Abstract
A statistical diffusion model is used to estimate the variation of σy and σz with height in daytime conditions. The existing literature is reviewed, showing inconsistencies among the few field data. The statistical Monte Carlo-type model is described in detail and some asymptotic predictions of the theory are outlined. For example, the usefulness of the formulas σy = σ θ x and σz = σe x are shown, where and σθ σe are the standard deviations of the horizontal and vertical wind directions.
Results of the model show that σy varies little with release height in daytime conditions, but that it can depart significantly from the standard Pasquill-Gifford-Turner (PGT) curves for roughnesses outside their range of derivation. The vertical component σz typically increases by a factor of two as heights increase, from the surface layer to mid-planetary boundary layer height.
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© 1981 Plenum Press, New York
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Hanna, S.R. (1981). Effects of Release Height on σy and σz in Daytime Conditions. In: De Wispelaere, C. (eds) Air Pollution Modeling and Its Application I. NATO · Challenges of Modern Society, vol 1. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3344-9_22
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DOI: https://doi.org/10.1007/978-1-4613-3344-9_22
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