摘要
本文分析了临泽防护林网内４０ｍ铁塔顶端以及化音戈壁滩上７８ｍ高处的大气湍流观测资料，得到了一些有意义的结果：（１）对稳定度比较接近的谱曲线进行对比，绿洲上空谱曲线的低频段较之戈壁上的衰减更快些。（２）假设湍流能量方程中的压力项和扩散项忽略不计，归一化后的湍能方程符合φｍ－ＺＬ＝φε戈壁滩上的结果较好地符合上述关系，但林网地区的φε值在中性情况下仅等于０５。通过上式计算证实其φｍ低于通常较光滑均一下垫面上的数值。
The paper analyses two sets of the turbulence structure data,which collected from the Oasis forest shelter-belt and Gobi desert areas near the Linze County The instruments were installed at the height of 40 m over the Oasis,and 7 8 m over the Gobi Through the intercomparison between these two sets of the data,following interesting results have been shown: (1) Under the close stability conditions,the spectral curves over the Oasis attenuate faster than the Gobi′s at low frequency portion (2) The values of φ ε over the forest shelter-belt are smaller than the Gobi′s,it approximates to 0 5 under the neutral condition If the flux divergence term and pressure term are neglected from the turbulent kinetic energy equation,we could write as φ ε=φ m-ZL The results over the Gobi show a good fitting with the formula If we take half of the ordinary φ m values under the various Z/L,the estimated φ ε shows a reliable fitting with above formula,except the extreme stable and extreme unstable conditions
出处
《高原气象》
CSCD
北大核心
1994年第3期291-298,共8页
Plateau Meteorology
关键词
绿洲
戈壁滩
近地面层
大气湍流
s: Surface layer turbulence structure
Turbulent kinetic energy equation
Anomaly of aerodynamic flux-gradient relationship
