基于网络效率的日变路网脆弱性识别方法

在日变动态路网背景下,采用传统的静态脆弱性识别方法有可能无法完全辨识路网系统单元的脆弱性,这不利于事件管理规划和应急物资调配工作的开展.为此,以日变路网为研究对象,在单路段关闭情形下,定义了基于网络效率的路网动态脆弱性指标,表示为退化路网动态网络效率与完好路网静态网络效率的相对变化率.提出了基于单路段关闭的日变动态配流模型刻画日变路网流量的非均衡动态演化,并给出了相应算法.采用提出的指标和模型在实例网络中验证了日变路网脆弱性识别方法的可行性.对比分析了基于动态网络效率和基于静态网络效率的脆弱性识别结果,发现前者的识别率高于后者.

Day-to-day Road Network Vulnerability Identification Based on Network Efficiency

The unit vulnerability of road network system may not be fully distinguished by the classic static vulnerability identification in a day- to-day road network, and the conducting of incidents management planning and emergency material allocating is hindered. With the day-to-day road network as research object, a dynamic vulnerability index, which is a discrepancy ratio between the degraded road network efficiency and the origin road network efficiency, is defined based on network efficiency measure under single- linkclosed scenario. A single-link-closed day-to-day dynamic assignment model is proposed to depict the disequilibrium flow evolution of day-to-day road network, and a corresponding algorithm is given. The proposed index and model is applied on an example network to confirm the feasibility of day-to-day road network vulnerability identification. By comparing results of the dynamic network efficiency based vulnerability identification and the static one, it shows that the road network vulnerability identification rate based on dynamic network efficiency is higher than that based on static network efficiency.