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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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1.5.6.1 The Vertical Term in Complex Terrain.
The
ISC complex terrain algorithm makes the following assumption about plume
behavior in complex terrain:
ˇThe
plume axis remains at the plume stabilization height above mean sea level as it
passes over complex terrain for stable conditions (categories E and F), and
uses a "half-height" correction factor for unstable and neutral
conditions (categories A - D).
ˇThe
plume centerline height is never less than 10 m above the ground level in
complex terrain.
ˇThe
mixing height is terrain following, i.e, the mixing height above ground at the
receptor location is assumed to be the same as the height above ground at the
source location.
ˇThe
wind speed is a function of height above the surface (see Equation (1‑6)).
Thus,
a modified plume stabilization height he´ is substituted for the
effective stack height he in the Vertical Term given by Equation (1‑50). The effective plume stabilization height at
the point x,y is given by:
|
|
where:
he =
plume height at point x,y without terrain adjustment, as described in Section
1.5.4 (m)
|
Ht |
=
z˝(x,y) - zs = terrain height of the
receptor location above the base of the stack (m) |
|
z˝(x,y) |
= height above mean sea level of terrain at
the receptor location (x,y) (m) |
|
zs |
=
height above mean sea level of the base of the stack (m) |
|
FT |
=
terrain adjustment factor, which is 0.5 for stability categories A - D and
0.0 for stability categories E and F. |
