Resumen
Designing optimized coastal structures on islands bordered by coral reefs has proven to be a challenging task due to the complex reef and wave interaction (Jensen, 1991; Jensen, Sloth and Jacobsen, 1998). Often the reefs in these tropical regions have a steep seaward profile until a certain depth, whereafter the reef suddenly becomes flat with a mild slope. When offshore waves reach the reef, it can result in plunging wave breaking, a wave set-up, and energy transfer from the peak frequency to lower frequencies resulting in long period wave motions. Under these conditions, it is difficult to predict the rate of overtopping as the complex hydrodynamics are not covered in standard overtopping formulas. Furthermore, the standard spectral wave models, on which the overtopping formulas often are based, cannot describe the transformation of offshore waves over the reef as the models are not able to resolve the physics of this violent water motion. In connection with the hydraulic study for a detailed design of a revetment on Fuvahmulah in the Maldives, the OpenFOAM CFD model is applied to obtain the hydrodynamic design parameters. The wave dynamics on the reef, the revetment overtopping rates, and hydrodynamic forces derived from the numerical model are compared with results from a physical model conducted by the Danish Hydraulic Institute (DHI).Referencias
Jensen (1991). Waves on Coral Reefs. Long Beach, Calif.: Costal and Ocean Management.
Jensen, Sloth and Jacobsen (1998). Wave Dynamics and Revetment Design on a Natural Reef. Coastal Engineering, 1138-1151.
Liu, Li, Liao and Liu (2021) Physical and numerical modeling of random wave transformation and overtopping on reef topography, Ocean Engineering, Volume 220
Lowe, Altomare, Buckley, da Silva, Hansen, Rijnsdorp, Domínguez and Crespo (2022) Smoothed Particle Hydrodynamics simulations of reef surf zone processes driven by plunging irregular waves, Ocean Modelling, Volume 171
OpenFOAM (n.d.). https://www.openfoam.com Waves2Foam (n.d.). https://openfoamwiki.net/index.php/Contrib/waves2Foam
Yao, Chen, Xu, Jia and Jiang (2022), Numerical modelling of wave transformation and runup over rough fringing reefs using VARANS equations, Applied Ocean Research, Volume 118
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Derechos de autor 2023 Villy L. Mik-Meyer, Signe Schløer, Tony Erik Bergøe