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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 49 photochemical
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DISPER: Air pollution dispersion · DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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The ISC model programs account
for the effects of building wakes by modifying both
σy and σz for plumes with plume height to
building height ratios less than or equal to 1.2 and by modifying only σz
for plumes from stacks with plume height to building height ratios greater than
1.2 (but less than 2.5). The plume
height used in the plume height to stack height ratios is the same plume height
used to determine if the plume is affected by the building wake. The ISC models define buildings as squat (hw
³ hb)
or tall (hw < hb).
The ISC models include a general procedure for modifying σz
and σy at distances greater than or equal to 3hb for
squat buildings or 3hw for tall buildings. The air flow in the building cavity region is
both highly turbulent and generally recirculating. The ISC models are not appropriate for
estimating concentrations within such regions.
The ISC assumption that this recirculating cavity region extends to a downwind distance of 3hb
for a squat building or 3hw for a tall building is most appropriate
for a building whose width is not much greater than its height. The ISC user is cautioned that, for other types
of buildings, receptors located at downwind distances of 3hb (squat
buildings) or 3hw (tall buildings) may be within the recirculating
region.
