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Levee breach-induced compound flood modeling in Qianbujing Creek, Shanghai during Typhoon “Fitow”
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  • Yuhan Yang,
  • Jie Yin,
  • Weiguo Zhang,
  • Yan Zhang,
  • Yi Lu,
  • Aoyue Xiao,
  • Yunxiao Wang,
  • Wenming Song
Yuhan Yang
East China Normal University
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Jie Yin
East China Normal University
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Weiguo Zhang
East China Normal University
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Yan Zhang
East China Normal University
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Yi Lu
East China Normal University
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Aoyue Xiao
East China Normal University
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Yunxiao Wang
East China Normal University
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Wenming Song
East China Normal University
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Abstract

Levee breach-induced flooding occurs occasionally but always causes considerable losses. A serious flood event occurred due to the collapse of a 15-m-long levee section in Qianbujing Creek, Shanghai, China, during typhoon “Fitow” in Oct, 2013. Heavy rainfall associated with the typhoon intensified the flood extent. This study investigates the flood evolution to understand the dynamic nature of flooding and the compound effect using a well-established 2D hydro-inundation model (Floodmap) to reconstruct this typical event. Our simulation results provide a comprehensive view of the spatial patterns of the flood evolution. The worst-hit areas are predicted to be low-lying farmland. Temporal evaluations suggest that the most critical time for flooding prevention is in the early hours after dike failure. In low-elevation areas, temporary drainage measures and flood defenses are equally important. The validation of the model demonstrates the reliability of the approach.