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DISPER: Air pollution dispersion ˇ DISPER - Solutions - Data - Algorithms - Emissions - Graphs - ISC3 (VOL. 2)
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1.2.3 The Short‑Term Area Source Model
The ISC Short Term area source
model is based on a numerical integration over the area in the upwind and
crosswind directions of the Gaussian point source plume formula given in
Equation (1‑1). Individual area
sources may be represented as rectangles with aspect ratios (length/width) of
up to 10 to 1. In addition, the
rectangles may be rotated relative to a north-south and east-west
orientation. As shown by Figure 1‑9,
the effects of an irregularly shaped area can be simulated by dividing the area
source into multiple areas. Note that
the size and shape of the individual area sources in Figure 1‑9 varies;
the only requirement is that each area source must be a rectangle. As a result, an irregular area source can be
represented by a smaller number of area sources than if each area had to be a
square shape. Because of the flexibility
in specifying elongated area sources with the Short Term model, up to an aspect
ratio of about 10 to 1, the ISCST area source algorithm may also be useful for
modeling certain types of line sources.
The
ground‑level concentration at a receptor located downwind of all
or a portion of the source area is given by a double integral in the upwind (x)
and crosswind (y) directions as:
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