基于层间关联性的复合公共交通网络布局优化策略

Composite public transport network layout optimization strategy based on interlayer correlation

针对地铁与公交网络耦合问题,基于北京市公共交通线网数据开展实证分析,解析地铁网络与公交网络耦合形成的地铁-公交复合网络结构性能,探究复合公共交通网络布局优化策略.首先,构建地铁拓扑网络和公交拓扑网络,根据换乘走行距离设置耦合规则,构建地铁-公交复合网络.其次,围绕单层网络、双层网络分别测算拓扑指标(平均最短路径长度、平均聚类系数、全局效率和局部效率等)与韧性指标(最大双连通子图规模和割点数目等),分析双层复合公共交通网络结构性能.再次,提出基于Kendall秩相关系数的复合网络层间关联性指标,量化复合网络的耦合强度.最后,提出4种层间关联性提升策略,并开展“公交线路生成实验”,验证各策略对于网络拓扑和韧性性能的影响.研究结果表明:北京市复合公共交通网络层间关联性呈现正相关关系,“薄弱环节优先”的层间关联性提升策略表现最佳,预期能够实现全局效率提高3.89%、局部效率提高25.62%、网络割点减少33.84%的目标,为进一步优化城市公共交通网络规划布局提供决策依据.

This study addresses the coupling of subway and bus networks,analyzing the structural performance of the composite network formed by these networks in Beijing's public transport system and exploring strategies for optimizing its layout.Firstly,subway and bus transit network topologies are constructed,and a coupling rule based on transfer distance is applied to formulate the subway-bus composite network.Subsequently,topological metrics(average shortest path length,average clustering coefficient,global efficiency,and local efficiency)and resilience indicators(size of the largest biconnected subgraph and number of network cut-points)are computed for both single-layer and double-layer networks to assess structural performance.Furthermore,an interlayer correlation index based on the Kendall rank correlation coefficient is proposed to quantify coupling strength.Finally,four strategies for enhancing interlayer correlation are proposed and validated through experiments generating bus routes.Results indicate that a positive correlation in interlayer correlation of Beijing's composite public transport network.The“weak link priority”inter-layer correlation enhancement strategy shows the most promise,expected to improve global efficiency by 3.89%,local efficiency by 25.62%,and reduce network cut-points by 33.84%.These findings provide decisionmakers with insights for further optimizing urban public transport network planning.