交通网络演化规律

Evolutionary Property of Traffic Network

摘要:

基于城市空间结构与交通系统的动态互馈原理和交通系统的内在运行机制，以微观机理融合宏观机制为指导思想构建交通网络演化模型与算法，研究交通网络演化规律.在短期内，纳入道路用户外部性构造目标函数，进而建立交通系统最优模型；在较长时期，利用交通系统和城市空间结构之间的动态互馈作用、区域间经济联系的概念以及无标度网络演化规则的设计理念设计交通网络演化规则，刻画演化机制.实例研究表明，随着网络的演化，出现了层次现象并越来越清晰，更为重要的是，交通网络总费用随之下降；利用介数中心性定义了一种新的交通网络熵，该网络熵也呈现减小趋势，揭示了随着交通网络渐进地向有序演化，交通系统性能得以不断优化.

Abstract:

A traffic network evolution model and algorithm to disclose the traffic network evolution laws were proposed according to microscopic dynamics and macroscopic mechanism based on the dynamic interaction mechanism between traffic system and urban spatial structure,and the internal operation mechanism of traffic system.In the short term,the road users externality was taken into account to formulate objective function;furthermore,an optimal traffic network model was established. In the long run,the dynamic interaction mechanism between traffic system and urban spatial structure and the design idea of evolutionary rule of scale-free network were combined with the economic relation concept to design traffic network evolutionary rules and to characterize evolutionary mechanisms.Experiments show that with the network evolving,hierarchy emerges and turns clearer,and what is more significant is that the total network cost decreases in the process;the computation of a new network entropy defined by betweenness centrality illustrates that the network entropy becomes smaller and the traffic network evolves to a more orderly structure with improving performance.