Assessing Compound Flooding From Landfalling Tropical Cyclones on the North Carolina Coast

Avantika Gori, Ning Lin, James Smith

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Tropical cyclone (TC) events are major drivers of compound flooding due to the interaction of wind-driven storm surge and TC rainfall. Traditionally, coastal flood risk models have only taken into account surge flooding, even though it is known that the role of rainfall-runoff is critical. There is limited understanding about the types of TC events that are capable of producing significant compounding and how site conditions at the coast affect the extent to which storm surge and rainfall-runoff interact. This study investigates a suite of historical TCs making landfall near the Cape Fear River Estuary, NC, through a loosely coupled physical modeling methodology in order to draw conclusions about the spatial and temporal patterns of storm surge and rainfall that are able to induce significant compound impacts. Results indicate that intense outer rain bands falling over inland portions of the study area can be a driver of river-surge compounding (increasing river levels by up to 0.36 m), while intense eyewall rainfall along the coast can result in localized compound impacts to coastal streams and tributaries if peak rainfall occurs near the time of peak storm tide. These localized compound impacts can result in defined interaction zones, where neither storm tide alone nor rainfall-runoff alone can fully explain the observed maximum water levels. These results provide insight about the relative timing and spatial patterns of rainfall and storm surge that are capable of inducing compound flooding during TC events.

Original languageEnglish (US)
Article numbere2019WR026788
JournalWater Resources Research
Volume56
Issue number4
DOIs
StatePublished - Apr 1 2020

All Science Journal Classification (ASJC) codes

  • Water Science and Technology

Keywords

  • compound event
  • flood Modeling
  • flood hazard
  • tropical cyclones

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