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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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Once the model has determined
the characteristics of the effective area used to model pit emissions for a
particular hour, the area source algorithm described in Section 1.2.3 is used
to calculate the concentration or deposition flux values at the receptors being
modeled.
1.3 THE ISC SHORT‑TERM DRY DEPOSITION MODEL
1.3.1 General
This section describes the ISC
Short Term dry deposition model, which is used to calculate the amount of
material deposited (i.e., the deposition flux, Fd) at the surface
from a particle plume through dry deposition processes.
The Short Term dry deposition
model is based on a dry deposition algorithm (Pleim et al., 1984) contained in
the Acid Deposition and Oxidant Model (ADOM).
This algorithm was selected as a result of an independent model
evaluation study (EPA, 1994).
The deposition flux, Fd,
is calculated as the product of the concentration, χd, and a
deposition velocity, vd, computed at a reference height zd:
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