Research On The Urban Network Structure Of The Central Plains Urban Agglomeration Based On Baidu Information Flow

With the acceleration of urbanization and the rapid development of informatization,urban agglomeration has become the most active and potential hub area in China's economic development pattern,and the study of urban network within urban agglomeration has become a hot issue in regional research.Urban agglomeration brings about a highly integrated urban agglomeration in the advanced stage of national industrialization and urbanization.The formation and development of urban agglomeration is a long natural process from competition to integration among cities,which follows the law of natural development.China is in a new stage of the transformation and development of new urbanization,and the achievements of urbanization in China are remarkable.Under the concept of comprehensive and coordinated development,China's urbanization process is about to break away from the mid-term development stage of urbanization and then enter the late stage of urbanization development,from rapid urbanization to slow development,focusing on improving the quality of urbanization.Understanding clearly the current situation and development trend of urbanization in China,conforming to the general law of urbanization development,and promoting and supporting the construction of urban agglomerations in China,on the one hand,provide internal impetus for the healthy and coordinated development of urban agglomerations in China,on the other hand,provide a reference model for the development and construction of urban agglomerations in other countries in the world.Located in the central part of China,the Central Plains Urban Agglomeration connects the developed eastern region with the vast hinterland of the western region.It has a dense population and a wide range of airlines,railways and highways.It is the link that undertakes the industrial transfer in the eastern part and the export of resources in the western part of China.It is also the highland and pioneer that drives the rise of the central region and is developing into the core growth pole that drives the development of the central and western regions of China.This paper chooses 30 cities of Central Plains urban agglomeration as the research object,and obtains Baidu index of three time sections in 2011,2014 and 2017 by using Internet website,establishes Baidu index matrix of Central Plains urban agglomeration in 2011,2014 and 2017 respectively,and accurately calculates the total amount of Baidu index information flow,relative intensity of information flow,degree of centrality and other data indicators of Baidu index of each city of Central Plains urban agglomeration.From the perspective of flow space,this paper uses social network analysis method to analyze the dynamic network characteristics of the Central Plains urban agglomeration in three time sections,constructs multiple linear regression equation by screening explanatory variables,and explores the influencing factors of the urban network of the Central Plains urban agglomeration,and draws the following conclusions:(1)By observing and comparing the two pairs of information flow linkages within the Central Plains urban agglomeration in 2011,2014 and 2017,it is found that the information linkages in the Central Plains urban agglomeration gradually change from the low-polarized linkages to the high-polarized linkages.It can be seen that in recent years,with the advancement of information technology,the urban network of the Central Plains Urban Agglomeration has been growing steadily.By analyzing the dynamic change characteristics of the total amount of information flow and the degree of centrality of each city in the Central Plains Urban Agglomeration,it is found that the total amount of information flow and the degree of centrality of the Central Plains Urban Agglomeration are increasing steadily and substantially,which indicates that the information links between cities within the urban agglomeration are becoming more intensive and the urban network is becoming more complex,reflecting the overall trend of economic and social development in the region to a certain extent.(2)The natural fracture method is applied to divide the network hierarchy,and it is found that the network hierarchy of the Central Plains urban agglomeration has gradually evolved from pyramid type to spindle type.From "1+1+5+10+12" distribution model in 2011 to "1+1+3+13+11" distribution model in 2014,The "1+1+3+13+11" distribution pattern has presented the layout pattern of "1+2+13+9+6" in 2017.The second and third levels have been significantly expanded,and the fourth and fifth levels have contracted significantly,which shows that the communication between cities is becoming closer and closer,and the urban network has gradually developed from loose to close.The trend of urban agglomeration as a whole is becoming more and more obvious.Higher frequency of contacts and more advanced means of contacts make the coverage of urban agglomeration network expanding,the number of urban nodes increasing,and the energy owned and distributed by nodes becoming stronger.(3)By using social network analysis(SNA),the skeleton network and backbone network of the Central Plains urban agglomeration with three time sections are obtained.The dynamic changes of the urban network structure of the Central Plains urban agglomeration in the three time sections are analyzed.It is found that the urban network of the Central Plains urban agglomeration has the structure of "single core,multi-node,radial axis development".The core position of Zhengzhou city network is becoming more and more prominent.Luoyang,Shangqiu,Nanyang,Anyang-Handan,Xinyang,Zhoukou-Fuyang,Puyang-Liaocheng and other cities(city groups)have become important nodes in the information network framework of the Central Plains urban agglomeration.The north-south direction of the Central Plains urban agglomeration is the Beijing-Guangzhou line,the east-west direction is the Longhai line,and the northeast-southwest direction is the Zhengji and Zhengwan lines.It can be seen that with the development and progress of new high-speed transportation and communication modes,the limitation of spatial distance is gradually eliminated.The node attribute of city in the theory of "flow space" is more and more obvious.The size of city capacity is determined by the importance of nodes in urban network.(4)Through multiple linear regression equation,it is found that the urban network of Central Plains urban agglomeration is mainly affected by three factors: GDP,built-up area of municipal districts and the number of permanent residents at the end of the year.Under the combined effect of many factors,the effect of GDP is greater than that of built-up area of municipal districts,and the effect of built-up area of municipal districts is greater than that of permanent residents at the end of the year.In addition,the status of administrative divisions,the special events occurring in urban areas,and the historical and cultural connotations,which can not be quantified,also play a certain role in the urban network.