Strong correlation between the drag coefficient and the shape of the wind sea spectrum over a broad range of wind speeds

Naohisa Takagaki, Satoru Komori*, Naoya Suzuki, Koji Iwano, Takenori Kuramoto, Satoshi Shimada, Ryoichi Kurose, Keiko Takahashi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)

Abstract

Momentum transfer across the wind-driven breaking air-water interface under strong wind conditions was experimentally investigated using a high-speed wind-wave tank together with field measurements at normal wind speeds. An eddy correlation method was utilized to measure roughness length and drag coefficient from wind velocity components measured by laser Doppler and phase Doppler anemometers. As a result, a new model for the roughness length and drag coefficient was proposed for predicting momentum transfer across the sea surface under both normal and strong wind conditions using the universal relationship between energy and significant frequency of wind waves normalized by the roughness length. The model shows that the roughness length and drag coefficient are uniquely determined at all wind speeds by energy and significant frequency of wind waves, and they can be given against U10 only from the measurements of the wave parameters and one-point mean air velocity in the logarithmic law region.

Original languageEnglish
Article numberL23604
JournalGeophysical Research Letters
Volume39
Issue number23
DOIs
Publication statusPublished - 2012 Dec 16
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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