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| Titel |
Generation of weakly nonlinear nonhydrostatic internal tides over large topography: a multi-modal approach |
| VerfasserIn |
R. Maugé, T. Gerkema |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 15, no. 2 ; Nr. 15, no. 2 (2008-03-07), S.233-244 |
| Datensatznummer |
250012612
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| Publikation (Nr.) |
 copernicus.org/npg-15-233-2008.pdf |
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| Zusammenfassung |
| 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. |
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