流体物理学ゼミナール2005/01/13

本年最初のセミナーの案内をお送りします。
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_/ 流体力学セミナー 2004 No. 11
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_/ 日 時 : 05年 1月 17日 (月) 15:00〜16:30
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_/ 場 所 : 京大数理研 009号室
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_/ 講 師 : Dongliang Zhao (趙 棟梁) 氏
_/ (京大大学院工学研究科/中国海洋大学物理海洋研究所)
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_/ 題 目 : 風波とLangmuir循環による海洋混合層の変動
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_/ 内 容 :
_/ The oceanic mixed layer refers to the upper layer of the ocean that is
_/ in direct contact with the atmosphere and is usually observed to be mixed
_/ thoroughly by turbulent mixing. Models of the oceanic mixed layer usually
_/ ignore the presence of wind waves at the air-sea interface, and assumed
_/ they obey the law of the wall, in which the turbulence is equilibrated
_/ between shear production and dissipation. However, wind waves are at least
_/ important for two reasons. First, wave breaking transfers wave energy into
_/ turbulence and is thus an energy source for boundary layer turbulence.
_/ Second, direct interactions between Stokes drift that is resulted from
_/ wind waves and wind-driven current can produce Langmuir circulation,
_/ which has the capability to transport suspended matter vertically downward
_/ deep into the oceanic mixed layer and modifying the circulation and
_/ turbulence characteristics in the upper ocean layer.
_/ I will first introduce the wind wave models briefly, and suggest that
_/ wind wave forecast has been well developed compared to the other ocean
_/ environmental factor predictions. Then, based on a second order turbulent
_/ closure scheme, Mellor-Yamada model, the influence of wind waves on
_/ oceanic mixed layer is investigated from three aspects including air-sea
_/ flux algorithms, turbulence induced by wave breaking, and Langmuir
_/ circulation, all of them depend on the development degree
_/ of wind waves. The detail will be reported at the presentation.
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_/ 備考:講師は機械工学専攻流体工学 小森研究室に滞在中です。
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世話人:大木谷 耕司(京大数研)、藤 定義(京大理)、松本 剛(京大理)、
山田 道夫(京大数研)
アドバイザー:河原 源太(京大工)、小森 悟(京大工)、藤坂博一(京大情報学)、
船越 満明(京大情報学)、水島 二郎(同志社大工)、余田 成男(京大理)
連絡先:ohkitani@kurims.kyoto-u.ac.jp
メールリスト連絡先: semi-adm@kyoryu.scphys.kyoto-u.ac.jp