Fundamentals of Boundary-Layer Meteorology by Xuhui Lee

Author:Xuhui Lee
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

The impact of air stability on air quality cannot be deduced from simple intuitive reasoning. As air changes from being stable to being unstable, σ y and σ z will become larger at the same downwind distance. The fractional part of Eq. 7.28 becomes smaller but the exponential parts become larger. The overall influence can only be quantified by performing actual calculation with the Pasquill-Gifford formulae and Eq. 7.28. The results are shown in Fig. 7.5. In unstable conditions, the maximum ground-level concentration is much higher, and bad air quality is confined to a region closer the stack than in neutral and stable conditions.

Fig. 7.5Ground-level concentration below the centerline of a smoke plume in three stability conditions

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