SIM-TDIS
Structure of Blocks
FOR EACH SIMULATION
BEGIN OPTIONS
[TIME_UNITS <time_units>]
[START_DATE_TIME <start_date_time>]
[ATS6 FILEIN <ats6_filename>]
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 effect on the simulation. The recommended format for the starting date and time is described at https://www.w3.org/TR/NOTE-datetime.ATS6
keyword to specify that record corresponds to an adaptive time step (ATS) input file. The behavior of ATS and a description of the input file is provided separately.FILEIN
keyword to specify that an input filename is expected next.ats6_filename
defines an adaptive time step (ATS) input file defining ATS controls. Records in the ATS file can be used to override the time step behavior for selected stress periods.
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