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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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2.3 THE ISC LONG‑TERM DRY DEPOSITION MODEL
2.3.1 General
The
concepts upon which the ISC long‑term dry deposition model are based are
discussed in Sections 1.1.6.3 and 1.3.
2.3.2 Point and Volume Source Emissions
The
seasonal deposition at the point located at a particular distance (r) and
direction (θ) with respect to the base of a stack or the center of a
volume source for particulates in the nth particle size category is
given by:
|
|
where the vertical term for deposition, Vdn, was defined in
Section 1.3.2. K and D are described in
Equations (1‑1) and (1‑63), respectively. Qτ is the product of the
total time during the lth season, of the seasonal emission rate Q
for the ith wind‑speed category, kth stability
category. For example, if the emission
rate is in grams per second and there are 92 days in the summer season (June,
July, and August), Qτ,l-3 is given by 7.95 x 106 Ql-3. It should be noted that the user need not
vary the emission rate by season or by wind speed and stability. If an annual average emission rate is
assumed, Qτ is equal to 3.15 x 107 Q for a 365‑day
year. For a plume comprised of N
particle size categories, the total seasonal deposition is obtained by summing
Equation (2‑7) over the N particle size categories. The program also sums the seasonal deposition
values to obtain the annual deposition.
