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Bottom pressure distribution due to wave scattering near a submerged obstacle

Published online by Cambridge University Press:  07 June 2012

Julien Touboul  and
Vincent Rey
Julien Touboul*
Affiliation:
Mediterranean Institute of Oceanography (MIO), Aix-Marseille Univ, Université du Sud Toulon-Var, CNRS/INSU, MIO UMR 7294, IRD, MIO UMR235, 83957, La Garde CEDEX, France
Vincent Rey
Affiliation:
Mediterranean Institute of Oceanography (MIO), Aix-Marseille Univ, Université du Sud Toulon-Var, CNRS/INSU, MIO UMR 7294, IRD, MIO UMR235, 83957, La Garde CEDEX, France
*
†Email address for correspondence: [email protected]
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Abstract

The dynamic pressure distribution on the bottom of a wave flume, due to the interaction of water waves with a submerged structure, is investigated experimentally and analytically, for both first- and second-order gravity waves of finite amplitude. The dynamic pressure excess is found to be very important, even for incoming waves propagating in deep water conditions. In this depth condition, a high pressure zone, thirty times larger than the dynamic pressure excess expected in the absence of the obstacle, is found in its vicinity. On the other hand, a low pressure zone is observed in the vicinity of the submerged obstacle for incoming waves propagating in smaller depth conditions. In any case, pressure gradients remain important. The second-order disturbance is found to be larger than first order in deep water conditions, for some specific conditions and locations. This result is interpreted in terms of nonlinear coupling of first-order components, including local modes.

JFM classification

Geophysical and Geological Flows: Coastal engineering
Type
Papers
Information
Journal of Fluid Mechanics , Volume 702 , 10 July 2012 , pp. 444 - 459
Copyright
Copyright © Cambridge University Press 2012

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