The poor maintenance of transportation (road)networks, natural disasters, and unforeseen attacks lead to the emergency .This paper proposes emergency impact assessment indices to evaluate the emergency effects of link in transportation(road)networks.We also construct the link importance indices that allow for the ranking of links in transportation networks in terms of their emergency importance , should they be destroyed due to the e-mergency(natural disaster, great incident, great congestion, broken-down bridge, and etc.).The indices are applicable in the case of user-optimization, system-optimization and efficiency loss .We give the property of the indicators and discuss the relationship between the indices in the case of user -optimization , system-optimization and efficiency loss .Numerical transportation network examples illustrate the proposed qualitative emergency indi-ces.The evaluation of the link importance is very important to the road plan , road maintenance and network vul-nerability analysis .%近年来，由于自然灾害，不断地环境恶化以及不可预测的灾害侵袭，突发事件时有发生，突发事件可能对交通网络产生非常严重的影响。本文给出了一些指标来表征突发事件对交通网络的影响程度。这些指标适用于用户最优、系统最优以及效率损失等情形。我们给出了这些指标的性质并讨论了在用户最优、系统最优以及效率损失等情形下的指标之间的关系。交通网络的数值算例表明了关于突发事件的指标的合理性。突发事件对交通网络的影响程度评估对于道路规划、道路维护以及网络脆弱性分析均有重要意义。
展开▼
