Assessing catchment scale flood resilience of urban areas using a grid cell based metric.
Assessing catchment scale flood resilience of urban areas using a grid cell based metric.
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DOI：
10.1016/j.watres.2019.114852
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发表时间：
2019-07
期刊：
影响因子：
12.8
通讯作者：
Yuntao Wang;Fanlin Meng;Haixing Liu;Chi Zhang;G. Fu
中科院分区：
文献类型：
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作者：
Yuntao Wang;Fanlin Meng;Haixing Liu;Chi Zhang;G. Fu
由于气候变化、城市化和城市排水基础设施能力的限制，城市洪水已成为一个全球性问题。为了应对日益严重的威胁，了解城市地表洪水复原力至关重要，即，城市排水集水区如何抵御洪水并从洪水中恢复。本研究提出了一个基于网格单元的弹性指标，以评估城市排水流域尺度的城市地表洪水弹性。新的度量被定义为城市排水流域中未淹没网格单元数与总网格单元数的比率。本文采用二维元胞自动机模型CADALO对城市地面洪水进行模拟。以大连市为例，将城市排水系统划分为31个集水区，进行洪水恢复力分析。结果表明，高分辨率的弹性评估确定脆弱的集水区，并有助于制定有效的适应战略，以提高城市地表洪水的弹性。通过与已有指标的比较，表明新指标具有能充分反映系统性能变化过程的优点。针对不同的集水区，讨论了提高城市地表洪水恢复力的适应策略的有效性。该研究为表征城市洪水恢复力提供了一种新的方法，有助于深入了解不同特征的城市排水集水区的洪水恢复力，从而为海绵城市的可持续发展制定有效的干预策略。
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.