天津市郊大气边界层湍谱特征分析

SPECTRAL CHARACTERISTICS OF SURFACE-LAYER TURBULENCE OVER THE SUBURBS OF TIANJIN

中文关键词:  大气边界层  大气湍流  湍流谱

英文关键词:Atmospheric boundary layer  Atmospheric turbulence  Turbulence spectrum

中文摘要:

      用1990年7月在天津市郊的观测资料,计算了风速谱、温度谱及动量和热量通量的协谱。结果表明,市郊下垫面上的大气湍流谱特征与平坦地形上得到的典型结果基本一致,但满足各向同性的湍流尺度似乎比在平坦地形上的略大,谱的峰值频率区域略窄,谱的低频区(含能区)特征与平坦地形上的情况也不同。

英文摘要:

      The observational data of July. 1987 in the suburbs of Tianjin is used to compute the spectra of velocity, the spectra of temperature, the cospectra of velocity and temperature. The results show that the characteristics of the atmospheric turbulence spectra over the sub- urbs is basically in accordance with some typical results over the smooth terrain. But the scale, in which turbulence can obey the isotropic condition, over the suburbs is larger than over the smooth terrain. The spectrum peak frequency area is a bit narrow. The feature of the spectrum area in low frequency is out of accordance with that of the smqoth terrain either.