Horizontal coherence of wind fluctuations |
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| Authors: | C F Ropelewski H Tennekes H A Panofsky |
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| Institution: | (1) The Pennsylvania State University, 16802 University Park, Penn., U.S.A. |
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| Abstract: | The coherence for streamwise and cross-stream wind components is studied at four meteorological sites and compared with a
representative wind-tunnel experiment. The coherence is approximated by a negative exponential in terms of a non-dimensional
frequency, Δf and a decay parameter, a. Theoretical guidelines are developing to aid in identifying the pertinent variables affecting the decay parameters. These
theoretical discussions indicate that for longitudinal separations, both the streamwise and cross-stream decay parameters
are functions of roughness; the cross-stream decay parameter is a strong function of stability while the streamwise component
is not. For lateral separations, it is found that both the streamwise and cross-stream decay parameters are functions of stability.
Isopleths of the decay parameter are drawn on graphs with coordinates of angle and Richardson number for both the streamwise
and cross-stream decay parameters of coherence. These empirical curves give an indication of the behavior of the decay parameters
of coherence for a range of stabilities given by -0.9<Ri<0.08, and a range of angles between zero and ninety degrees.
Department of Meteorology.
Department of Aerospace Engineering. |
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