Journal
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Volume 124, Issue 9, Pages 6643-6657Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019JC015063
Keywords
wave modeling; swash; runup; frequency spread
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Funding
- RETOS INVESTIGACION 2014 program of the Spanish Ministry of Economy and Competitiveness [BIA2014-59718-R]
- Regione Autonoma della Sardegna
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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.
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