influence of population flow show a small amount of spatial agglomeration.Based on this,the spatial pattern of population flow in counties is judged as follows: the population flow network in different counties will be strengthened with the population flow,the network as a whole will be more closely linked,the size of associations will gradually become larger,and the gap between nodes will begin to narrow;In different stages,the spatial pattern of population mobility network will present the characteristics of "single-core agglomeration,point-axis flow and multi-level linkage".The spatial pattern planning guidelines based on population mobility network are as follows: Seeking a reasonable development mode of township point axis to alleviate the over-concentration of population to central urban areas;To cultivate small towns with characteristics in the floating population community as a strategic support for the near Urbanization;Promoting the networked development of population mobility and supporting the formation of a reasonable scale structure of urban system.In this paper,the characteristics and spatial pattern of population flow network in Chongqing county are analyzed.At the theoretical level,the theory of population mobility,spatial pattern theory and complex network theory are combined to study population mobility at the county level.At the methodological level,this paper explores the cross-application of the principle and method of complex network in the study of county population mobility,and establishes a technical route for evaluating the characteristics of county population mobility network.At the practical level,taking three counties in Chongqing as an example,this paper realizes the visualization expression of the characteristics and spatial pattern of the population flow network in the counties,and puts forward the planning guidelines of the population flow network and spatial pattern in the counties.Hope to provide decision-making ideas for County town system and urbanization development.