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1.2.4.1 Dispersion Options.

     Since the ISC models are especially designed to support  the EPA's regulatory modeling programs, the regulatory modeling options, as specified in the Guideline on Air Quality Models (Revised), are the default mode of operation for the models. These options include the use of stack‑tip downwash, buoyancy‑induced dispersion, final plume rise (except for sources with building downwash), a routine for processing averages when calm winds occur, default values for wind profile exponents and for the vertical potential temperature gradients, and the use of upper bound estimates for super‑squat buildings having an influence on the lateral dispersion of the plume. The user can easily ensure the use of the regulatory default options by selecting a single keyword on the modeling option input card.  To maintain the flexibility of the model, the non‑regulatory default options have been retained, and by using descriptive keywords to specify these options it is evident at a glance from the input or output file which options have been employed for a particular application.

     The Short Term model also incorporates the COMPLEX1 screening model dispersion algorithms for receptors in complex terrain, i.e., where the receptor elevation is above the release height of the source.  The user has the option of specifying only simple terrain (i.e., ISCST) calculations, only complex terrain (i.e., COMPLEX1) calculations, or of using both simple and complex terrain algorithms.  In the latter case, the model will select the higher of the simple and complex terrain calculations on an hour-by-hour, source-by-source and receptor-by-receptor basis for receptors in intermediate terrain, i.e., terrain between release height and plume height.

 

 

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