Surface current effects on the fetch-limited growth of wave energy

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

To study the fetch-limited growth of wind wave energy over a region with significant lateral shear of the current field, this study exploited data obtained from two linear phased-array High Frequency (HF) radar systems. Both the near-surface currents and wave energy and period were mapped over the highly sheared inshore boundary of the Florida Current. The wave energy growth during two periods when the winds were steady for > 12 hours and were directed offshore was computed over a range of fetches from 5 to 45 km. The observed energy growth rates were significantly (∼50 %) lower than predicted by the Donelan et al. (1992) empirical formulation over the high vorticity region. The reduced growth rate was consistent with a shift of the wind stress direction into the current direction due to refraction of the wave field. Dimensionless wave energy increased by as much as 100% over neighboring values when the vertical component of the surface current vorticity was a global minimum. While trapping and enhancement of wave energy is predicted by wave ray theory, it has never before been confirmed within the Florida Current with coincident wave and current measurements.

Original languageEnglish (US)
Article numberC03003
JournalJournal of Geophysical Research C: Oceans
Volume112
Issue number3
DOIs
StatePublished - Mar 8 2007

Fingerprint

fetch
wave energy
vorticity
energy
Vorticity
wind wave
wave field
wind stress
refraction
trapping
Wind stress
effect
radar
phased arrays
Electric current measurement
linear arrays
Radar systems
Refraction
rays
shear

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

Surface current effects on the fetch-limited growth of wave energy. / Haus, Brian K.

In: Journal of Geophysical Research C: Oceans, Vol. 112, No. 3, C03003, 08.03.2007.

Research output: Contribution to journalArticle

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