Study On Network Structure Of Coordinated Development Of Yangtze River Delta Urban Agglomeration Based On "flow Space"

Urban agglomeration is the main form of urban development in China.In the context of China’s rapid urbanization,the spatial distance between cities has been gradually narrowed.The flow connection between physical space and virtual space in urban agglomeration occurs more frequently.The flow of multiple elements forms a diversified flow space,and the synergistic development effect between cities is gradually deepened.The spatial structure of urban agglomeration affects the formation of the relationship of coordinated development among cities,and the spatial network distribution of multi-flow is related.The spatial network distribution pattern of multiflow in urban agglomeration reflects the local resource allocation and development trend of urban agglomeration.The spatial analysis of multi-flow is helpful to grasp the development trend of urban agglomeration.Exploring the formation mechanism of urban agglomeration collaborative development relationship is of great significance to promote regional collaborative and sustainable development.From the perspective of flow space,this paper takes the cooperative development relationship of urban agglomeration and pluralistic flow space of Yangtze River Delta Urban Agglomeration(YRDUA)as the research subject,and studies the distribution characteristics of various elements of flow space of the urban agglomeration.Explore the quantitative relationship between the coordinated development of YRDUA and spatial network structure and external variables.Specifically,sustainable development goal indicators are collected to construct the coordinated development network of YRDUA.In addition,we collect the flow data of population flow,goods flow,information flow,capital flow,and traffic flow of the target urban agglomeration to form the pluralistic flow space of YRDUA.Using the social network analysis method,this paper discusses the spatial distribution mode of flow space,analyzes the current situation of different urban nodes in urban mass development,and puts forward corresponding development suggestions.The exponential random graph model(ERGM)is used to explore the formation mechanism of urban agglomeration collaborative development.This paper constructs the condition criteria for the coordinated development of urban agglomeration,simulates the changes of urban clusters.In this paper,the flow space theory and sustainable development theory are comprehensively applied to the study of the spatial structure of urban agglomeration.In addition,this paper realizes the application of ERGM to collaborative development network modeling.The main conclusions of this study are as follows:(1)The leading effect of provincial cities in the collaborative development network is obvious,forming a cohesive subgroup of collaborative development with Shanghai,Hangzhou,Nanjing,and Hefei as core nodes.The pluralistic flow shows a gradual decline from the eastern coastal industrial agglomeration area to the inland region,and the spatial distribution is uneven.High-value clusters distribute in the eastern part of the study area and low-value clusters distribute in the central and western parts of the study area.The sub-centers functions of Hefei and Ningbo should be further improved.Taking Shanghai as the core city,the advanced pluralistic flow is distributed as three strips.Nodes in the network are divided into multiple dominant distribution patterns.Shanghai is the leading city of flow space.Within the belt,Nanjing,Suzhou,Wenzhou,and Hefei,as secondary leading cities,perform the transmission roles.Shanghai plays a leading role in capital flow and logistics.Hangzhou and Hefei are the leading nodes in the information flow space.Population flow and traffic flow are mainly distributed in the border area of Anhui and Jiangsu.Population flow and traffic flow have strong aggregation and small spatial span.(2)Regression results show that traffic flow,population flow,information flow,market index matching,research and development(R&D)investment and human resource index are positively correlated with coordinated development.The proportion of fixed asset investment,capital flow,and logistics are negatively correlated with coordinated development.It is suggested to strengthen the layout of closed interaction,high-order dependence,synergy of urban agglomeration,and strengthen the talent training and R&D investment of urban agglomeration members.The government should strengthen the construction of coordinated urban systems and deepen the multidimensional linkage of flow space between cities.The government should give priority to the objective conditions of the coordinated development relationship of urban agglomeration and formulate policies to strengthen the cooperative relationship between central cities and regional marginal cities,so as to avoid the imbalance of development caused by the excessive concentration of urban agglomeration resources.