Preprints
https://doi.org/10.5194/nhess-2021-308
https://doi.org/10.5194/nhess-2021-308

  10 Nov 2021

10 Nov 2021

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

Assessing tropical cyclone compound flood risk using hydrodynamic modelling: a case study in Haikou City, China

Qing Liu, Hanqing Xu, and Jun Wang Qing Liu et al.
  • Key Laboratory of Geographic Information Science of Ministry of Education, School of Geographic Science, East China Normal University, Shanghai, 200241, China

Abstract. The co-occurrence of storm tide and rainstorm during tropical cyclones (TCs) can lead to compound flooding in low-lying coastal regions. The assessment of TC compound flood risk can provide vital insight for research on coastal flooding prevention. This study investigates TC compound flooding by constructing a storm surge model and overland flooding model using Delft3D Flexible Mesh (DFM), illustrating the serious consequences from the perspective of storm tide. Based on the probability distribution of storm tide, this study regards TC1415 as the 100-year event, TC6311 as the 50-year event, TC8616 as the 25-year event, TC8007 as the 10-year event, and TC7109 as the 5-year event. The results indicate that the coastal area is a major floodplain, primarily due to storm tide, with the inundation severity positively correlated with the height of the storm tide. For 100-year TC event, the inundation area with a depth above 1.0 m increases by approximately 2.5 times when compared with 5-year TC event. The comparison of single-driven flood (storm tide flooding and rainstorm inundation) and compound flood hazards shows that simply accumulating every single-driven flood hazard to define the compound flood hazard may cause underestimation. For future research on compound flooding, copula function can be adopted to investigate the joint occurrence of storm tide and rainstorm to reveal the severity of extreme TC flood hazards.

Qing Liu et al.

Status: open (until 24 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2021-308', Anonymous Referee #1, 03 Dec 2021 reply

Qing Liu et al.

Qing Liu et al.

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Short summary
The coastal area is a major floodplain in compound flood events in coastal cities, primarily due to storm tide, with the inundation severity positively correlated with the height of the storm tide. Simply accumulating every single-driven flood hazard (rainstorm inundation and storm tide flooding) to define the compound flood hazard may cause underestimation. The assessment of TC compound flood risk can provide vital insight for research on coastal flooding prevention.
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