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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 82 rise
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DISPER: Air pollution dispersion ˇ DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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1.2.2 The Short‑Term Volume Source Model
The ISC models use a virtual point source algorithm to
model the effects of volume sources, which means that an imaginary or virtual
point source is located at a certain distance upwind of the volume source
(called the virtual distance) to account for the initial size of the volume
source plume. Therefore, Equation (1‑1)
is also used to calculate concentrations produced by volume source
emissions.
There are two types of volume
sources: surface‑based sources,
which may also be modeled as area sources, and elevated sources. An example of a surface‑based source is
a surface rail line. The effective
emission height he for a surface‑based source is usually set
equal to zero. An example of an elevated
source is an elevated rail line with an effective emission height he
set equal to the height of the rail line.
If the volume source is elevated, the user assigns the effective
emission height he, i.e., there is no plume rise associated with
volume sources. The user also assigns
initial lateral (σyo) and vertical (σzo)
dimensions for the volume source.
Lateral (xy) and vertical (xz) virtual distances are added to the
actual downwind distance x for the σy and σz
calculations. The virtual distances are
calculated from solutions to the sigma equations as is done for point sources
with building downwash.
