The Critical Richardson Number.
Research and development technical rept.,
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
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The Obukhov dynamic similarity of flows hypothesis for the surface boundary layer of the atmosphere has been reevaluated with respect to an arbitrary variable rather than a constant in the diabatic influence function. A literature search revealed that estimates of the so-called constant beta ranged from 0.6 beta 17, suggesting that beta was indeed a variable. Analysis of 103 wind and temperature profiles extracted from the literature led to the conclusion that no constant exists for the log plus linear profile form for thermally stratified stable flow and that the critical value of the gradient Richardson number is unity. Author