Wave Attenuation by Vegetation
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 119, Issue 1
Abstract
The vertically two‐dimensional problem of small‐amplitude waves propagating over submerged vegetation is formulated using the continuity and linearized momentum equations for the regions above and within the vegetation. The effects of the vegetation on the flow field are assumed to be expressible in terms of the drag force acting on the vegetation. An analytical solution is obtained for the monochromatic wave whose height decays exponentially. The expressions for the wave number and the exponential decay coefficient derived for arbitrary damping are shown to reduce to those based on linear wave theory and the conservation equation of energy if the damping is small. The analytical solution is compared with 60 test runs conducted using deeply submerged artificial kelp. The calibrated drag coefficients for these runs are found to vary in a wide range and appear to be affected by the kelp motion and viscous effects that are neglected in the analysis. The analytical solution is also shown to be applicable to subaerial vegetation, which is predicted to be much more effective in dissipating wave energy.
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Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 119 • Issue 1 • January 1993
Pages: 30 - 48
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Jul 8, 1992
Published online: Jan 1, 1993
Published in print: Jan 1993
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