Source emission rates can be treated as constant throughout the modeling period, or may be varied by month, season, hour‑of‑day, or other optional periods of variation. These variable emission rate factors may be specified for a single source or for a group of sources. For the Short Term model, the user may also specify a separate file of hourly emission rates for some or all of the sources included in a particular model run.
188.8.131.52 Receptor Options.
The ISC models have considerable flexibility in the specification of receptor locations. The user has the capability of specifying multiple receptor networks in a single run, and may also mix Cartesian grid receptor networks and polar grid receptor networks in the same run. This is useful for applications where the user may need a coarse grid over the whole modeling domain, but a denser grid in the area of maximum expected impacts. There is also flexibility in specifying the location of the origin for polar receptors, other than the default origin at (0,0) in x,y, coordinates.
The user can input elevated receptor heights in order to model the effects of terrain above (or below) stack base, and may also specify receptor elevations above ground level to model flagpole receptors. For simple terrain calculations, any terrain heights input above the release height for a particular source are "chopped‑off" at the release height for that source's calculations. The Short Term model includes the complex terrain algorithms from the COMPLEX1 screening model. If these algorithms are used, the model will calculate impacts for terrain above the release height. The Long Term model does not include any complex terrain algorithms.
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