Limited fetch revisited: Comparison of wind input terms, in surface wave modeling

Andrei Pushkarev, Vladimir E Zakharov

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Results pertaining to numerical solutions of the Hasselmann kinetic equation (HE), for wind driven sea spectra, in the fetch limited geometry, are presented. Five versions of source functions, including the recently introduced ZRP model (Zakharov et al., 2012), have been studied, for the exact expression of Snl and high-frequency implicit dissipation, due to wave-breaking. Four of the five experiments were done in the absence of spectral peak dissipation for various Sin terms. They demonstrated the dominance of quadruplet wave-wave interaction, in the energy balance, and the formation of self-similar regimes, of unlimited wave energy growth, along the fetch. Between them was the ZRP model, which strongly agreed with dozens of field observations performed in the seas and lakes, since 1947. The fifth, the WAM3 wind input term experiment, used additional spectral peak dissipation and reproduced the results of a previous, similar, numerical simulation described in Komen et al. (1994), but only supported the field experiments for moderate fetches, demonstrating a total energy saturation at half of that of the Pierson-Moscowits limit. The alternative framework for HE numerical simulation is proposed, along with a set of tests, allowing one to select physically-justified source terms.

Original languageEnglish (US)
JournalOcean Modelling
DOIs
Publication statusAccepted/In press - Feb 21 2015

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Keywords

  • Hasselmann equation
  • Kolmogorov-Zakharov spectra
  • Nonlinear interaction
  • Self-similar solutions
  • Wave-breaking dissipation
  • Wind-wave interaction

ASJC Scopus subject areas

  • Atmospheric Science
  • Oceanography
  • Geotechnical Engineering and Engineering Geology
  • Computer Science (miscellaneous)

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