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Spectral wave attenuation over Posidonia oceanica
Koftis, Th.K.; Prinos, P. (2011). Spectral wave attenuation over Posidonia oceanica, in: Valentine, E.M. et al. (Ed.) Proceedings of the 34th World Congress of the International Association for Hydro- Environment Research and Engineering: Balance and Uncertainty - 33rd Hydrology and Water Resources Symposium and 10th Conference on Hydraulics in Water Engineering , 26 June - 1 July 2011, Brisbane, Australia. pp. 935-942
In: Valentine, E.M. et al. (Ed.) (2011). Proceedings of the 34th World Congress of the International Association for Hydro- Environment Research and Engineering: Balance and Uncertainty - 33rd Hydrology and Water Resources Symposium and 10th Conference on Hydraulics in Water Engineering , 26 June - 1 July 2011, Brisbane, Australia. Engineers Australia: Brisbane. ISBN 978-0-85825-868-6. 1 CD-ROM (4583 pp.) pp., more

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Document type: Conference paper

Keywords
    Posidonia oceanica (Linnaeus) Delile, 1813 [WoRMS]; Marine
Author keywords
    seagrasses, P. Oceanica, wave attenuation, wave-vegetation interaction

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  • Innovative coastal technologies for safer European coasts in a changing climate, more

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  • Koftis, Th.K.
  • Prinos, P.

Abstract
    Coastal vegetation, such as sea grasses has the following functions regarding hydrodynamic aspects; wave attenuation, protection of the hinterland from wave attack, stabilizing the seabed. In this work an experimental study on wave energy dissipation and velocity structure over Posidonia Oceanica is performed, with P. Oceanica being the most abundant sea grass species in the Mediterranean Sea. Large scale experiments have been conducted in the CIEM flume for irregular intermediate water waves, for the investigation of wave attenuation related to the seagrass characteristics. Results show the efficient wave height attenuation, ranging from 15%-30%, depending on the seagrass characteristics; the seagrass submergence ratio (hs/D, hs=seagrass height, D=water depth) and its density (stems/m2). Wave attenuation increases with increasing plant density and submergence ratio and is obvious for all components of the wave spectra, especially at peak frequencies. Regarding the velocity field, it is shown that the velocities of the longer wave components are mostly attenuated compared to the short wave components. Also the results from the velocities measured at the edge of the seagrass meadow reveal the complicated velocity structure near the edge of the meadow, due to the nonlinear interaction of the wave motion and the movement of the leaves of the seagrasses.

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