2.5 MODIFYING AN EXISTING RUNSTREAM FILE
As noted earlier, one of the advantages of the keyword/parameter approach and the flexible format adopted for the input runstream file is that it will be easier for the user to make modifications to the runstream file and obtain the desired result. This section briefly illustrates some examples of how a runstream file can be modified. It is assumed that the reader is familiar with the operation of and basic editing commands for a text editor (i.e., a program that edits ASCII files), and is familiar with the previous sections of this tutorial.
2.5.1 Modifying Modeling Options
Depending on the type of analysis being performed, the user may need to modify the modeling options and run the model again. Because of the descriptive nature of the keywords and the secondary keywords used to control the modeling options, this can easily be done with the new runstream file, and usually without having to refer back to the user's guide each time a modification is attempted.
One example where a modeling option might need to be changed is if a modeler wanted to obtain both concentration estimates and estimates of dry deposition for a source or sources of large particulates. The only change needed to accomplish this is to replace the secondary keyword of CONC (for CONCentration) with the secondary keyword of DEPOS (for DEPOSition) on the MODELOPT input card. None of the source information needs to be changed since the model automatically converts the emission rates to the proper units for deposition calculations. For an ISCST run, both concentration and deposition can be estimated in the same model run. It is equally easy to modify a run to use urban dispersion instead of rural dispersion (or vice versa) by replacing the RURAL secondary keyword with URBAN on the MODELOPT card. As noted earlier, the order and exact spacing of the secondary keywords on the MODELOPT card is not important.
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APLICACIONES castellano: DIS CUS DES RAD english: DIS CUS DES RAD
português: DIS CUS DES RAD italiano: DIS CUS DES RAD
français: DIS CUS DES RAD