Floods can lead to substantial direct damages to transportation infrastructure assets and cause significant indirect losses to communities that rely on the transportation network. This makes it crucial to understand the network's functional and operational deterioration caused by floods to help transportation agencies to either mitigate or plan for consequences of failures. To achieve this goal, this study uses an actual segment of a transportation network as a testbed to develop a network-level multi-step assessment framework to evaluate the flood-related risks and implement specific flood mitigation measures to the testbed. The multi-step framework first accomplishes assessments of the investment of pre-flood mitigation strategies, post-flood asset recovery cost, and indirect post-flood traffic delay and opportunity losses of the network. Then, a life-cycle benefit to cost analysis is applied to estimate the performance of the various flood mitigation strategies. This systematic effort is expected to provide a holistic overview of the flood risk to the network and a conservation-oriented means for optimizing and prioritizing mitigation investments while ensuring that the system resilience is sufficiently improved with respect to capability for absorbing flood hazards and adapting to partially-dysfunctional network operations during floods.

洪水会对交通基础设施资产造成重大直接损害，并对依赖交通网络的社区造成重大的间接损失。这使得了解洪水导致的网络功能和运营恶化至关重要，以帮助运输机构减轻或规划故障后果。为实现这一目标，本研究使用交通网络的实际部分作为试验台，开发网络级多步骤评估框架，以评估与洪水相关的风险，并在试验台上实施具体的防洪措施。多步框架首先完成对洪水前缓解策略的投资、洪水后资产恢复成本以及网络的间接洪水后流量延迟和机会损失的评估。然后，应用成本分析的生命周期收益来估计各种防洪策略的性能。预计这项系统性工作将为网络提供洪水风险的整体概览，并提供一种以保护为导向的手段，用于优化和优先考虑缓解投资，同时确保系统弹性在吸收洪水灾害和适应部分洪水的能力方面得到充分提高。 - 洪水期间功能失调的网络操作。