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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 91 exchanger
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DISPER: Air pollution dispersion ˇ DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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The
model accounts for partial retention of emissions within the pit by calculating
an escape fraction for each particle size category. The variations in escape fractions across
particle sizes result in a modified distribution of mass escaping from the
pit. Fluid modeling has shown that
within-pit emissions have a tendency to escape from the upwind side of
the pit. The open pit algorithm
simulates the escaping pit emissions by using an effective rectangular area
source using the ISC area source algorithm described in Section 1.2.3. The shape, size and location of the effective
area source varies with the wind direction and the relative depth of the pit. Because the shape and location of the
effective area source varies with wind direction, a single open pit source
should not be subdivided into multiple pit sources.
The
escape fraction for each particle size catagory, εi, is
calculated as follows:
|
|
where:
vg =is the
gravitational settling velocity (m/s),
Ur =is the approach wind speed
at 10m (m/s),
α =is the proportionality constant in the
relationship between flux from the pit and the product of Ur and
concentration in the pit (Thompson, 1994).
