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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : SwanĄŻs underestimation of long wave penetration into coastal systems
SwanĄŻs underestimation of long wave penetration into coastal systems
Author : JACCO GROENEWEG(1), JOANA VAN NIEUWKOOP(2)
olved issues in the spectral wave model SWAN is that wave penetration of swell waves into complex tidal
inlets or estuaries is often underestimated by SWAN. Previous studies into this problem revealed that two-dimensional
nonlinear interactions, and especially the sub-harmonic interactions could play a major role in the transmission of energy
from flats into navigation channels. Since this process is missing in SWAN, this process can explain SWANĄŻs
underprediction of wave energy penetration into a complex tidal inlet system. With this mechanism in mind, it was
examined in this study under which conditions SWAN underestimates the wave energy when propagating into complex
tidal inlet systems. For this purpose, various existing hindcasts in complex tidal areas have been reanalysed. It was
concluded that a mismatch between measured and computed swell energy is often already observed in the tidal inlet for
conditions where the ebb-tidal delta is of influence. Whether or not the low-frequency wave energy is underestimated by
SWAN is to a large extent determined by the local geometry. For a number of cases it was clearly seen that 2D nonlinear
interaction plays an important role. In those cases the waves first propagated over the ebb-tidal delta or tidal flats and
subsequently came across a channel. From 2D wave spectra it was seen that the observed waves could enter or cross
the channel, whereas the computed waves were refractively trapped to the channel edges.Form Required :
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 19/08/2015
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