College of Architecture and Urban Planning, Guangzhou University, Guangzhou 510006, China.
Civil Engineering, Institute of Urban Water Management, University of Kaiserslautern, Kaiserslautern 67663, Germany.
Sci Total Environ. 2022 Aug 15;834:155267. doi: 10.1016/j.scitotenv.2022.155267. Epub 2022 Apr 18.
As flooding risks rise in urban areas, research suggests combining low impact development (LID) and grey infrastructure (GREI) in urban drainage systems. Several frameworks have been proposed to plan such coupled systems, but there is not a comprehensive framework to assess their resilience under diverse failure scenarios and sources of uncertainty. This study proposes a framework which considers both technological and operational resilience. Technological resilience has to do with the performance of the system under extreme loads. Operational resilience has to do with the performance and long-term efficiency of the system after structural damage or degradation, using appropriate probability distributions to quantify the likelihood of failures. The proposed framework is based on an optimization and multi-criteria decision-making platform. It improves on previous research, which lacked consideration of uncertainty in resilience over the life span. We also apply the proposed framework to a real-world test case, and find that in a high-density urban area, a coupled system is more cost-effective than GREI alone. Furthermore, decentralized systems with greater flexibility show significantly better technological and operational resilience. The proposed framework can better support decision-making for planning robust and cost-effective urban drainage systems, particularly in highly urbanized areas.
随着城市地区洪灾风险的增加，研究表明应将低影响开发（LID）和灰色基础设施（GREI）结合到城市排水系统中。已经提出了几个框架来规划此类耦合系统，但没有一个全面的框架来评估它们在各种故障场景和不确定性来源下的恢复力。本研究提出了一个同时考虑技术和运行恢复力的框架。技术恢复力与系统在极端负荷下的性能有关。运行恢复力与结构损坏或退化后系统的性能和长期效率有关，使用适当的概率分布来量化故障的可能性。所提出的框架基于优化和多准则决策平台。它改进了以前的研究，以前的研究缺乏对整个寿命期内恢复力不确定性的考虑。我们还将提出的框架应用于一个真实案例，发现高密度城区中，耦合系统比 GREI 单独使用更具成本效益。此外，具有更大灵活性的分散式系统表现出更好的技术和运行恢复力。所提出的框架可以更好地支持规划稳健且具有成本效益的城市排水系统的决策，特别是在高度城市化地区。
