对流层下部的湍流微結构

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。

MICROSTRUCTURE OF TURBULENCE IN THE LOWER TROPOSPHERE

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.