Similarity forms for ground-source surface-layer diffusion |
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| Authors: | Gary A Briggs |
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| Institution: | (1) Meteorology and Assessment Division, Environmental Sciences Research Laboratory, U.S. Environmental Protection Agency, 27711 Research Triangle Park, NC, USA |
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| Abstract: | Past work on analyzing ground-source diffusion data in terms of surface-layer similarity theory is reviewed; these analyses assume that 
z
/L orh/L is a function of u
*
x/ L (where h = Q/   dy). It is argued that an alternative scaling, h
*/L versus x/L, is nearly as universal in that it is very weakly influenced by surface roughness, except for a modest influence in the free convective case (h
* = Q/u
* dy); the advantage of this scaling is that it eliminates the need to reassess as vertical diffusion progresses. The Prairie Grass data set is adjusted for the difference in source and sampling heights, and is plotted with this scaling. Simple analytic equations are suggested that fit the resultant data plots for stable and unstable conditions, and suggestions are made towards practical application of these results.On assignment from the National Oceanic and Atmospheric Administration, U.S. Department of Commerce. |
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| Keywords: | |
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