Spectral Characteristics of Surface-Layer Turbulence
AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA
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The behaviour of spectra and cospectra of turbulence in the surface layer is described within the framework of similarity theory using wind and temperature fluctuation data obtained in the 1968 AFCRL Kansas experiments. With appropriate normalization, and spectra and cospectra are each reduced to a family of curves which spread out according to zL at low frequencies but converge to a single universal curve in the intertial subrange. The paper compares these results with data obtained by other investigators over both land and water. Spectral constants for velocity and temperature are determined and the variability in the recent estimates of the constants is discussed.
- Atmospheric Physics