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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 78 modeling
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DISPER: Air pollution dispersion ˇ DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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Therefore a limit is placed on each term involving σz in
Equation (1-60) so that each term does not exceed the corresponding term in zi. Similarly, since the leading order term in
P(x,zd) for σz = ax(1 + bx)1/2
corresponds to the 
term in Equation (1-62), σz
is capped at 
for this P(x,zd) as
well. Note that these caps to σz
in Equation (1-60) are broadly consistent with the condition on the use of the
well-mixed limit on V in Equation (1-51) which uses a ratio σz/zi
= 1.6. In Equation (1-62), the
corresponding ratios are σz/zi = 1.4, 1.6, and 1.9.
In many applications, the
removal of material from the plume may be extremely small, so that FQ(x)
and P(x,z) are virtually unity. When
this happens, the vertical term is virtually unchanged (Vd = V, see
Equation (1-54)). The deposition flux
can then be approximated as vdχ rather than vdχd. The plume depletion calculations are optional, so that
the added expense of computing FQ(x) and P(x,z) can be avoided. Not considering the effects of dry depletion
results in conservative estimates of both concentration and deposition, since
material deposited on the surface is not removed from the plume.
