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| Titel |
A weakly nonlinear model for multi-modal evolution of wind-generated long internal waves in a closed basin |
| VerfasserIn |
T. Sakai, L. G. Redekopp |
| 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 ; 16, no. 4 ; Nr. 16, no. 4 (2009-07-17), S.487-502 |
| Datensatznummer |
250013229
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| Publikation (Nr.) |
 copernicus.org/npg-16-487-2009.pdf |
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| Zusammenfassung |
| A weakly nonlinear evolution model that accounts for multi-modal
interaction in a small, continuously stratified lake of variable depth
is derived. In particular, an evolution model for the first two
vertical modes in a lake that is subject to wind stress forcing is
numerically simulated. Defining modal energies, energy transfer between
the first and the second vertical modes is calculated for several
different forms of the density stratification. Modal energy transfer
mainly occurs during reflection of mode-one waves at the vertical end
walls, and it is shown that the amount of energy transfer from the
first to the second mode is greatly dependent on the shape of the
stratification profile. Also, the initial modal energy partition at the
wind setup is shown to depend significantly on the penetration depth of
the internal shear stress induced by the wind stress, especially if the
stress distribution extends into the upper levels of the metalimnion. |
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