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| Titel |
Generation of second mode solitary waves by the interaction of a first mode soliton with a sill |
| VerfasserIn |
V. I. 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 ; 8, no. 4/5 ; Nr. 8, no. 4/5, S.223-239 |
| Datensatznummer |
250005296
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| Publikation (Nr.) |
 copernicus.org/npg-8-223-2001.pdf |
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| Zusammenfassung |
| Results of an
experimental and theoretical study of the interaction of a first mode
internal solitary wave with a localised bottom topography (sill) are
presented. Laboratory experiments have been performed in a 10m long and
0.33m wide channel filled with a stratified fluid. The interface between
the two layers (fresh and salt water) is diffuse and has a finite
thickness. Soliton-type disturbances of the interface having
characteristics of the first baroclinic mode are generated at one channel
end. They move along the channel and encounter an underwater obstacle
(sill) in the middle of the channel, where they break into reflected and
transmitted waves. Two types of internal waves are produced by the
interaction: a fast first mode internal soliton and a slower (by a factor
of approximately 3) second mode soliton-like wave. A numerical model,
based on the two-dimensional Navier-Stokes equations in the Boussinesq
approximation, is used tore produce the laboratory experiment. The
detailed analysis of the horizontal and vertical structures of transmitted
and reflected waves showed that the fast reflected and transmitted waves
observed in the experiment can be interpreted as a first mode internal
solitary wave whose characteristics are very close to those of the K-dV
solitons. It is also demonstrated that the slow speed waves, generated
during the interaction behind the first fast wave have vertical and
horizontal structures very close to the second mode internal K-dV solitons. |
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