Maximum and Zero Reflection from Submerged Plate
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 110, Issue 2
Abstract
Wave reflection from a submerged horizontal plate in shallow water varies with the plate width to wavelength ratio and the submergence depth ratio. For a particular submergence, the reflection coefficient increases alternately to a peak value and then decreases to zero. The conditions for these maxima and zero reflections can be explained by examining the energy fluxes across the fluid regions around the plate. The total reflection consists of three components; those reflected from each end and that beneath the plate. The underflow is governed by the pressure difference between the two ends and can be either in a seaward or shoreward direction depending on the plate width to wavelength ratio. Superposition of reflections from the two edges can be additive or subtractive as their phases differ. The additive interference, reinforced by the seaward energy flux beneath the plate, produces the maximum reflection. On the other hand, when the two end reflections are out of phase and the energy flux beneath the plate is zero or shoreward, the incident wave energy is fully transmitted to the lee side.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 110 • Issue 2 • May 1984
Pages: 171 - 181
Copyright
Copyright © 1984 ASCE.
History
Published online: May 1, 1984
Published in print: May 1984
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