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The effects of tides on swash statistics on an intermediate beach

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Abstract
  • Swash hydrodynamics were investigated on an intermediate beach using runup data obtained from video images. Under mild, near-constant, offshore wave conditions, the presence of a sandbar and the tidally controlled water depth over its crest determined whether most of the incoming waves broke before reaching the shoreline. This forced a change in the pattern of wave energy dissipation across the surf zone between low and high tide, which was reflected by changes to swash on time scales of a few hours. Significant runup height (Rs, defined as 4 times the standard deviation of the waterline time series), was found to vary by a factor of 2 between low tide, when most of the waves were breaking over the sandbar (Rs/Hs ≈ 1.5, where Hs is the offshore significant wave height) and high tide, when the waves were barely breaking (Rs/Hs ≈ 2.7). The increase in wave energy dissipation during low tide was also associated with changes in swash maxima distribution, a decrease in mean swash period, and increasing energy at infragravity frequencies. Bispectral analysis suggested that this infragravity modulation might have been connected with the presence of secondary waves.
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  • Guedes, R. M. C., K. R. Bryan, G. Coco, and R. A. Holman (2011), The effects of tides on swash statistics on an intermediate beach, Journal of Geophysical Research, 116, C04008, doi:10.1029/2010JC006660.
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  • 116
Déclaration de droits
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  • R.M.C.G. and G.C. were funded by the (New Zealand) Foundation for Research, Science and Technology. K.R.B. acknowledges the support of the Hanse Wissenschaftskolleg (Germany).
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