Print Email Facebook Twitter Low frequency wave resonance in fringing reef environments Title Low frequency wave resonance in fringing reef environments Author Pomeroy, A.W.M. van Dongeren, A. Lowe, R.J. Van Thiel de Vries, J.S.M. Roelvink, J.A. Faculty Civil Engineering and Geosciences Department Hydraulic Engineering Date 2012-12-31 Abstract Low frequency wave resonance has been postulated to enhance damage to coral reef protected coastlines during storm events. This paper uses the numerical model XBeach to examine the dynamics that contribute to resonance that have been previously observed on a fringing reef on Guam during tropical storm Man-Yi (Péquignet et al., 2009). The methods to identify resonance in numerical (or field data) are comprehensively reviewed with three indicators of resonance proposed based upon data obtained at two locations in the model domain: 1. The water surface elevation must be highly coherent, 2. The phase difference must (closely) correspond to 0° or 180°, and 3. Amplification of the signal must be observed between the reef crest and the shoreline. XBeach simulations demonstrated that resonance could be reproduced under ‘normal’ wave conditions, but only when bottom friction was minimal and hence values that were atypically low for coral reefs. However, under tropical storm Man-Yi conditions, resonance was reproduced with reasonable bottom friction values. A sensitivity analysis demonstrated that, although the frequency associated with resonance was not affected by the choice of bottom friction coefficients, the magnitude of the amplification was significantly affected. Ongoing research is being undertaken to investigate the resonant response for a wider variety of reef morphologies and incident wave forcing conditions. Subject low-frequency waves, coral reefs, fringing reefs, resonance To reference this document use: http://resolver.tudelft.nl/uuid:4f982877-618f-40ce-a3c0-05e3622e2131 Publisher Coastal Engineering Research Council ISSN 2156-1028 Source ICCE 2012: Proceedings of the 33rd International Conference on Coastal Engineering, Santander, Spain, 1-6 July 2012 Part of collection Institutional Repository Document type conference paper Rights (c) 2012 The Authors Files PDF 291116.pdf 371.57 KB Close viewer /islandora/object/uuid:4f982877-618f-40ce-a3c0-05e3622e2131/datastream/OBJ/view