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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 97 evaporator
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DISPER: Air pollution dispersion ˇ DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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where Qa is the emission rate per unit area (from the pit
after adjustment for escape fraction) if the emissions were uniformly released
from the actual pit opening (with an area of L×W).
That is, if the effective area is one-third of the total area, then the
emission rate (per unit area) used for the effective area is three times that
from the full area.
Because of the high level of
turbulence in the mine, the pollutant is initially mixed prior to exiting the
pit. Therefore some initial vertical
dispersion is included to represent this in the effective area source. Using the effective pit depth, de,
as the representative dimension over which the pollutant is vertically mixed in
the pit, the initial vertical dispersion value, σzo, is equal
to de/4.3. Note that 4.3×σzo
represents about 90% of a Gaussian plume (in the vertical), so that the mixing
in the pit is assumed to approximately equal the mixing in a plume.
Therefore, for the effective
area source representing the pit emissions, the initial dispersion is included
with ambient dispersion as:
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For receptors close to the pit, the initial dispersion value can be
particularly important.
