STUDIES OF THE EFFECTS OF VARIATIONS IN BOUNDARY CONDITIONS ON THE ATMOSPHERIC BOUNDARY LAYER.
Annual rept., 63,
WISCONSIN UNIV MADISON
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TA FROM TWO CLASSICAL FLAT PLATE BOUNDARY LAYER EXPERIMENTS WERE USED TO DETERMINE VALUES OF Karmans constant through the approach of a limiting wall condition for an explicit function described by flow structure. The constant was found to vary with Reynolds numbers. A theoretical model of the atmospheric boundary layer was used to make a survey of the aerodynamic roughness of natural surfaces of the northern hemisphere and to compute the distribution and seasonal variations of geostrophic drag coefficients and energy dissipation. Temperature spectra were measured over an experimental field of bushel baskets set on the ice surface of Lake Mendota, and also over the natural ice surface. Comparison of the spectra showed the effects of turbulence generated by the field as a whole and by the spacing of the baskets. The experimental field of bushel baskets and a small artificial forest were used in studies of wind profile modification. Determinations were made of the effect of obstacle albedo and solar heating on momentum transfer and of the momentum budget over the artificial forest. Characteristic equations of katabatic flow for height-dependent eddy diffusivity were derived. Author