MODELLING INFRAGRAVITY WAVES AND CURRENTS ACROSS A FRINGING CORAL REEF
No. 33 (2012), Swash, Nearshore Currents, and Long Waves
No. 33 (2012)

MODELLING INFRAGRAVITY WAVES AND CURRENTS ACROSS A FRINGING CORAL REEF

Swash, Nearshore Currents, and Long Waves
https://doi.org/10.9753/icce.v33.currents.29
Published 2012-12-15
  • Ap Van Dongeren
  • Ryan Lowe
  • Andrew Pomeroy
  • Trang Minh Duong
  • Dano Roelvink
  • Graham Symonds
  • Roshanka Ranasinghe
Ap Van Dongeren
Ryan Lowe
Andrew Pomeroy
Trang Minh Duong
Dano Roelvink
Graham Symonds
Roshanka Ranasinghe
ICCE 2012 Cover Image
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Keywords

fringing coral reefs
hydrodynamics
wave breaking
infragravity waves
low frequency waves
surfbeat
XBeach

How to Cite

Van Dongeren, A., Lowe, R., Pomeroy, A., Duong, T. M., Roelvink, D., Symonds, G., & Ranasinghe, R. (2012). MODELLING INFRAGRAVITY WAVES AND CURRENTS ACROSS A FRINGING CORAL REEF. Coastal Engineering Proceedings, 1(33), currents.29. https://doi.org/10.9753/icce.v33.currents.29
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Abstract

Low-frequency (infragravity) wave dynamics on a fringing coral reef were investigated using the numerical model XBeach (Roelvink et al, 2009). First, the skill of the one-dimensional model was evaluated based on its predictions of short waves (0.04-0.2 Hz), infragravity waves (0.004-0.04 Hz) and water level measurements (tidal and wave setup) obtained during a 2009 field study at Ningaloo Reef in Western Australia. The model calibration was sensitive to friction coefficients for short waves and current / infragravity bed friction, which were assumed independent in this model study. The infragravity waves were found to be generated primarily in the surf zone through the breakpoint generation mechanism rather than through offshore forcing. The infragravity waves were strongly also modulated over the reef by tidal depth variations, primarily due to the variability in frictional dissipation rates when the total water depth over the reef varied. The results reveal that short waves dominated bottom stresses on the fore reef and near the reef crest; however, inside the lagoon, infragravity waves become increasingly dominant, accounting up to 50% of the combined bottom stresses
https://doi.org/10.9753/icce.v33.currents.29
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