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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Monin–Obukhov length ： ウィキペディア英語版 Monin–Obukhov length The (Obukhov length ) is used to describe the effects of buoyancy on turbulent flows, particularly in the lower tenth of the atmospheric boundary layer. It was first defined by Alexander Obukhov in 1946. It is also known as the Monin–Obukhov length because of its important role in the similarity theory developed by Monin and Obukhov. The Obukhov length is defined by :$$ L = - \frac\ where $u\_$ * is the frictional velocity, $\backslash bar\backslash theta\_v$ is the mean virtual potential temperature, $(\backslash overline)\_s$ is the surface virtual potential temperature flux, k is the von Kármán constant. The virtual potential temperature flux is given by :$$ \overline =\overline +0.61\overline\; \overline where $\backslash theta$ is potential temperature, $\backslash overline$ is absolute temperature and $q$ is specific humidity. By this definition, $L$ is usually negative in the daytime since $\backslash overline$ is typically positive during the daytime over land, positive at night when $\backslash overline$ is typically negative, and becomes infinite at dawn and dusk when $\backslash overline$ passes through zero. A physical interpretation of $L$ is given by the Monin–Obukhov similarity theory. During the day $-L$ it is the height at which the buoyant production of turbulence kinetic energy (TKE) is equal to that produced by the shearing action of the wind (shear production of TKE). ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Monin–Obukhov length」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.