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4.2.2 Modifying PARAMETER Statements for Unusual Modeling Needs

     As discussed in Section 2.3, the ISC models make use of a static storage allocation design, where the model results are  stored in explicitly dimensioned data arrays, and the array limits are controlled by PARAMETER statements in the Fortran computer code.  These array limits also correspond to the limits on the number of sources, receptors, source groups and averaging periods that the model can accept for a given run. Depending on the amount of memory available on the particular computer system being used, and the needs for a particular modeling application, the storage limits can easily be changed by modifying the PARAMETER statements and recompiling the model.

     The limits on the number of receptors, sources, source groups, averaging periods, and events (for ISCEV model) are initially set as follows for the three models for the DOS and extended memory (EM) versions on the PC:

  PARAMETER

    Name

   Limit

Controlled

 

   ISCST

 

   ISCEV

 

   ISCLT

    NREC

Number of

Receptors

500 (DOS)

1200  (EM)

     ‑

500 (DOS)

1200  (EM)

    NSRC

Number of

  Sources

100 (DOS)

300  (EM)

  100 (DOS)

  500  (EM)

  50 (DOS)

300  (EM)

    NGRP

Number of

  Source

  Groups

   2 (DOS)

   4  (EM)

   25 (DOS)

   50  (EM)

   3 (DOS)

   5  (EM)

    NAVE

Number of

Short Term

Averages

   2 (DOS)

   4  (EM)

    4 (DOS)

    4  (EM)

    ‑

    NEVE

Number of

  Events

    ‑

2500 (DOS)

5000  (EM)

    ‑

 

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