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DISPER: Air pollution dispersion ˇ DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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1.4 THE ISC SHORT‑TERM WET DEPOSITION MODEL
A
scavenging ratio approach is used to model the deposition of gases and
particles through wet removal. In this
approach, the flux of material to the surface through wet deposition (Fw)
is the product of a scavenging ratio times the concentration, integrated in the
vertical:
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where the scavenging ratio (Λ)
has units of s-1. The
concentration value is calculated using Equation (1-1). Since the precipitation is assumed to
initiate above the plume height, a wet deposition flux is calculated even if
the plume height exceeds the mixing height.
Across the plume, the total flux to the surface must equal the mass lost
from the plume so that
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Solving this equation for Q(x), the
source depletion relationship is obtained
as follows:
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where t = x/u is the plume travel
time in seconds. As with dry deposition
(Section 1.3), the ratio Q(x)/Qo is computed as a wet depletion factor,
which is applied to the flux term in Equation (1-89). The wet depletion calculation is also
optional. Not considering the effects of
wet depletion will result in conservative estimates of both concentration and
deposition, since material deposited on the surface is not removed from the
plume.
