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- W2087423420 abstract "Seagrass blade dynamics were explored through numerical and laboratory experiments in order to improve parameterization of wave attenuation by submerged aquatic vegetation in the presence of a background current. In the numerical model, a single blade was modeled as a series of rigid plates attached by torsion springs. For the laboratory model, strips of low-density polyethylene were placed in a recirculating wave flume. A new form of the Keulegan—Carpenter number based on the horizontal excursion of the blade tip was found to be an excellent predictor of drag coefficient. An algebraic model for predicting wave attenuation was developed based on the following observations. During the portion of the wave period when the fluid velocities are highest, the blade motion is almost completely arrested and the vast majority of the turbulence production occurs during this time. Turbulence production when the blade is pronated is accurately predicted by the maximum fluid velocity over the wave period. The relative contribution to the total turbulence production over the wave period is determined by the relative strength of the waves and the current. Therefore, using a simple algebraic fit, the total depth-integrated, time-averaged turbulence production can be accurately predicted by two flow parameters: the maximum fluid velocity over the wave period, and a non-dimensional number that compares the wave and current velocities. By fitting the algebraic model to data from a particular site, it can be used to efficiently estimate wave attenuation and drag coefficient in seagrass exposed to waves with a background current." @default.
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- W2087423420 date "2014-01-01" @default.
- W2087423420 modified "2023-10-06" @default.
- W2087423420 title "Improved parameterization of seagrass blade dynamics and wave attenuation based on numerical and laboratory experiments" @default.
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- W2087423420 doi "https://doi.org/10.4319/lo.2014.59.1.0251" @default.
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