Please use this identifier to cite or link to this item: http://repositorio.lnec.pt:8080/jspui/handle/123456789/1010928
Title: Bound and free infragravity waves over a bar
Authors: Mendes, D.
Pires Silva, A.
Pinto, J.
Fortunato, A. B.
Keywords: Infragravity waves;Bispectral analysis;Field observations;S. Jacinto
Issue Date: Jun-2018
Publisher: Instituto Hidrogrâfico
Citation: http://www.hidrografico.pt/images/contents/Documentacao/jornadas_2018/Actas_5JEH.pdf
Abstract: This study aims to investigate the changes in the infragravity wave energy under partial short-wave breaking conditions induced by a longshore bar. Field observations of near-bottom pressure records on a cross-shore array were analysed for such purpose. The bispectrum was employed to detect the phase-coupling between short and infragravity wave frequencies. This allowed to separate the infragravity wave energy in bound and free energy components. The bar crest induced a decrease on the short-wave energy due to depth-induced breaking. At the same location, a damping on the bound infragravity wave energy was observed. This damping coincides with a negative value of the short-wave radiation stress cross-shore gradient. This provides evidence that bound infragravity wave energy decreases with a reduction in the forcing.
URI: https://repositorio.lnec.pt/jspui/handle/123456789/1010928
Appears in Collections:DHA/NEC - Comunicações a congressos e artigos de revista

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