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| Titel |
Evaluation of a spectral line width for the Phillips spectrum by means of numerical simulation |
| VerfasserIn |
A. O. Korotkevich, V. E. Zakharov |
| 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 ; 22, no. 3 ; Nr. 22, no. 3 (2015-05-28), S.325-335 |
| Datensatznummer |
250120983
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| Publikation (Nr.) |
 copernicus.org/npg-22-325-2015.pdf |
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| Zusammenfassung |
| The work aims to check one of the assumptions under which the kinetic equation for water waves
was derived in order to understand whether it can be applied to the
situations described by the Phillips spectrum. We evaluate a spectral line
width of the spectrum from the simulations in the framework of primordial
dynamical equations at different levels of nonlinearity in the system,
corresponding to the weakly turbulent Kolmogorov–Zakharov spectra
ω−4, Phillips spectra ω−5, and intermediate cases. The
original motivation of the work was to check one of the assumptions under
which the kinetic equation for water waves was derived in order to understand
whether it can be applied to the Phillips spectrum. It is shown that, even in
the case of relatively high average steepness, when the Phillips spectrum is
present in the system, the spectral lines are still very narrow, at least in
the region of the direct cascade spectrum. It allows us to state that, even
in the case of the Phillips spectrum, one of the assumptions used for the
derivation of the Hasselmann kinetic equation is still valid, at least in the
case of moderate whitecapping. |
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