GMS:DE4 Package

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MODFLOW
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Packages
Flow: BCF6, HUF, LPF, UPW
Solvers:

DE4, GMG, NWT, PCG,

PCGN, LMG, SIP, SOR,

SMS
Other:

BAS6, BFH, CHD1, CLN,

DRN1, DRT1, EVT1, ETS1,

GAGE, GHB1, GNC, HFB1,

HUF, LAK3, MNW1, MNW2,

OUT1, RCH1, RIV1, SFR2,

STR1, SUB1, SWI2, WEL1,

UZF1
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The DE4 package or Direct Solver is one of the solvers available for MODFLOW. It requires reading in a DE4 file. The MODFLOW DE4 Solver package dialog will show the variables in the DE4 file. Variables include:

  • Comments (Text) – Allows up to 199 characters.
  • Maximum number of iterations (ITMX) –
  • Maximum number of upper equations (MXUP) – Impacts the amount of memory used by the package. Writes the actual number of equations in the upper part when the package runs.
  • Maximum number of lower equations (MXLOW) – Impacts the amount of memory used by the package. Writes the actual number of equations in the lower part when the package runs.
  • Maximum bandwidth (MXBW) – Impacts the amount of memory used by the package. Writes the actual band width plus 1 when the package runs.
  • Frequency of change of coefficients in A (IFREQ)
  • Print flag for convergence information per time step (MUTD4)
  • Head change multiplier (ACCL)
  • Head change closure criterion (HCLOSE)
  • Interval for time step printing (IPRD4)

For more information on this solver see page 84 of the USGS documentation at http://pubs.er.usgs.gov/usgspubs/ofr/.

The MODFLOW DE4 Solver package dialog.

DE4 File Format

FOR EACH SIMULATION
 0.  [#Text]
 1.  ITMX   MXUP   MXLOW   MXBW
 2.  IFREQ  MUTD4  ACCL    HCLOSE   IPRD4

Item 0 is optional—“#” must be in column 1. Item 0 can be repeated multiple times.


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