Wind Profiles, Spectra, and Cross-Spectra over Homogeneous Terrain

摘要

Cospectra and quadrature spectra of wind components observed simultaneously at two levels are most easily predicted by using the coherence and the eddy slope. Analysis of White Sands data confirms the hypothesis that the latter quantities are simply related to the Richardson number. A theory is presented that makes possible the prediction of one dimensional spectra up to wavelengths several times the height. A test of the theory at White Sands gave good results. The logical basis for the similarity theory of the flow in the planetary boundary layer is examined in detail. The scaling principles developed here are applied to momentum exchange and verified tentatively by analysis of a composite set of wind observations at O'Neill, Nebraska. (Author)