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| Titel |
Numerical modelling of disintegration of basin-scale internal waves in a tank filled with stratified water |
| VerfasserIn |
N. Stashchuk, V. Vlasenko, K. Hutter |
| 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 ; 12, no. 6 ; Nr. 12, no. 6 (2005-11-09), S.955-964 |
| Datensatznummer |
250010898
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| Publikation (Nr.) |
 copernicus.org/npg-12-955-2005.pdf |
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| Zusammenfassung |
| We present the results of numerical experiments performed with the use of a
fully non-linear non-hydrostatic numerical model to study the baroclinic
response of a long narrow tank filled with stratified water to an initially
tilted interface. Upon release, the system starts to oscillate with an eigen
frequency corresponding to basin-scale baroclinic gravitational seiches.
Field observations suggest that the disintegration of basin-scale internal
waves into packets of solitary waves, shear instabilities, billows and spots
of mixed water are important mechanisms for the transfer of energy within
stratified lakes. Laboratory experiments performed by D. A. Horn, J. Imberger
and G. N. Ivey (JFM, 2001) reproduced several regimes, which include damped
linear waves and solitary waves. The generation of billows and shear
instabilities induced by the basin-scale wave was, however, not sufficiently
studied.
The developed numerical model computes a variety of flows, which were not
observed with the experimental set-up. In particular, the model results
showed that under conditions of low dissipation, the regimes of billows and
supercritical flows may transform into a solitary wave regime. The obtained
results can help in the interpretation of numerous observations of mixing
processes in real lakes. |
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