Evaluation of a spectral line width for the Phillips spectrum by means of numerical simulation

A. O. Korotkevich, Vladimir E Zakharov

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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<sup>-4</sup>, Phillips spectra ω<sup>-5</sup>, 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.

Original languageEnglish (US)
Pages (from-to)325-335
Number of pages11
JournalNonlinear Processes in Geophysics
Volume22
Issue number3
DOIs
StatePublished - May 28 2015

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spectral line width
Linewidth
Water waves
Kinetics
evaluation
Computer simulation
simulation
kinetic equations
water waves
water wave
kinetics
nonlinearity
line spectra
cascades
derivation
slopes

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Statistical and Nonlinear Physics

Cite this

Evaluation of a spectral line width for the Phillips spectrum by means of numerical simulation. / Korotkevich, A. O.; Zakharov, Vladimir E.

In: Nonlinear Processes in Geophysics, Vol. 22, No. 3, 28.05.2015, p. 325-335.

Research output: Contribution to journalArticle

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