SIM-TDIS

Structure of Blocks

FOR EACH SIMULATION

    BEGIN OPTIONS
      [TIME_UNITS <time_units>]
      [START_DATE_TIME <start_date_time>]
    END OPTIONS

    BEGIN DIMENSIONS
      NPER <nper>
    END DIMENSIONS

FOR ANY STRESS PERIOD

    BEGIN PERIODDATA
      <perlen> <nstp> <tsmult>
      <perlen> <nstp> <tsmult>
      ...
    END PERIODDATA

Explanation of Variables

Block: OPTIONS

  • time_units is the time units of the simulation. This is a text string that is used as a label within model output files. Values for time_units may be “unknown”, “seconds”, “minutes”, “hours”, “days”, or “years”. The default time unit is “unknown”.

  • start_date_time is the starting date and time of the simulation. This is a text string that is used as a label within the simulation list file. The value has no affect on the simulation. The recommended format for the starting date and time is described at https://www.w3.org/TR/NOTE-datetime.

Block: DIMENSIONS

  • nper is the number of stress periods for the simulation.

Block: PERIODDATA

  • perlen is the length of a stress period.

  • nstp is the number of time steps in a stress period.

  • tsmult is the multiplier for the length of successive time steps. The length of a time step is calculated by multiplying the length of the previous time step by TSMULT. The length of the first time step, Delta t_1, is related to PERLEN, NSTP, and TSMULT by the relation Delta t_1= perlen frac{tsmult - 1}{tsmultnstp-1}.

Example Input File

    # Comment for this TDIS input file
    
    BEGIN OPTIONS
      TIME_UNITS DAYS
    END OPTIONS
    
    BEGIN DIMENSIONS
      NPER 2
    END DIMENSIONS
    
    BEGIN PERIODDATA
       365.00  1 1.0   Items: PERLEN NSTP TSMULT
       365.00 10 1.2   Items: PERLEN NSTP TSMULT
    END PERIODDATA