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| Titel |
On the cascade mechanism of short surface wave modulation |
| VerfasserIn |
M. Charnotskii, K. Naugolnykh, L. Ostrovsky, A. Smirnov |
| 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 ; 9, no. 3/4 ; Nr. 9, no. 3/4, S.281-288 |
| Datensatznummer |
250006542
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| Publikation (Nr.) |
 copernicus.org/npg-9-281-2002.pdf |
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| Zusammenfassung |
| Modulation of short
surface ripples by long surface or internal waves by a cascade mechanism
is considered. At the first stage, the orbital velocity of the long wave (LW)
adiabatically modulates an intermediate length nonlinear gravity wave (GW),
which generates a bound (parasitic) capillary wave (CW) near its crest in
a wide spatial frequency band. Due to strong dependence of the CW
amplitude on that of the GW, the resulting ripple modulation by LW can be
strong. Adiabatic modulation at the first stage is calculated for an
arbitrarily strong LW current. The CWs are calculated based on the Lonquet-Higgins
theory, in the framework of a steady periodic solution, which proves to be
sufficient for the cases considered. Theoretical results are compared with
data from laboratory experiments. A discussion of related sea clutter data
is given in the conclusion. |
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