Experimental Development of the Predictive Relations for the Eddy Exchange Coefficients for Momentum and Heat in the Atmospheric Boundary Layer.
Research and development Technical rept.,
TEXAS A AND M RESEARCH FOUNDATION COLLEGE STATION
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D, GRAPHICSAIR WATER INTERACTIONS, ATMOSPHERES, BOUNDARY LAYER, THEMIS PROJECTDirect measurements of the eddy fluxes of momentum and heat were made in the atmospheric boundary layer simultaneously with measurements of the profiles of average wind velocity and temperature to evaluate the capability for functional definition of the eddy exchange coefficients in terms of the mean parameters. The eddy exchange coefficients for both momentum and heat, K sub m and K sub h, respectively, were found to depend strongly on atmospheric stability, both increasing with instability. K sub m was found to increase with increasing wind velocity, while no such relation was noted for K sub h. Thus, as expected, but contrary to many earlier investigations based on mean measurements alone, the assumption of constancy of K sub m and K sub h or their ratio is not substantiated. Several postulated functional forms for K sub m and K sub h were investigated and quantitatively assessed. Author