Application of Mixed-Layer Similarity to the Observed Dispersion from a Ground-Level Source

F. T. M. Nieuwstadt Royal Netherlands Meteorological Institute, De Bilt, The Netherlands

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Abstract

The laboratory experiments of Deardorff and Willis have shown that the dispersion from a low-level source under convective conditions follows mixed-layer similarity. The convective runs of the Prairie Grass dispersion experiment are reanalyzed in this paper. It turns out that mixed-layer similarity scaling also works well for this classic field experiment. The observed cross-wind-integrated concentration closely matches the laboratory results. The observed lateral dispersion coefficients are somewhat larger than those given by Deardorff and Willis.

Abstract

The laboratory experiments of Deardorff and Willis have shown that the dispersion from a low-level source under convective conditions follows mixed-layer similarity. The convective runs of the Prairie Grass dispersion experiment are reanalyzed in this paper. It turns out that mixed-layer similarity scaling also works well for this classic field experiment. The observed cross-wind-integrated concentration closely matches the laboratory results. The observed lateral dispersion coefficients are somewhat larger than those given by Deardorff and Willis.

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