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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 130 modelization
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DISPER: Air pollution dispersion ˇ DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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2.1.5.3 Procedures Used to Account for the Effects of Building Wakes on Effluent
Dispersion.
With the exception of the
equations used to calculate the lateral virtual distance, the procedures
used to account for the effects of building wake effects on effluent dispersion
are the same as those outlined in Section 1.1.5.3 for the short‑term
model. The calculation of lateral virtual
distances by the long‑term model is discussed in Section 2.1.5.2 above.
2.1.5.4 Procedures Used to Account for Buoyancy‑Induced Dispersion.
See
the discussion given in Section 1.1.5.4.
2.1.6 The Vertical Term
2.1.6.1 The Vertical Term for Gases and Small
Particulates.
Except for the use of seasons
and discrete categories of wind‑speed and stability, the Vertical Term
for gases and small particulates corresponds to the short term version
discussed in Section 1.1.6. The user may
assign a separate mixing height zi to each combination of wind‑speed
and stability category for each season.
As
with the Short‑Term model, the Vertical Term is changed to the
form:
|
|
at downwind distances where the σz/zi ratio
is greater than or equal to 1.6.
Additionally, the ground‑level concentration is set equal to zero
if the effective stack height he exceeds the mixing height zi. As explained in Section 1.1.6.1, the ISC
model currently assumes unlimited mixing for the E and F stability categories.
