Suchergebnisse

10 pages, 8 figures, 1 table ; We demonstrate the utility of using the equivalent bottom roughness for calculating the friction factor and the drag coefficient of a seagrass meadow for conditions in which the meadow height is small compared to the water depth. Wave attenuation induced by the seagrass Posidonia oceanica is evaluated using field data from bottom-mounted acoustic doppler velocimeters (ADVs). Using the data from one storm event, the equivalent bottom roughness is calculated for the meadow as ks ~ 0.40 m. This equivalent roughness is used to predict the wave friction factor ƒw, the drag coefficient on the plant, CD, and ultimately the wave attenuation for other storms. Root mean squared wave height (Hrms) is reduced by around 50% for incident waves of 1.1 m propagating over ~1000 m of a meadow of P. oceanica with shoot density of ~600 shoots m−2 ; E. Infantes acknowledges the financial support received from the Spanish Ministerio de Educacion y Ciencia, FPI scholarship program (BES-2006-12850). G. Simarro is supported by the Spanish government through the Ramón y Cajal program. A. Orfila and G. Simarro are grateful for financial support from Spanish MICINN through project CTM2010-12072. M. Luhar was supported on grant number 0751358 from the U.S. National Science Foundation Ocean Sciences Division ; Peer reviewed