西安地铁网络演化特征评估

Characterization of Xi'an Metro Network Evolution

交通运输网络的稳定发展有助于增强系统韧性与可靠性。本文基于复杂网络理论,使用Space L网络建模方法构建了西安地铁早晚高峰客流加权网络模型,通过改进的局部指标与全局体系结合复杂网络演化特性,评估了西安地铁网络结构属性与节点中心属性的时空演化特征。结果发现:(1)随着时间推移,西安地铁网络的连通性与韧性有显著提升。(2)网络密度增加,节点可访问性得到了提高,然而单个站点的重要性是两极化的,少数站点具有较高的节点中心性,预计新建线路环线的开通,可以进一步提高网络服务能力,更好地缓解拥堵。(3)随着阶段及网络复杂程度增加,节点介数中心性总体趋势趋于右长尾的正态分布,西安地铁网络属于良性发展。(4)随着网络的拓展,西安地铁高紧密度站点越来越少,反之低紧密度站点占比越来越大,整体线网的重心有向南演化趋势。

The stable development of transportation network helps to enhance system resilience and reliability.Based on complex network theory,a weighted network model of Xi'an Metro morning and evening peak passenger flow is constructed using Space L network modeling method,and the temporal and spatial evolution characteristics of structural attributes and node center attributes of Xi'an Metro network are evaluated by combining the improved local indexes and global system with the evolution characteristics of the complex network.The results are found:1)The connectivity and resilience of the Xi'an Metro network has improved significantly over time.2)The network density increases,which improves the accessibility is improved,however,the importance of individual stations is polarized,and a few stations have high node centrality,and it is expected that the opening of the new line loop can further improve the network resilience and service capacity,and better relieve congestion.3)As the period and network complexity increase,the overall trend of node median centrality tends to the right long-tailed normal distribution,and the Xi'an Metro network belongs to the benign development.4)With the expansion of the network,Xi'an Metro high closeness station is less and less,on the contrary,low closeness station accounted for a larger and larger proportion of the overall network of the center of gravity to the south of the evolution trend.