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Title: Strong correlation between the drag coefficient and the shape of the wind sea spectrum over a broad range of wind speeds
Authors: Takagaki, Naohisa
Komori, Satoru
Suzuki, Naoya
Iwano, Koji
Kuramoto, Takenori
Shimada, Satoshi
Kurose, Ryoichi  kyouindb  KAKEN_id
Takahashi, Keiko
Keywords: air-sea interaction
drag coefficient
local equilibrium law
roughness length
tropical cyclone
wind waves
Issue Date: Dec-2012
Publisher: American Geophysical Union
Journal title: Geophysical Research Letters
Volume: 39
Issue: 23
Thesis number: L23604
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 againstU10only from the measurements of the wave parameters and one-point mean air velocity in the logarithmic law region.
Rights: ©2012. American Geophysical Union.
DOI(Published Version): 10.1029/2012gl053988
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