School of Hydraulic Engineering, Dalian University of Technology, Dalian, 116024, China; Centre for Water Systems, College of Engineering, Mathematics and Physical Sciences, University of Exeter, North Park Road, Harrison Building, Exeter, EX4 4QF, UK.
Centre for Water Systems, College of Engineering, Mathematics and Physical Sciences, University of Exeter, North Park Road, Harrison Building, Exeter, EX4 4QF, UK.
Water Res. 2019 Oct 15;163:114852. doi: 10.1016/j.watres.2019.114852. Epub 2019 Jul 10.
Urban flooding has become a global issue due to climate change, urbanization and limitation in the capacity of urban drainage infrastructures. To tackle the growing threats, it is crucial to understand urban surface flood resilience, i.e., how urban drainage catchments can resist against and recover from flooding. This study proposes a grid cell based resilience metric to assess urban surface flood resilience at the urban drainage catchment scale. The new metric is defined as the ratio of the number of unflooded grid cells to the total grid cell number in an urban drainage catchment. A two-dimensional Cellular Automata based model CADDIES is used to simulate urban surface flooding. This methodology is demonstrated using a case study in Dalian, China, which is divided into 31 urban drainage catchments for flood resilience analysis. Results show the high resolution resilience assessment identifies vulnerable catchments and helps develop effective adaptation strategies to enhance urban surface flood resilience. Comparison of the new metric with an existing metric reveals that new metric has the advantage of fully reflecting the changing process of system performance. Effectiveness of adaptation strategies for enhancing urban surface flood resilience is discussed for different catchments. This study provides a new way to characterize urban flood resilience and an in-depth understanding of flood resilience for urban drainage catchments of different characteristics, and thus help develop effective intervention strategies for sustainable sponge city development.
由于气候变化、城市化以及城市排水基础设施能力的限制，城市内涝已成为全球性问题。为了应对日益增长的威胁，了解城市地表洪水韧性至关重要，即城市排水流域如何抵御洪水以及从洪水中恢复。本研究提出了一种基于栅格单元的韧性指标，以评估城市排水流域尺度的城市地表洪水韧性。该新指标定义为城市排水流域中未淹没栅格单元数与总栅格单元数的比值。使用基于二维元胞自动机的 CADDIES 模型来模拟城市地表洪水。使用中国大连的一个案例研究来演示该方法，该案例研究分为 31 个城市排水流域进行洪水韧性分析。结果表明，高分辨率的韧性评估可以识别脆弱的流域，并有助于制定有效的适应策略，以提高城市地表洪水韧性。将新指标与现有指标进行比较表明，新指标具有完全反映系统性能变化过程的优势。还讨论了不同流域增强城市地表洪水韧性的适应策略的有效性。本研究为描述城市洪水韧性提供了一种新方法，并深入了解了不同特征的城市排水流域的洪水韧性，从而有助于制定有效的干预策略，以实现可持续的海绵城市发展。
