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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 88 coefficients
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DISPER: Air pollution dispersion ˇ DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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Since the ISCST algorithm
estimates the integral over the area upwind of the receptor location, receptors
may be located within the area itself, downwind of the area, or adjacent to the
area. However, since σz
goes to 0 as the downwind distance goes to 0 (see Section 1.1.5.1), the plume
function is infinite for a downwind receptor distance of 0. To avoid this singularity in evaluating the
plume function, the model arbitrarily sets the plume function to 0 when the
receptor distance is less than 1 meter.
As a result, the area source algorithm will not provide reliable results
for receptors located within or adjacent to very small areas, with dimensions
on the order of a few meters across. In
these cases, the receptor should be placed at least 1 meter outside of the
area.
In
Equation (1-65), the integral in the lateral (i.e., crosswind or y) direction
is solved analytically as follows:
|
|
where erfc is the complementary error function.
