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3.9.2.7 TOXX Model Input Files

     The user may select an option for the ISCST model to generate an unformatted file or files of concentration (or deposition) values exceeding a user‑specified threshold for use with the TOXX model component of TOXST.  The OU TOXXFILE keyword controls this option.  The user may select separate files for each averaging period for which a threshold violation file may be needed.  Each file includes several records with header information identifying the title, averaging period, threshold value, and receptor network information, and then records including every occurrence where the result of any source group for that averaging period equals or exceeds the threshold value.  Records are also output that identify the averaging period (hour number of the year), source group number and receptor number corresponding to the concentration values.

     The structure of the threshold exceedance file for use with the TOXX model component of TOXST is described in more detail in Appendix F.  Each of the files selected by the user is opened explicitly by the model as an unformatted file.  The filenames are provided on the input runstream image.  The user may specify the file unit on the TOXXFILE card through the optional Funit parameter.  User‑specified units must be greater than or equal to 20, and are recommended to be less than or equal to 100.  If no file unit is specified, then the file unit is determined internally according to the following formula.

ITXUNT = 300 + IAVE

where ITXUNT is the Fortran unit number, and IAVE is the averaging period number (the order of the averaging period as specified on the CO AVERTIME card).  This formula will not cause any conflict with other file units used by the model for up to 4 short term averaging periods.

     The user may also select an option for the ISCLT model to generate an output for use with the RISK model component of TOXLT.  The OU TOXXFILE keyword also controls this option.  The user can specify a separate TOXXFILE for each long term averaging period and source group combination.  The TOXXFILE option may also be used for PERIOD averages with the ISCLT model.  The structure of the TOXXFILE output for ISCLT is very similar to the long term PLOTFILE output, except that results are output for each individual source in the specified source group.  The structure of the long term TOXXFILE is described in more detail in Appendix F.  Each of the files selected by the user is opened explicitly by the model as a formatted file.  The filenames are provided on the input runstream image.  The user may specify the file unit on the TOXXFILE card through the optional Funit parameter.  User‑specified units must be greater than or equal to 20, and are recommended to be less than or equal to 100.  If no file unit is specified, then the file unit is determined internally according to the following formulas:

   ITXUNT = 500 + IAVE*10 + IGRP      for long term averages

   IPXUNT = 700 + IGRP*10             for PERIOD averages

where ITXUNT and IPXUNT are the Fortran unit numbers, IAVE is the averaging period number (in the order of months, seasons or quarters, and annual), and IGRP is the source group number (in the order is which the groups are defined in the SO pathway).  This formula will not cause any conflict with other file units used by the model for up to 9 source groups.

 

201 - 202 - 203 - 204 - 205 - 206 - 207 - 208 - 209 - 210 - 211 - 212 - 213 - 214 - 215 - 216 - 217 - 218 - 219 - 220 - 221 - 222 - 223 - 224 - 225 - 226 - 227 - 228 - 229 - 230 - 231 - 232 - 233 - 234 - 235 - 236 - 237 - 238 - 239 - 240 - 241 - 242 - 243 - 244 - 245 - 246 - 247 - 248 - 249 - 250

 

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