网络失效条件下的北京市城市道路交通网络统计特征分析

为获知城市道路交通网络的结构和网络特性，根据实际的拓扑和交通流数据，采用原始法进行建模，将路口抽象为节点，将路段抽象为网络的连边，构建城市道路交通网络模型。通过MATLAB和pajek计算，分析了道路抽象、基础设施和动态交通3种网络的统计特征。对基础设施和动态交通网络的强度分布的分析，证实了北京市城市道路网络中的这两种网络均为无标度网络；通过计算基础设施网络的节点强度和介数等特征指标，获知了北京市城市道路的重要路口和路段。最后，仿真分析了3种网络在不同网络失效条件下的重要统计特征，结果表明北京市城市道路基础设施和动态交通网络既具有鲁棒性又具有脆弱性。

nalysis of statistical characteristics of Beijing urbanroad traffic networks in network failure

To learn the structure and network characteristics of urban road transportation network, we employ original method to construct a model based on practical topological data and traffic flow data. We construct urban road transportation network model with an intersection as an abstract vertex and a road as an abstract network edge. Through MATLAB and pajek computation, we analyze statistical characteristics of road abstract network, infrastructure network and dynamic traffic network. Strength distribution analysis of infrastructure network and dynamic traffic network demonstrate that such two Beijing urban road networks are all scale free networks. By such characteristic indexes as vertex strength and the betweenness of the infrastructure network, we acquire the important intersections and road segments of Beijing city. We eventually analyze the important statistical characteristics of the three networks in different network failure conditions through simulations. Results show that the infrastructure network and dynamic traffic network of Beijing urban roads are of both robustness and vulnerability.