Difference between revisions of "GMS:MODFLOW-USG"

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==Practical Notes==
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When using MODFLOW-USG to re-wet cells:
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*In the ''MODFLOW SMS Solver'' dialog, the ''Nonlinear solution method'' should be set to one of the two Newton methods.
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*In the ''LPF Package'' dialog, each layer should be set to ''Convertible Upstream'' (this is essentially a Newton layer).
  
 
==External Files==
 
==External Files==

Latest revision as of 14:11, 14 August 2019

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
Post-processing
MODFLOW Display Options
MODFLOW Post-Processing Viewing Options
Reading a MODFLOW Simulation
Tutorials
MODFLOW 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

Starting at GMS version 10.0, GMS supports MODFLOW-USG. MODFLOW-USG is a version of MODFLOW based on finite volume calculations, thus allowing for many different types of grid cells. This allows the model grid to more accurately match the model domain and be more efficiently refined in areas where more accuracy is desired.

MODFLOW-USG models are built using unstructured grids, or UGrids, which are a new (as of GMS 10.0) type of geometric object that can handle the wide variety of cell types supported by MODFLOW-USG.

The MODFLOW-USG model is included with all paid editions of GMS.

Choosing MODFLOW Version

Only MODFLOW-USG is supported when using unstructured grids. MODLFOW-USG can also be used for a model using a 3D grid. Choosing to use MODFLOW-USG is done in the MODFLOW Global/Basic Package dialog. With a 3D grid at any time the user can switch from one MODFLOW version to another.

MODFLOW Global/Basic Package dialog

Unsupported Features

Previous to GMS 10.1 there was no support for the following MODFLOW-USG features, though the CLN and GNC packages and the import feature are now supported in current versions of GMS.

  1. Packages/processes
    • CLN Process
    • GNC Package
  2. Older versions of GMS cannot read MODFLOW-USG files written by any non-GMS software. This is because there was no standard way to define the unstructured grid geometry. GMS writes a *.VTU (Visualization Toolkit unstructured grid) file with the MODFLOW files to define the grid geometry. In GMS 10.1 and later versions a model that was created outside of GMS can be imported as long as there is either a *.vtu file (VTK unstructured grid file) or a *.gsf file (Grid Specification File) present to define the grid geometry because the MODFLOW-USG native input files do not include locations of the grid nodes (unfortunately).

Additionally, PEST-ASP is currently unsupported in MODFLOW-USG

MODFLOW-USG Files

Here are tables of some of the available input and output files for MODFLOW-USG.

  • For more information on these files see the manual
Required Input Files
Name Description
MFN MODFLOW Name File
GLO Global Listing File
DIS Discretization File
OC Process Output Control Option File
BA6 Basic Package Global Options File
Solver Package File
Name Description
SMS Sparse Matrix Solver
Input Flow Package Files
Name Description
BCF Block-Centered Flow
LPF Layer Property Flow
Optional Package Files
Name Description
CHD Time-Variant Specified-Head
DRN Drain
EVT Evapotranspiration
GAG Gage
GHB General Head Boundary
GNC Ghost Node Correction
HFB Horizontal Flow Barrier
LAK Lake
RCH Recharge
RIV River
SFR Streamflow-Routing
STR Stream-Routing
SUB Subsidence
WEL Process Well
Observation Input Files
Name Description
OBS Main Observation Process Input
DROB Drain Observation
CHOB Constant-Head Flow Observation Input
Output Files
Name Description
MFS MODFLOW Super File
MFW GMS MODFLOW World File
MFR GMS MODFLOW Result Index File
PRJ Projection
CSV Cell Summary Comma Separated Value Excel
HFF Head and Flow File Link to MT3DMS
H5 Hierarchal Data Format (HDF5) Array & List Data
M2P MODFLOW Pest
PARAM Parameter Information
Output Results Files
Name Description
CCF Cell-to-Cell Aquifer Flow
CCF2 Cell-to-Cell Stream Reach Outflow
DRW Drawdown
GLO Global Listing
HED Head Output
OUT Output
VTU Visualization Toolkit Unstructured Grid
Output Data Exchange Files
Name Description
_W Weighted Residuals
_WW Weighted Equivalents & Weighted Observation
_WS Weighted Residuals and Simulated Equivalents
_R Unweighted Residuals
_OS Observed Values and Simulated Equivalents
_B Data Exchange File
_NM Weighted Residuals and Probability Plotting

Practical Notes

When using MODFLOW-USG to re-wet cells:

  • In the MODFLOW SMS Solver dialog, the Nonlinear solution method should be set to one of the two Newton methods.
  • In the LPF Package dialog, each layer should be set to Convertible Upstream (this is essentially a Newton layer).

External Files

See also