NDLI: The passing of long internal and external gravity wave over a step. Laboratory and in-situ measurements compared with analytical modelling

Content Provider	IEEE Xplore Digital Library
Author	Guizien, K. Ramirez, C. Barthelemy, E. Renouard, D.
Copyright Year	1998
Description	Author affiliation: LEGI, Univ. Joseph Fourier, Grenoble, France (Guizien, K.)
Abstract	Within the MORSE project of the CEC-MASTIII, LEGI investigates the interaction of long gravity waves with the continental shelf. It is well known that internal tides are primarily generated at these dramatic topographic features. Propagating onshelf they desintegrate to "shed" solitary waves and highly nonlinear waves that very often give signatures on SAR images of the ocean surface. Moreover off-shore operators have shown recent concern in predicting internal wave fields that they regard as hazards. The present authors analyze the generation and the refraction of these long waves. They extend the shallow water model for linear long waves devised by Rattray (1960), which accounts for the stratification of the ocean water column (2-layer), for the earth rotation (f-plane approximation), for free surface boundary conditions, to take into account the oblicity of the wave crest with respect to the shelf break (modelled as a step shelf). The long wave assumption implies that the pressure on the vertical is hydrostatic. The horizontal component of the velocity is much larger than the vertical one due to the shallow water assumption. The equations reduce to vertically integrated (in each layer) 2D equations for the 2 horizontal velocity components, the interface displacement and free surface one. This system of equation yields for instance Poincare waves, Kelvin waves and standing waves for the 2 modes sustained by the two layer stratification. Long wave models of this type have been shown to be limited to the description of wave propagation on short time scales. The results of the model are used to describe how an internal solitary waves is refracted by a step and how internal tides are generated at the shelf break by an incoming surface tide modelled as a free Poincare wave.
Starting Page	866
Ending Page	870
File Size	456528
Page Count	5
File Format	PDF
ISBN	0780350456
DOI	10.1109/OCEANS.1998.724362
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-09-28
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gravity Sea surface Surface topography Tides Surface waves Equations Oceans Hazards Earth Boundary conditions
Content Type	Text
Resource Type	Article

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