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DISPER software: Air pollution map produced by three different stacks (XZ-plane)
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DISPER: Air pollution dispersion ˇ DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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1.5.5 The Dispersion Parameters
The dispersion parameters used
in the complex terrain algorithms of ISC are the same as the point source
dispersion parameters for the simple terrain algorithms described in Section
1.1.5.1, except that the radial distance is used instead of the downwind
distance. Since the lateral distribution
of the plume in complex terrain is determined by the sector average approach,
the complex terrain algorithm does not use the lateral dispersion parameter,
σy. The procedure to
account for buoyancy-induced dispersion in the complex terrain algorithm only
affects the vertical dispersion term (see Equation 1-48). Since the complex terrain algorithm does not
incorporate the effects of building downwash, the enhanced dispersion
parameters and virtual distances do not apply.
1.5.6 The Vertical Term
The
Vertical Term used in the complex terrain algorithm in ISC is the same as
described in Section 1.1.6 for the simple terrain algorithm, except that the
plume height and dispersion parameter input to the vertical term are based on
the radial distance, as described above, and that the adjustment of plume
height for terrain above stack base is different, as described in Section
1.5.6.1.
