西部陆海新通道城市网络结构特性及其韧性研究

Structural characteristics and resilience of city network in the new Western Land-Sea Corridor

基于西部陆海新通道城市关联网络,运用城市中心性、城市关联强度和平均路径等指标,对不同等级城市网络结构及其特征进行分析,并运用中断模型对网络韧性进行深度分析.研究结果表明:西部陆海新通道主要形成"一主多副"的城市网络空间格局;随着城市关联网络等级的降低,其结构从以成都为中心的单极吸引型向以成渝城市群为中心、相应省会城市为多个副中心的空间格局转变,同时呈现出择优连接,其副中心城市呈现出较强的辐射能力;就网络韧性方面,基于节点度值的破坏策略对网络性能破坏程度最大;居民生活水平、城市发展潜力以及劳动力成本与资源优势3个主成分对西部陆海新通道城市网络格局均存在一定影响.据此提出"增长极""轴线"以及"片区"发展模式,并重点保护相应城市节点,提高西部陆海新通道整体网络韧性.

The parameters of city association network in New Western Land-Sea Corridor,such as urban centricity,strength of city association,average path and network coefficient,were used to analyze city network structure and characteristics,and interrupt model was used for in-depth analysis of network resilience.The corridor presents a pattern of Chengdu-Chongqing metropolitan area as the main center with provincial capitals as sub-centers.Decreased level of city network changed the urban network from unipolar attraction centered on Chengdu to ChengduChongqing metropolitan area.Corresponding provincial capitals were transformed into multiple sub-centers.This network presents a preferential connection,and its sub-central city presents a strong radiation capacity.Failure strategy based on node degree value should have the greatest damage to network performance.Resident living standard,urban development potential and labor cost and resource advantage all have some influence on network pattern.Development modes of“growth pole”,“axis”and“area”are hereby proposed,corresponding urban nodes should be protected in particular to improve overall network resilience.