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1.2.4.6 Source Contribution Analyses.

     In air quality dispersion modeling applications, the user may have a need to know the contribution that a particular source makes to an overall concentration value for a group of sources.  This section provides a brief introduction to how these types of source contribution (sometimes referred to as source culpability) analyses are performed using the ISC models.  More detailed information about exercising these options is provided in Section 3.

     Recognizing that source contribution information is important to many short term modeling analyses, the ISCST model has been designed to facilitate performing this type of analysis.  This is accomplished with an additional model, referred to as the ISC Short Term ‑ EVENT model (ISCEV).  The ISCST model treats source groups independently.  The ISCEV (EVENT) model is set up specifically to provide the contributions from individual sources to the concentration values for particular events.  These events may be the design concentrations (e.g., the high‑second‑high 24‑hour average concentration for a particular group of sources) that were generated from an execution of the ISCST model.  Other events of interest might be occurrences of violations of a particular standard, for which it is necessary to determine whether the source being permitted contributes above a significance level.  The models are set up in such a way that both of these types of events can be passed directly from an execution of the ISCST model to an input file for the EVENT model.  The user is thus able to run the models in a batch mode to obtain the overall design value results from ISCST and the source contribution information from ISCEV in a single step.  The EVENT model can also be run separately and accepts user‑specified events for source contribution processing.

 

 

 

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