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The user may select either rural or urban dispersion parameters, depending on the characteristics of the source location.  The user also has the option of calculating concentration values or deposition values for a particular run.  For the Short Term model, the user may select more than one output type (concentration and/or deposition) in a single run, depending on the setting for one of the array storage limits.  The user can specify several short term averages to be calculated in a single run of the ISC Short Term model, as well as requesting the overall period (e.g. annual) averages.

1.2.4.2 Source Options.

     The model is capable of handling multiple sources, including point, volume, area and open pit source types.  Line sources may also be modeled as a string of volume sources or as elongated area sources.  Several source groups may be specified in a single run, with the source contributions combined for each group.  This is particularly useful for Prevention of Significant Deterioration (PSD) applications where combined impacts may be needed for a subset of the modeled background sources that consume increment, while the combined impacts from all background sources (and the permitted source) are needed to demonstrate compliance with the National Ambient Air Quality Standards (NAAQS).  The models contain algorithms for modeling the effects of aerodynamic downwash due to nearby buildings on point source emissions, and algorithms for modeling the effects of settling and removal (through dry deposition) of particulates.

     The Short Term model also contains an algorithm for modeling the effects of precipitation scavenging for gases or particulates.  For the Short Term model, the user may specify for the model to output dry deposition, wet deposition and/or total deposition.

 

 

 

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  APLICACIONES castellano: DIS CUS DES  RAD   english: DIS CUS DES RAD  

 

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