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Numerical Assessment of Infragravity Swash Response to Offshore Wave Frequency Spread Variability

Abstract: We use a numerical model, already validated for this purpose, to simulate the effect of wave frequency spread on wave transformation and swash amplitudes. Simulations are performed for planar beach slope cases and for offshore wave spectra whose frequency spread changes over realistic values. Results indicate that frequency spread, under normally approaching waves, affects swash amplitudes. For moderately dissipative conditions, the significant infragravity swash increases for increasing values of the offshore frequency spread. The opposite occurs under extremely dissipative conditions. The numerical analysis suggests that this inverted pattern is driven by the effect that different distributions of incoming long?wave energy have on low?frequency wave propagation and dissipation. In fact, with large frequency spreads, wave groups force relatively short subharmonic waves that are strongly enhanced in the shoaling zone. This process leads to an infragravity swash increase for increasing frequency spread under moderately dissipative conditions in which low?frequency energy dissipation in shallow water is negligible or small. However, under extremely dissipative conditions, the significant low?frequency energy dissipation associated with large frequency spreads overturns the strong energy growth in the shoaling zone eventually yielding an infragravity swash decrease for increasing frequency spread.

 Fuente: Journal of Geophysical Research. Oceans Volume124, Issue9 September 2019 Pages 6643-6657

 Editorial: John Wiley & Sons

 Fecha de publicación: 01/09/2019

 Nº de páginas: 15

 Tipo de publicación: Artículo de Revista

 DOI: 10.1029/2019JC015063

 ISSN: 2169-9275,2169-9291,0148-0227

 Proyecto español: BIA2014-59718-R

 Url de la publicación: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JC015063