This paper shows preliminary results of experimental measurements obtained in a large-scale wave flume under monochromatic waves plunging over a fixed bar. Velocity measurements have been obtained by means of both acoustic and optical instruments at 22 cross-shore locations ranging from the final part of the shoaling zone up to the inner surf zone. The measurements included the bottom boundary layer and the lower part of the water column and provided insights on the mean velocity distribution, turbulent velocity fluctuations and Reynolds stresses . The mean velocity is generally seaward directed. Magnitudes of the mean velocity are small in the shoaling region and increase above the bar crest, especially in the higher part of the water column, while magnitudes in the boundary layer are relatively small. Fluid from the inner surf zone is transported offshore by the undertow and pushed up near the shoreward face of the bar, thus partly feeding the onshore mass transport above trough level. This illustrates the occurrence of a large recirculation cell located just above the trough of the bar where currents and turbulent velocity fluctuations are strong.

Hydrodynamics under large-scale waves breaking over a barred beach

PIETRO, SCANDURA
;
CARLA, FARACI;
2018

Abstract

This paper shows preliminary results of experimental measurements obtained in a large-scale wave flume under monochromatic waves plunging over a fixed bar. Velocity measurements have been obtained by means of both acoustic and optical instruments at 22 cross-shore locations ranging from the final part of the shoaling zone up to the inner surf zone. The measurements included the bottom boundary layer and the lower part of the water column and provided insights on the mean velocity distribution, turbulent velocity fluctuations and Reynolds stresses . The mean velocity is generally seaward directed. Magnitudes of the mean velocity are small in the shoaling region and increase above the bar crest, especially in the higher part of the water column, while magnitudes in the boundary layer are relatively small. Fluid from the inner surf zone is transported offshore by the undertow and pushed up near the shoreward face of the bar, thus partly feeding the onshore mass transport above trough level. This illustrates the occurrence of a large recirculation cell located just above the trough of the bar where currents and turbulent velocity fluctuations are strong.
Breaking waves, surf zone, barred beach, turbulence, undertow.
File in questo prodotto:
File Dimensione Formato  
coastlab18_hybrid_experiments.pdf

non disponibili

Tipologia: Versione Editoriale (PDF)
Dimensione 1.23 MB
Formato Adobe PDF
1.23 MB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/358169
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact