Preprints
https://doi.org/10.5194/nhess-2021-141
https://doi.org/10.5194/nhess-2021-141

  18 May 2021

18 May 2021

Review status: this preprint is currently under review for the journal NHESS.

Levee breach-induced compound flood modeling in Qianbujing Creek, Shanghai during Typhoon "Fitow"

Yuhan Yang1, Jie Yin2,3,4, Weiguo Zhang1, Yan Zhang2, Yi Lu2, Aoyue Xiao2, Yunxiao Wang2, and Wenming Song2 Yuhan Yang et al.
  • 1State Key Laboratory of Estuarine and Coastal Research, East China Normal University, China
  • 2Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University, China
  • 3Department of Civil and Environmental Engineering, Princeton University, USA
  • 4Institute of Eco-Chongming, East China Normal University, China

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 severity (extent and depth). 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 settlement and 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.

Yuhan Yang et al.

Status: open (until 29 Jun 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2021-141', Anonymous Referee #1, 04 Jun 2021 reply
    • AC1: 'Reply on RC1', Yuhan Yang, 11 Jun 2021 reply
  • RC2: 'Comment on nhess-2021-141', Anonymous Referee #2, 14 Jun 2021 reply

Yuhan Yang et al.

Yuhan Yang et al.

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Short summary
It's the first time to investigate the compound flooding process of heavy rain and levee breach-induced flooding. Real-life cases of historical flooding events have been adequately investigated. Our results provide a comprehensive view of the spatial patterns of the flood evolution, the dynamic process and mechanism of these cases which can help decision-makers to develop effective emergency response plans and flood adaptation strategies.
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