基于航空货运网络结构的城市层级分析

Analysis on Hierarchical Structure of Cities Based on Air Cargo Network

航空货运网络是影响城市层级结构的重要因素之一,对其进行量化分析具有十分重要的理论和现实意义。根据2002—2008年中国航空货运数据库构建的中国航空货运网络,运用复杂网络分析的测度方法,以城市航空货运量比例为依据,将中国航空货运网络分成初始层级网络、中级层级网络和核心层级网络3个层次。基于航空货运网络视角,将中国通航城市分成核心、中级和边缘城市3类层级。通过对平均路径长度、聚类系数、度分布、密度等网络特征的分析,证明了3个层级城市所在的网络都具有小世界和无标度特性,研究表明中国城市层级结构具有金字塔特性,分布严重不均匀,值得关注。

Air cargo network is an important factor of the hierarchical structure of the city,which quantitized analysis is of great significance.The Chinese air cargo network based on the database of Chinese air cargo from 2002 to 2008,by the complex network analysis methods,the paper divide China′s air cargo network into initial network,intermediate network and core network based on the proportion of urban freight.Divide the Chinese urban hierarchy into core,intermediate,and marginal city by the air cargo network view.By the geometry analysis of average path length,clustering coefficient,degree distribution,density,the paper proves that three-level network has small world and scale-free property.Studies show that the hierarchical structure of Chinese cities has the pyramid and severely uneven distribution of characteristics,to be concerned.