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<p>The superposition effect of river floods and urban waterlogging is becoming more common in urbanized watersheds. A quantitative assessment method was proposed based on the copula function and hydrological and hydrodynamic models to explore the exacerbating effect on urban inundation. The suggested method was applied to construct the joint distribution pattern of river flood and heavy rainfall in a typical urbanized watershed, the North Canal Basin in Tongzhou District, Beijing. An integrated model was constructed to simulate the hydrological and hydrodynamic processes during river floods and urban waterlogging. The 38 different combination patterns of rainfall and river flood scenarios were analysed, and the results showed a significant exacerbating effect on urban inundation when a river flood encounters heavy rainfall. The insight factor analysis showed that the water depth was more sensitive to river flooding changes than to rainfall. Taking the 50-year return period as an example, compared with scenarios with only rainfall or river flood, the maximum water depth under the superimposed scenarios increased by 1.7 and 0.2 m, respectively. The simulation results indicated that the simultaneous occurrence of river floods and heavy rainfall would have a superimposed amplification effect on urban inundation risk.</p>

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Quantitative assessment of exacerbating effect on urban inundation when river flood encounters heavy rainfall in an urbanized watershed

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Haijia Zhang,
  • Jiahong Liu,
  • Jinjun Zhou,
  • Chao Mei,
  • Jia Wang,
  • Tianxu Song

摘要

The superposition effect of river floods and urban waterlogging is becoming more common in urbanized watersheds. A quantitative assessment method was proposed based on the copula function and hydrological and hydrodynamic models to explore the exacerbating effect on urban inundation. The suggested method was applied to construct the joint distribution pattern of river flood and heavy rainfall in a typical urbanized watershed, the North Canal Basin in Tongzhou District, Beijing. An integrated model was constructed to simulate the hydrological and hydrodynamic processes during river floods and urban waterlogging. The 38 different combination patterns of rainfall and river flood scenarios were analysed, and the results showed a significant exacerbating effect on urban inundation when a river flood encounters heavy rainfall. The insight factor analysis showed that the water depth was more sensitive to river flooding changes than to rainfall. Taking the 50-year return period as an example, compared with scenarios with only rainfall or river flood, the maximum water depth under the superimposed scenarios increased by 1.7 and 0.2 m, respectively. The simulation results indicated that the simultaneous occurrence of river floods and heavy rainfall would have a superimposed amplification effect on urban inundation risk.