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     Certain types of line sources can be handled in ISC using either a string of volume sources, or as an elongated area source.  The volume source algorithms are most applicable to line sources with some initial plume depth, such as conveyor belts and rail lines.  Section 1.2.2 of Volume II provides technical information on how to model a line source with multiple volume sources.  The use of the ISC area source algorithm for elongated rectangles would be most applicable to near ground level line sources, such as a viaduct.  Also, as shown in Section 1.2.3 of Volume II, irregularly shaped areas may be modeled with the ISC Models by subdividing the area.

     The source ID entered on the LOCATION card identifies that source for the remainder of the SO pathway inputs.  Since the model accepts alphanumeric strings of up to eight characters for the source ID, the sources can be identified with descriptive names, such as STACK1, STACK2, BOILER3, SLAGPILE, etc.  This may also be useful if line sources or irregularly-shaped area sources are being modeled as multiple volume or areas, as discussed above.  Since they are part of the same physical source, they can be given names that will identify them as being related, such as LINE1A, LINE1B, LINE1C, etc.

3.3.2 Specifying Source Release Parameters

     The main source parameters are input on the SRCPARAM card, which is a mandatory keyword for each source being modeled. Since the input parameters vary depending on the source type, the four source types handled by the ISC models (POINT, VOLUME, AREA and OPENPIT) are discussed separately.

 

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