Abstract: When the transportation capacity of some nodes in urban agglomeration decreases, it will have a greater impact on the overall network than other nodes, therefore, such nodes will be considered as important nodes. It is of great significance to ensure the normal operation of urban agglomeration, maintain the normal flow within urban agglomeration, and promote the high-quality development of urban agglomeration by identifying important nodes in urban agglomeration and strengthening the protection of important cities. The urban agglomeration network model was constructed from the dual perspectives of high-speed railway flow and expressway flow, and the important node evaluation model of urban agglomeration network was constructed from the urban correlation, clustering and intermediary by drawing on the gravitational model. The Chengdu-Chongqing economic circle was taken as an example for empirical analysis. The research results show that the overall importance of each node city decreases non-linearly in the high-speed railway network model, while the overall importance of each node city decreases linearly, and the decline is relatively uniform in the expressway network model.

Key words: traffic and transportation engineering; high-speed transportation network; traffic flow; gravity model; importance analysis; Chengdu-Chongqing economic circle

摘要： 当城市群中某些节点运输能力下降时，其相较于其他节点会对整体网络产生更大的影响，则认为该类节点为重要节点，通过对城市群中重要节点进行识别，加强重要城市保护，对于保证城市群正常运作，维持城市群内部正常流动，促进城市群高质量发展有着重要意义。笔者基于高速铁路流与高速公路流双视角构建城市群网络模型，通过借鉴引力模型，从城市关联性、聚类性、中介性构建城市群网络重要节点评价模型，并以成渝地区双城经济圈为例进行实证分析。研究结果表明：在高速铁路网络模型中，各个节点城市整体重要性结果呈非线性下降；在高速公路网络模型中，整体重要性结果呈线性下降，下降较为均匀。

关键词: 交通运输工程；高速交通网；交通流；引力模型；重要度分析；成渝经济圈