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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Nature-based flood protection: the efficiency of vegetated foreshores in reducing wave run-up
Nature-based flood protection: the efficiency of vegetated foreshores in reducing wave run-up
Author : VINCENT VUIK(1,2), SEBASTIAAN N. JONKMAN(1), BAS W. BORSJE(3,4), TOMOHIRO SUZUKI(1,5), ISABELLA KRATZER(6) & TJEERD J. BOUMA(6
ABSTRACT
It is generally recognized that vegetation fields can dissipate wave energy, authorizing the statements that vegetated
foreshores can reduce the wave loads on coastal dikes. This paper actually quantifies the efficiency of vegetated
foreshores in reducing the wave run-up on the outer slope of coastal dikes. The spectral wave model SWAN, which is
used to compute the wave transformation over vegetated foreshores, has been validated using recent measurements of
wave propagation over several salt marshes in the Netherlands under severe storm conditions. This article shows that in
case that vegetated foreshores are present along coastal dikes, the wave run-up height on the outer slope of the dike is
substantially reduced during storm conditions with large water depths and high waves. Vegetated foreshores are more
effective in reducing wave loads on the dike than bare foreshores with the same geometry, even when vegetation in their
fragile winter state is compared with a bottom on which ripples have been formed. Because the required crest height of a
dike is strongly related to the wave run-up height, a reduction in wave run-up height allows for lower crests and more
slender dike bodies. We conclude that the construction of vegetated foreshores can be considered as a sound alternative
for traditional dike reinforcement methods.
File Size : 1,090,230 bytes
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 12/08/2015
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