国内外典型城市群交通网络特性对比分析

Properties of traffic networks in urban agglomeration

为了研究城市群交通网络特性,运用ICN dual approach方法构建了以美国东北部大西洋沿岸城市群、日本太平洋沿岸城市群、英国伦敦为核心的城市群、长江三角城市群、京津唐城市群、珠江三角城市群等国内外典型城市群交通网络模型,使用MATLAB和VC++分别对它们的平均度、网络密度、n-聚集系数、平均最短路径、随机网络聚集系数、随机网络平均最短路径、网络结构熵、全局系数等网络特性指标进行计算和比较分析,得到以下结论:a)六个城市群交通网络都具有小世界性而不具有无标度性,一般可以推论城市群交通网络只有小世界性、不具有无标度性;b)六个城市群交通网络都存在着极少道路介数很大,对整个网络的整体性、连通性和安全性意义重大;c)六个城市群交通网络中珠江三角城市群交通网络的整体效率最高,日本太平洋沿岸城市群交通网络结构熵最小,表明其最有序。

In order to research properties of traffic network of urban agglomerations,this paper designed the model of urban agglomeration by ICN dual approach,which included the northeastern United States Atlantic coast urban agglomeration,Japan＇s Pacific coast urban agglomeration,British London urban agglomeration,Yangtze river delta urban agglomeration,Beijing-Tianjin-Tangshan urban agglomeration,Pearl river delta urban agglomeration.And figure out averaged-degree,averaged-clustering coefficient,betweenness centrality of roads with degree and structure entropy based on node betweenness centrality,global coefficient,which show：a）traffic networks have small-world behavior but no scale-free property;b）it is significant for the traffic networks of six urban agglomeration that the betweenness of a few real road is greater;c） the global coefficient of Pearl river delta urban agglomeration is greatest among six urban agglomeration and the entropy of Japan＇s Pacific coast urban agglomeration is smallest,which show it is in order.