Evaluation of network spatial pattern and structural resilience of Chengdu-Chongqing urban agglomeration
Urban clusters are vital for regional development in China,internally characterized by a complex network of interconnected nodes.Analyzing their resilience to acute shocks and chronic pressures is crucial for the sustainable development and security of the region.This paper investigates the 16 prefecture-level cities within the Chengdu-Chongqing urban cluster as of 2020.It constructs networks of transportation,economy,information,and comprehensive connections.The network's resilience is assessed from four perspectives:hierarchy,matching,transmission,and agglomeration.Simulation analysis is used to examine the network structure's absorption and fault tolerance capabilities in a disrupted environment.Results show that the Chengdu-Chongqing urban cluster's network spatial pattern is dominated by a"dual-core",with pronounced hierarchical differences.The"dual-core"and"networked"patterns are significant in the transportation connectivity network.The economic and information connectivity networks display"bow-shaped"and"spider-web-like"patterns respectively.The comprehensive connectivity network's"networked"feature is the most pronounced.The topological structure exhibits both absolute polarization and relative equalization.Within the economic network's topology,the core area is"dual-driven",with a significant agglomeration effect in the southern cities.In the topology of the information network,node connections are diversified and tend to favor core cities.In the comprehensive network's topology,the"dual-core"main structure persists throughout,with secondary central cities having the potential but not the power to balance.The formation of topological structures results from the combined effects of multiple factors,including geographical conditions,resource distribution,economic development levels,and policy guidance.Developmental differences and collaborative actions within urban clusters cause the network structures of various fields to exhibit characteristics of both absolute polarization and relative equalization.The network's hierarchy is significantly non-homogeneous and three-dimensional.There is strong heterophily and no significant homophily clustering.The transmission efficiency is relatively high,with strong accessibility and diffusivity.Top cities show strong agglomeration,while non-core cities have unidirectional connections.The structural resilience of transportation,economy,information,and comprehensive connectivity networks is characterized by transportation network(strong hierarchy,high heterophily,weak transmission,medium agglomeration),economic network(medium hierarchy,weak heterophily,strong transmission,strong agglomeration),information network(weak hierarchy,medium heterophily,strong transmission,weak agglomeration),comprehensive connectivity network(strong hierarchy,medium heterophily,medium transmission,medium agglomeration).The Chengdu-Chongqing dual-core structure is prominent,which brings a strong radiative driving effect while also generating the risk of spatial closure.Faced with external risks and shocks,there is a certain degree of structural resilience,but there is still much room for improvement.The heterogeneity of network structure resilience stems from the unbalanced development in different fields within the Chengdu-Chongqing urban cluster,as well as the corresponding differences in diverse network structures.The structural characteristics of different networks reflect the diversity and complementarity within the urban cluster.In a disrupted environment,the order of absorption and fault tolerance capabilities is information network>economic network>comprehensive network>transportation network.Among them,the information network has the strongest structural resilience,the transportation network the weakest,with Chongqing and Chengdu being key nodes affecting absorption and fault tolerance capabilities.The decentralized and distributed characteristics of the information network enhance its resilience,facilitating better adaptation and recovery in disruption scenarios.The transportation network,involving infrastructure,is often susceptible to natural disasters and accidents,making it difficult for the network to quickly adapt and repair in the event of disruptions.The Chengdu-Chongqing urban cluster's dependency on Chengdu and Chongqing is too high,with a significant disparity in external connectivity between central and peripheral cities.The"core-periphery"effect is pronounced,making"peripheral cities"such as Ya'an,Guang'an,and Dazhou more vulnerable.
国家科技期刊平台
NSTL
万方数据
