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| Titel |
Internal-wave reflection from uniform slopes: higher harmonics and Coriolis effects |
| VerfasserIn |
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 ; 13, no. 3 ; Nr. 13, no. 3 (2006-07-06), S.265-273 |
| Datensatznummer |
250011770
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| Publikation (Nr.) |
 copernicus.org/npg-13-265-2006.pdf |
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| Zusammenfassung |
Weakly nonlinear reflection of internal waves from uniform slopes
produces higher harmonics and mean fields; the expressions are here
derived for constant stratification and with Coriolis effects fully
included, i.e. the horizontal component  of the earth
rotation vector (referred to as "non-traditional'') is taken into
account. Uniformity in one of the horizontal directions is
assumed. It is shown that solutions can be as readily derived with as
without ; hence there is no need to make the so-called
Traditional Approximation. Examples of reflecting internal-wave beams
are presented for super-inertial, inertial and sub-inertial
frequencies. The problem of resonant and non-resonant forcing of the
second harmonic is studied for single plane waves; unlike under the
Traditional Approximation, the problem of reflection from a horizontal
bottom no longer forms a singular case. Non-traditional effects are
favourable to resonant forcing at near-tidal rather than near-inertial
frequencies, and generally increase the intensity of the second
harmonic. Strong stratification tends to suppress non-traditional
effects, but a near-total suppression is only attained for high values
of stratification that are characteristic of the seasonal thermocline;
in most parts of the ocean, non-traditional effects can therefore be
expected to be important. |
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