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Wave Influences on Wind Energy Input into the Ekman Layer in the South China Sea

Author: YangZhongLiang
Tutor: WuKeJian
School: Ocean University of China
Course: Physical oceanography
Keywords: Ekman layer Wind energy input Wave energy input South China Sea
CLC: P731.22
Type: Master's thesis
Year: 2007
Downloads: 92
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Abstract


Velocity profile structure based on marine Ekman layer by wave impact point observed facts, study the mechanical energy of the waves on the Ekman layer input analytical expression for the wave energy input Ekman layer, under the assumption of constant eddy viscosity. The research results show that the ocean Ekman layer of mechanical energy input consists of two parts: First, the wind stress energy input directly on the Ekman layer, its impact by waves, can be expressed mathematically as E w = E w, 1 E w, 2 E w, 3 , the first of which does not consider wind energy input the wave impact Ekman layer, the second and The third term is the energy of wave induced entries, they wind stress wave characteristics and related to the angle between the direction of the wind and wave; two of the waves on the energy input of the Ekman layer, which can be mathematically expressed as E S = E S 1 E s, 2 E S, 3 , wherein, E S, 2 = -E w, 2 , E s, 3 = E w, 3 , the first associated with the wind stress and wave parameters can be directly regarded as the Coriolis-Stokes force rafting the work done on the wave-induced Stokes, second and third with wind stress, wave parameters, wave to the angle of the wind stress related. Maintain ocean mixed layer turbulence and dissipation of energy not only comes from the wind stress to the work done on the Ekman layer, also derived from the work done by the wave-induced Coriolis-Stokes force. Estimated the size of the wave energy input to the Ekman layer, results in high wind speed and high-latitude conditions, the wave energy input Ekman layer Ekman layer and does not consider the wave impact wind energy input compared to up to 10% in Circumpolar Current area of ??up to 20% or more; inconsistencies in the wave direction and the direction of the wind stress wave energy input is more significant. The the calculated wave unsteady Ekman layer energy input. The results of this paper has implications for research the effects of large-scale waves. Using the above theoretical results, the waves of the South China Sea Ekman layer wind energy input. Wind field taken from the resolution of 0. 5 × 0.5 QSCAT / NCEP satellite remote sensing data, the time from 2000 to 2005. First, the use of third-generation wave model calculated WAVEWATCH Ⅲ wave field distribution in the South China Sea, 2000-2005; then calculate the wind and wave energy input to the Ekman layer. The results show that the distribution of the waves of the South China Sea to the wind and waves except some marginal waters based, so you can basically ignore the waves caused by the wind direction and wave to the inconsistency of wind energy input. Wind stress energy input to the South China Sea around the island of Taiwan and the northern waters of the Philippine Islands, and other waters are smaller and more uniform distribution of wind energy input, and presents significant seasonal variation. Of the waves on the South China Sea Ekman layer the energy input is small, about 5% -10% of the approximately wind energy input. The Stokes drift acting purely by the Coriolis-Stokes force energy input E that s 1 Basic can be ignored, wave impact is mainly reflected in the the second E s, 2 . No waves impact of wind energy input of the South China Sea Ekman layer, Ekman layer is affected by the wave of wind energy input was reduced by about 5% -10%, and reduce the partial transformation of wave energy input to the Ekman layer. 2000-2005 the South China Sea, the wind and wave-induced energy input, wind and wave energy input to the Ekman layer has obvious seasonal variation, the downward trend in January-April, to the gradual increase in summer, to gradual increase in the fall to the winter growing trend. Seasonal changes in the South China Sea Ekman layer wind energy input and wave energy input depends on the seasonal variation of the wind.

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CLC: > Astronomy,Earth Sciences > Oceanography > Marine basic science > Marine hydrology > Ocean dynamics > Wave
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