Attenuation of storm surges by coastal mangroves

John M. Montgomery (Corresponding Author), Karin R. Bryan, Julia C. Mullarney, Erik Martijn Horstman

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Abstract

The interaction between mangroves and storm surges is explored using an analytical solution. A simplified momentum equation, balancing vegetation drag and pressure gradient, is combined with the continuity equation resulting in a diffusion equation. Assuming a simplified environment, a one‐dimensional analytical solution is obtained to predict peak surge level across a forest. The solution accurately reproduces peak water level of a 10‐year return period flood event in mangroves in the Firth of Thames, New Zealand, and in Ten Thousand Islands, Florida, during Hurricane Charley. Vegetation properties that determine the capacity of mangroves to reduce surges are forest density and cross‐shore extent. Storm characteristics—flood duration and peak water level at the forest fringe—also influence surge attenuation. Mangroves are shown to be an effective form of coastal flood protection if forests are sufficiently wide/dense, relative to the surge decay length scale, to restrict water exchange during a storm.
Original languageEnglish
Pages (from-to)2680-2689
Number of pages10
JournalGeophysical research letters
Volume46
Issue number5
DOIs
Publication statusPublished - 16 Mar 2019

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storm surges
storm surge
mangrove
attenuation
vegetation
water level
water
hurricanes
water exchange
return period
pressure gradient
hurricane
drag
continuity equation
New Zealand
momentum
pressure gradients
gradients
decay

Keywords

  • UT-Hybrid-D

Cite this

Montgomery, John M. ; Bryan, Karin R. ; Mullarney, Julia C. ; Horstman, Erik Martijn. / Attenuation of storm surges by coastal mangroves. In: Geophysical research letters. 2019 ; Vol. 46, No. 5 . pp. 2680-2689.
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Attenuation of storm surges by coastal mangroves. / Montgomery, John M. (Corresponding Author); Bryan, Karin R.; Mullarney, Julia C.; Horstman, Erik Martijn.

In: Geophysical research letters, Vol. 46, No. 5 , 16.03.2019, p. 2680-2689.

Research output: Contribution to journalArticleAcademicpeer-review

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AB - The interaction between mangroves and storm surges is explored using an analytical solution. A simplified momentum equation, balancing vegetation drag and pressure gradient, is combined with the continuity equation resulting in a diffusion equation. Assuming a simplified environment, a one‐dimensional analytical solution is obtained to predict peak surge level across a forest. The solution accurately reproduces peak water level of a 10‐year return period flood event in mangroves in the Firth of Thames, New Zealand, and in Ten Thousand Islands, Florida, during Hurricane Charley. Vegetation properties that determine the capacity of mangroves to reduce surges are forest density and cross‐shore extent. Storm characteristics—flood duration and peak water level at the forest fringe—also influence surge attenuation. Mangroves are shown to be an effective form of coastal flood protection if forests are sufficiently wide/dense, relative to the surge decay length scale, to restrict water exchange during a storm.

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