GMS:MF6 TDIS Package

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MODFLOW 6
Models & Tools
GWF Model
GWT Model
Cell Properties Dialog
Zone File
Packages
Flow: GNC, HFB, NPF
GWF: BUY, CHD, CSUB,
DRN, EVT, GHB,
LAK, MAW, MVR,
OBS, RCH,RIV,
SFR, STO, UZF,
WEL
GWT: ADV, CNC, DSP
FMI, IC, IST, LKT,
MDT, MST, MVT,
MWT, OBS, SFT,
SRC,SSM, UZT
Other DIS, DISU, DISV,
IMS, OC, TDIS

The Temporal Discretization (TDIS) Package dialog

The Temporal Discretization (TDIS) Package dialog is accessed by double-clicking on the TDIS package under a MODFLOW 6 simulation in the Project Explorer. It contains the following sections and options:

  • Sections list – A list of sections that can be turned on or off:
    • Comments – Turn on to make the Comments section visible.
    • Options – Turn on to make the Options section visible.
    • PeriodData – Turn on to make the PeriodData section visible. This section is on by default.
  • Comments section – Enter general alphanumeric comments. Comments entered here get written at the top of the file, preceded by a '#' symbol.
  • Options section – Temporal options and settings:
    • Time units drop-down – Time unit label used in output files. Contains a drop-down menu with the following options for the type of time units:
      • "Unknown"
      • "Seconds"
      • "Minutes"
      • "Hours"
      • "Days" – The default selection.
      • "Years"
    • Start date/time – Starting date and time. Turn on to enable setting a start date/time. Included in the list file using the selected time/date. Click the Date/Time... button to bring up the Date/Time dialog. The time can also be manually entered using "YYYY-MM-DDTHH:MM:SS" format. The "T" in the middle divides the date from the time.
  • PeriodData section – Contains a spreadsheet listing periods. An Row-add.svg Add Row button is found at the top rigth of the spreadsheet. Right-clicking on the row number in the spreadsheet gives a menu that allows inserting, deleting, copying, or pasting a row. The columns in the spreadsheet include:
    • PERLEN – The length of a stress period. The default value is "1.0".
    • NSTP – The number of time steps in a stress period. The default value is "1".
    • TSMULT – The multiplier for the length of successive time steps. The default value is "1.0".
    • ENDDATE – The end date for that period. This field is not directly user-editable, but will automatically change if the PERLEN value is changed.
    • STEADY-STATE GWF_Model – Turn on if the period is steady state and using the GWF Model.

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