河谷型城市公交网络脆弱性研究——以兰州市为例

Vulnerability Study for Public Transport Network of Valley City:Case of Lanzhou

应用复杂网络理论,以兰州市为例研究河谷型城市公交网络的脆弱性.首先,根据L空间模型构建城市公交站点网络,分析该网络静态拓扑特性.然后,基于随意攻击和蓄意攻击两种攻击模式,建立城市公交网络脆弱性测度指标,并对两种攻击模式下公交网络的脆弱性进行分析.研究结果表明,由于兰州市特殊的河谷型地形特征,在蓄意攻击下的脆弱性远远强于其在随意攻击下的脆弱性.最后,结合公交网络脆弱性特征研究公交网络核心站点选取策略.结果表明,基于度的核心站点选择更适合兰州市公交网络,这为兰州市交通规划和交通网络优化决策提供理论依据.

The public transport network vulnerability of Lanzhou is studied based on complex network theory. Firstly, the bus stations network are constructed according to the space L model and the static topological properties is analyzed. Then, the metrics about thevulnerability of urban public transport network is established on the basis of the random failure and selective attack of complex networks, and the corresponding performances are presented. The results show that the vulnerability of a selective attack is far stronger than that of random failure because of the special features of the valley terrain in Lanzhou. Finally, combined with the vulnerability of public transport network, the key station selection strategy is studied. It shows that the selection strategy based on the degree is more suitable for Lanzhou. These results provide a theoretical basis to support decision making on transportation planning and urban traffic network optimization for Lanzhou.