对流层下部的湍流微結构

MICROSTRUCTURE OF TURBULENCE IN THE LOWER TROPOSPHERE

中文摘要:

      本文利用等人的风速模涨落的观測資料,分析了100—1470米高的湍流結构。得到下面主要結果:(1)各个高度上水平风速模涨落的概率分布近于正态律.(2)局地各向同性湍流理論的結論适用于所述高度范围內的小湍涡区.并且,在几百米高度以下,結构函数适合“2/3規律”的最大尺度常常与高度相当,甚至会超过高度好多倍.(3)在高于几百米的地方,适合“2/3規律”的最大尺度小于高度,且随高度沒有呈現系統性变化。文中也討論了所用記录的代表性。

英文摘要:

      In this paper, the experimental data of the horizontal wind speed fluctuations at different heights from 100 to 1470 meters given by Deveatova are analysed. The main results are:1. The horizontal wind speed fluctuations at any height may be approximated by a Gaussian distribution. 2. For at a height no more than few hundred meters the well-known "2/3 law" is hold within a length scale comparable to or-several time larger than the height:3. At higher levels, the scale range in which the "2/3 law" holds good, is usually less than the height itself and no definite relationship between this scale range and the height has been found. The representativeness-of the data is also discussed.