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DISPER software: Air pollution map produced by three different stacks (XZ-plane)
Canarina software for analysis of air pollution in environment: air pollution control, environmental engineering, environmental consultancy service, environment simulation, environmental modeling and environmental impact assessment. Air dispersion software: ISC 63 mixing height
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DISPER: Air pollution dispersion ˇ DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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Equation (1‑50) assumes
that the mixing height in rural and urban areas is known for all stability
categories. As explained below, the
meteorological preprocessor program uses mixing heights derived from twice‑daily
mixing heights calculated using the Holzworth (1972) procedures. The ISC models currently assume unlimited
vertical mixing under stable conditions, and therefore delete the infinite
series term in Equation (1‑50) for the E and F stability categories.
The Vertical Term defined by Equation (1‑50)
changes the form of the vertical concentration distribution from Gaussian to rectangular (i.e., a
uniform concentration within the surface mixing layer) at long downwind
distances. Consequently, in order to reduce
computational time without a loss of accuracy, Equation (1‑50) is changed
to the form:
|
|
at downwind distances where the
σz/zi ratio is greater than or equal to 1.6.
