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The Influence of Wind Sea State on Wind Stress

Author: DingZuo
Tutor: GuanChangLong
School: Ocean University of China
Course: Fluid Mechanics
Keywords: Roughness Sea surface drag coefficient Wave steepness Wave age Charnock parameter Sea state
CLC: P731.2
Type: Master's thesis
Year: 2005
Downloads: 174
Quote: 7
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Abstract


Firstly, from the promotion of Charnock relationship logarithmic distribution of wind speed and Toba3 / 2 exponentially derived neutral conditions by the storms of the state of the sea surface drag coefficient with wind speed linear relationship between C d < / sub> = (0.78 0.475f (δ) U 10 ) × 10 -3 . Analysis found that the history of literature data and the Ocean University of China storms slots experimental measurement data as a wave of physical quantities that describe the wave state age due and dimensionless roughness exists a pseudo- correlation effects , thus this article with the sea ten meters height at the average wind speed U < sub> 10 , and replaced with a wave steepness wave age to parameterize the wind stress , with wave steepness δ trends by studying wave steepness function f (δ) to study the waves on the sea surface drag coefficient with wind speed changes the speed of modulation role . Of laboratory the storms slot data and historical literature data by fitting the derived the steepness function f (δ) of δ with wave steep trend f (δ) = Aδ B , wherein A = 0.13, B = -0.27, ie larger wave steepness , f (δ ) is smaller, the slower the change of the sea surface drag coefficient with wind speed ; Conversely , the smaller the wave steepness , f (δ) the greater sea surface drag coefficient with wind speed changes faster. This means that mature waves reflected on the sea surface roughness and wave age , more rough than the young waves , and Toba et al. (1990) consistent with the view .

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