GMS:MODFLOW Packages Supported in GMS: Difference between revisions

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[[GMS:MODFLOW|MODFLOW]] is divided into a series of components called "packages." Each package performs a specific task. The input for each package is generally contained in a separate file. The MODFLOW packages supported by GMS are listed in the following tables.
[[GMS:MODFLOW|MODFLOW]] is divided into a series of components called "packages." Each package performs a specific task. The input for each package is generally contained in a separate file. The MODFLOW packages supported by GMS are listed in the following tables.


The MODFLOW packages to be used in the MODFLOW simulation are specified in the Packages dialog. This dialog is accessed in the [[GMS:Global Options/Basic Package|Global Options\Basic Package]] dialog. Some of the packages are always required for a simulation and some are optional. One of the flow model packages and one of the solver packages must be selected. Each of the boundary condition/source/sink packages is optional.
The MODFLOW packages to be used in the MODFLOW simulation are specified in the Packages dialog. This dialog is accessed in the [[GMS:Global Options/Basic Package|''Global Options\Basic Package'']] dialog. Some of the packages are always required for a simulation and some are optional. One of the flow model packages and one of the solver packages must be selected. Each of the boundary condition/source/sink packages is optional.


For any package not currently supported in GMS, the file associated with that package will be ignored when the model is imported. However, GMS keeps track of unsupported packages it encounters when reading the name file and, when the project is saved, GMS lists the unsupported packages in the name file and copies the unsupported package files from the old directory to the new directory.
For any package not currently supported in GMS, the file associated with that package will be ignored when the model is imported. However, GMS keeps track of unsupported packages it encounters when reading the name file and, when the project is saved, GMS lists the unsupported packages in the name file and copies the unsupported package files from the old directory to the new directory.
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<sup>1</sup> One of these solvers must be selected in the Packages dialog.
<sup>1</sup> One of these solvers must be selected in the Packages dialog.


Once a solver has been selected, the appropriate solver package dialog can be accessed through one of the solver commands (LMG, SIP, PCG2, or SSOR) in the '''''MODFLOW''''' menu. The default values shown in each dialog are typically adequate.
Once a solver has been selected, the appropriate solver package dialog can be accessed through one of the solver commands (LMG, SIP, PCG2, or SSOR) in the ''MODFLOW'' menu. The default values shown in each dialog are typically adequate.


For more information on Solver Packages visit: http://water.usgs.gov/nrp/gwsoftware/modflow2000/MFDOC/index.html
For more information on Solver Packages visit: http://water.usgs.gov/nrp/gwsoftware/modflow2000/MFDOC/index.html

Revision as of 17:12, 14 May 2012

MODFLOW
Pre-processing
MODFLOW Commands
Building a MODFLOW Model
Map to MODFLOW
Calibration
Packages Supported in GMS
Saving a MODFLOW Simulation
Importing MODFLOW Files
Unsupported MODFLOW Features
Run MODFLOW
Post-processing
MODFLOW Display Options
MODFLOW Post-Processing Viewing Options
Reading a MODFLOW Simulation
Tutorials
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
v • e

MODFLOW is divided into a series of components called "packages." Each package performs a specific task. The input for each package is generally contained in a separate file. The MODFLOW packages supported by GMS are listed in the following tables.

The MODFLOW packages to be used in the MODFLOW simulation are specified in the Packages dialog. This dialog is accessed in the Global Options\Basic Package dialog. Some of the packages are always required for a simulation and some are optional. One of the flow model packages and one of the solver packages must be selected. Each of the boundary condition/source/sink packages is optional.

For any package not currently supported in GMS, the file associated with that package will be ignored when the model is imported. However, GMS keeps track of unsupported packages it encounters when reading the name file and, when the project is saved, GMS lists the unsupported packages in the name file and copies the unsupported package files from the old directory to the new directory.

Global Options & Output

Package/File Name Abrev Name USGS Description Always Req'd? Extension
Name file MFN [1] The MODFLOW name file. GMS uses "mfn" as the extension. Yes *.mfn
Basic Package BAS6 [2] Used to specify the grid dimensions, the computational time steps, and an array identifying which packages are to be used. Yes *.bas
Discretization File DIS [3] The Discretization File is used to specify certain data used in all models. These include, the number of rows, columns and layers, the cell sizes, the presence of Quasi-3D confining beds, the time discretization. Yes *.dis
Output Control OUT1 [4] Controls what information is to be output from MODFLOW and when it is to be output. No *.oc

Flow Packages

Interfaces to four different flow packages are provided in GMS: the block centered flow (BCF), the layer property flow (LPF), the hydrogeologic unit flow (HUF), and the upstream weighting (UPW) packages. One of these four packages must be selected in the Packages dialog.

Package Name Abrev Name USGS Description Always Req'd? Extension
Block Centered Flow Package BCF6 [5] Performs the cell by cell flow calculations. The input to this package includes layer types and cell attributes such as storage coefficients and transmissivity. Parameters for sensitivity analysis or parameter estimation are NOT supported. Yes1 *.bcf
Layer Property Flow Package LPF [6] Performs the cell by cell flow calculations. The input to this package includes layer types and cell attributes such as storage coefficients and transmissivity. Yes1 *.lpf
Upstream Weighting Flow Package UPW [7] Based on the LPF package. Modified to provide a linear formulation that can be used with the NWT solver. Yes1 *.upw
Hydrogeologic Unit Flow Package HUF [8] Defines the model stratigraphy in a grid independent fashion (in the vertical direction). Yes1 *.huf

1 One of the flow packages must be used.

Solver Packages

Package Name Abrev Name USGS Description Always Req'd? Extension
Geometric Multi-Grid GMG [9] The Geometric Multigrid Solver is used to solve the finite difference equations in each step of a MODFLOW stress period. Yes1 *.gmg
Strongly Implicit Procedure SIP [10] The Strongly Implicit Procedure package is used to solve the finite difference equations in each step of a MODFLOW stress period. Yes1 *.sip
Preconditioned Conjugate Gradient Method PCG2 [11] The Preconditioned Conjugate-Gradient package is used to solve the finite difference equations in each step of a MODFLOW stress period. Yes1 *.pcg
Slice-Successive Overrelaxation Method SOR [12] The Slice-Successive Overrelaxation package is used to solve the finite difference equations in each step of a MODFLOW stress period. Yes1 *.sor
Algebraic MultiGrid for Systems Solver SAMG or LINK-AMG [13] The Link-AMG package is used to solve the finite difference equations in each step of a MODFLOW stress period. Yes1 *.lmg
Direct Solver DE4 [14] The DE4 package is used to solve the finite difference equations in each step of a MODFLOW stress period. Yes1 *.de4
Newton Solver NWT [15] The NWT package is used to solve the finite difference equations in each step of a MODFLOW-NWT stress period. Yes1 *.nwt

1 One of these solvers must be selected in the Packages dialog.

Once a solver has been selected, the appropriate solver package dialog can be accessed through one of the solver commands (LMG, SIP, PCG2, or SSOR) in the MODFLOW menu. The default values shown in each dialog are typically adequate.

For more information on Solver Packages visit: http://water.usgs.gov/nrp/gwsoftware/modflow2000/MFDOC/index.html

Optional Packages

Package Name Abrev Name USGS Description Always Req'd? Extension
Drain Package DRN1 [16] Simulates drain type boundary conditions. No *.drn
Drain Return Package DRT1 [17] Simulates drain return type boundary conditions. No *.drt
Evapotranspiration Package EVT1 [18] Simulates the effect of evapotranspiration in the vadose zone. No *.evt
Evapotranspiration Segments Package ETS1 [19] "allows simulation of evapotranspiration with a user-defined relation between evapotranspiration rate and hydraulic head."[1] No *.ets
Gage Package GAGE [20] Allows SFR and lake gaging stations. Gaging station prints time series values for gage location. No *.gag
General Head Boundary Package GHB1 [21] Simulates a general purpose head-dependent source/sink. Commonly used to simulate lakes. No *.ghb
Horizontal Flow Barrier Package HFB1 [22] Simulates the effect of horizontal flow barriers such as sheet piles and slurry trenches. No *.hfb
Lake Package LAK3 [23] A more sophisticated alternative to the typical approach of using the General head package to simulate the effect of lakes and reservoirs. Computes the stage based on the water budget unlike the GHB. No *.lak
MNW1 Package MNW1 [24] older revision of MNW package used to simulate wells that extend over more than one cell. No *.mnw
MNW2 Package MNW2 [25] updated revision of MNW1 package used to simulate wells that extend over more than one cell. No *.mnw2
Recharge Package RCH1 [26] Simulates recharge to the groundwater from precipitation. No *.rch
River Package RIV1 [27] Simulates river type boundary conditions. No *.riv
SFR Package SFR2 [28] Simulates the exchange of water between the aquifer and surficial streams. Includes routing and automatic computation of stage. Parameters for sensitivity analysis or parameter estimation are NOT supported. No *.sfr
STR Package STR1 [29] Simulates the exchange of water between the aquifer and surficial streams. Includes routing and automatic computation of stage. Parameters for sensitivity analysis or parameter estimation are NOT supported. No *.str
Time Variant Specified Head Package CHD1 [30] Simulates specified head boundary conditions where the head is allowed to vary with time. No *.chd
Well Package WEL1 [31] Simulates injection/extraction wells. No *.wel
UZF Package UZF1 [32] Simulate percolation of water through the unsaturated zone. No *.uzf

Other Files

Other files that GMS reads and writes with MODFLOW simulations.

File Name Description Extension
MFS MODFLOW "Super" file, created by GMS to keep track of extra information GMS needs. *.mfs
MFS MODFLOW World file, created by GMS to keep track of the geographic location of a MODFLOW model. *.mfw
PRJ Projection file in ArcGIS well-known text format specifying a geographic coordinate system. *.prj
H5 An HDF5 formatted file containing array and list data referenced from other package files. See MODFLOW_with_HDF5 for more information *.h5
ASP A file used with a special version of MODFLOW modified to use PEST. *.asp
PARAM Extra information about the parameters used by GMS and our modified version of MODFLOW. *.param
M2P Used by MF2PEST.EXE program. *.m2p

Output Files

Standard Extensions for OUTPUT files.

Package Extension
*.ccf
Drawdown *.drw
Global *.glo
Head *.hed
Output *.out

If a fort.# file occurs the MODFLOW file was written to the given unit number.

If a file has an underscore (*_...) followed by an extension refer to pages 29 and 30 of the MODFLOW Documentation linked here:MF2K Obs-Sen-Pes

Notes

  1. ^ Banta, Edward R. (2000), MODFLOW-2000, The U.S. Geological Survey Modular Ground-Water Model-Documentation of Packages for Simulating Evapotranspiration with a Segmented Function (ETS1) and Drains with Return Flow (DRT1). Open-File Report 00-466., Denver, Colorado, http://water.usgs.gov/nrp/gwsoftware/modflow2000/ofr00-466.pdf 


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