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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 93 short term
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DISPER: Air pollution dispersion ˇ DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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Because of particle settling within the pit, the distribution of mass
escaping the pit is different than that emitted within the pit. The adjusted total particulate emission rate,
Qa, and the adjusted mass fractions, φai, reflect
this change, and it is these adjusted values that are used for modeling the
open pit emissions.
The following describes the
specification of the location, dimensions and adjusted emissions for the
effective area source used for modeling open pit emissions. Consider an arbitrary rectangular-shaped pit
with an arbitrary wind direction as shown in Figure 1-10. The steps that the model uses for determining
the effective area source are as follows:
1.Determine the upwind sides of the
pit based on the wind direction.
2.Compute the along wind length of
the pit (l) based on the wind direction and the pit geometry . l varies between the lengths of the two sides
of the rectangular pit as follows:
|
|
where L is the long axis and W is
the short axis of the pit, and θ is the wind direction relative to the
long axis (L) of the pit (therefore θ varies between 0° and 90°). Note that with this formulation and a square
pit, the value of l will remain constant with wind direction at l = L = W. The along wind dimension, l, is the scaling
factor used to normalize the depth of the pit.
