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Generation of Weakly Nonlinear Nonhydrostatic Internal Tides Over Large Topography: a Multi-modal Approach : Volume 15, Issue 2 (07/03/2008)

By Maugé, R.

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Book Id: WPLBN0003987215
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: Generation of Weakly Nonlinear Nonhydrostatic Internal Tides Over Large Topography: a Multi-modal Approach : Volume 15, Issue 2 (07/03/2008)  
Author: Maugé, R.
Volume: Vol. 15, Issue 2
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2008
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Gerkema, T., & Maugé, R. (2008). Generation of Weakly Nonlinear Nonhydrostatic Internal Tides Over Large Topography: a Multi-modal Approach : Volume 15, Issue 2 (07/03/2008). Retrieved from http://hawaiilibrary.net/


Description
Description: Laboratoire de Physique des Océans, Université de Bretagne Occidentale, 6 avenue Le Gorgeu, 29238 Brest, France. A set of evolution equations is derived for the modal coefficients in a weakly nonlinear nonhydrostatic internal-tide generation problem. The equations allow for the presence of large-amplitude topography, e.g. a continental slope, which is formally assumed to have a length scale much larger than that of the internal tide. However, comparison with results from more sophisticated numerical models show that this restriction can in practice be relaxed. It is shown that a topographically induced coupling between modes occurs that is distinct from nonlinear coupling. Nonlinear effects include the generation of higher harmonics by reflection from boundaries, i.e. steeper tidal beams at frequencies that are multiples of the basic tidal frequency. With a seasonal thermocline included, the model is capable of reproducing the phenomenon of local generation of internal solitary waves by a tidal beam impinging on the seasonal thermocline.

Summary
Generation of weakly nonlinear nonhydrostatic internal tides over large topography: a multi-modal approach

Excerpt
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