188.8.131.52 Selecting Options for Special Purpose Output Files.
The ISCST model provides options for four types of output files for specialized purposes. One option produces files of all occurrences of violations of user‑specified threshold values (MAXIFILE keyword), another option produces files of concurrent (raw) results at each receptor suitable for post‑processing (POSTFILE keyword), and a third option produces files of design values that can be imported into graphics packages in order to produce contour plots (PLOTFILE keyword), and a fourth option produces unformatted files of raw results above a threshold value with a special structure for use with the TOXX model component of TOXST (TOXXFILE keyword). Each of these options is described in detail below.
The syntax and type for the MAXIFILE keyword are summarized below:
OU MAXIFILE Aveper Grpid Thresh Filnam (Funit)
where the Aveper parameter is the short term averaging period (e.g. 3, 8, 24 for 3, 8 and 24‑hour averages, or MONTH for monthly averages) and Grpid is the source group ID for which the MAXIFILE option is selected. The Thresh parameter is the user‑specified threshold value, and Filnam is the name of the file where the MAXIFILE results are to be written. The optional Funit parameter allows the user the option of specifying the Fortran logical file unit for the output file. The user‑specified file unit must be in the range of 20‑100, inclusive. By specifying the same filename and unit for more than one MAXIFILE card, results for different source groups and/or averaging periods may be combined into a single file. If the Funit parameter is omitted, then the model will dynamically allocate a unique file unit for this file (see Section 3.9.2).
The MAXIFILE card may be repeated for each combination of averaging period and source group, and a different filename should be used for each file. The resulting maximum value file will include several header records identifying the averaging period, source group and the threshold value for that file, and a listing of every occurrence where the result for that averaging period/source group equals or exceeds the threshold value. Each of these records includes the averaging period, source group ID, date for the threshold violation (ending hour of the averaging period), the x, y, z and flagpole receptor height for the receptor location where the violation occurred, and the concentration or deposition value. If more than one output type is selected in a model run, then the MAXIFILE threshold will only apply to the first output type selected among the list of CONC, DEPOS, DDEP, and/or WDEP, and only the corresponding value will be output in the maximum value file.
Each of the threshold violations, except for monthly averages, identify events that may be modeled for source contribution information with the ISCEV (EVENT) model by selecting the CO EVENTFIL option (see Sections 3.2.9 and 3.7). Each of the threshold violations is included as an event on the EV pathway, and is given a name of the form THxxyyyy, where xx is the averaging period, and yyyy is the violation number for that averaging period. For example, an event name of TH240019 identifies the 19th threshold violation for 24‑hour averages. Monthly average threshold violations are included in the file specified on the MAXIFILE card, but are not included in the ISCEV model input file since the ISCEV model currently handles only averaging periods of up to 24 hours.
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