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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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The ISCLT model uses a set of
three criteria to determine whether the process of calculating the sector
average concentration has "converged." The calculation process will be considered to
have converged, and the most recent estimate of the trapezoidal integral used,
if any of the following conditions is true:
1) if
the number of "halving intervals" (N) in the trapezoidal
approximation of the sector average has reached 10, where the number of
individual elements in the approximation is given by 1 + 2N-1 = 513
for N of 10;
2) if
the estimate of the sector average has converged to within a tolerance of 0.02
(i.e., 2 percent), for two successive iterations, and at least 2 halving
intervals have been completed (a minimum of 5 wind direction simulations); or
3) if
the estimate of the sector average concentration is less than 1.0E-10, and at
least 2 halving intervals have been completed.
The first condition essentially puts a time limit on the integration
process, the second condition checks for the accuracy of the estimate of the
sector average, and the third condition places a lower threshold limit that
avoids convergence problems associated with very small concentrations where
truncation error may be significant.
2.2.4 The Long‑Term Open Pit Source Model
The
ISC Long Term Open Pit Source Model is based on the use of the long term area
source model described in Section 2.2.3.
The escape fractions and adjusted mass distribution for particle
emissions from an open pit, and the determination of the size, shape and
location of the effective area source used to model open pit emissions are
described in Section 1.2.4. For the Long
Term model, a sector average value for open pit sources is calculated by
determining an effective area for a range of wind directions within the sector
and increasing the number of wind directions used until the result converges,
as described in Section 2.2.3 for the Long Term area source model. The contribution from each effective area
used within a sector is calculated using the Short Term area source model
described in Section 1.2.3.
