GMS:MODFLOW-NWT
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| MODFLOW | |
| Pre-processing | |
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| Building a MODFLOW Model | |
| 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, PCG2, SAMG, SIP, SOR |
| Other: | BAS6, CHD1, DRN1, DRT1, EVT1, ETS1, GAGE, GHB1, HFB1, HUF, LAK3, MNW1, MNW2, OUT1, RCH1, RIV1, SFR2, STR1, WEL1, UZF1 |
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This contains information about functionality available starting at GMS version 8.2. The content may not apply to other versions. |
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Starting at GMS version 8.2, GMS supports MODFLOW-NWT. MODFLOW-NWT is a version of MODFLOW based on MODFLOW-2005 that provides a different formulation of the groundwater flow equation designed to solve models that are non-linear due to unconfined cells or non-linear boundary conditions.
Choosing MODFLOW Version
Choosing to use MODFLOW 2000, MODFLOW 2005, or MODFLOW-NWT is done in the MODFLOW Global Options Dialog. At any time you can switch from one to the other.
Changes to MODFLOW 2005
Source code differences between MODFLOW 2005 and MODFLOW-NWT.
- 1. UPW Package
- The Upstream Weighting package (UPW) is the flow package used with MODFLOW-NWT. The UPW package is only used with the NWT Solver Package.
- 2. NWT Solver
- MODFLOW-NWT contains the NWT solver package. The NWT solver must be used when using the UPW flow package.
- 3. WEL Package
- The WEL package was modified to add an option to decrease the pumping rate as the head drops below a user-specified percentage of cell thickness. The new option is called PHIRAMP.
- 4. SFR Package
- The SFR package is modified to avoid removing water from dry cells and to calculate derivatives for the Newton formulation.
- 5. UZF Package
- The UZF package is modified to avoid removing water from dry cells and to calculate derivatives for the Newton formulation.
- 6. Other Packages
- Poor input values for other packages can result in convergence failure. For example, an EVT extinction depth below the cell bottom elevation can result water being improperly removed from a dry cell.
GMS - Groundwater Modeling System | |
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| Modules: | 2D Grid · 2D Mesh · 2D Scatter Point · 3D Grid · 3D Mesh · 3D Scatter Point · Boreholes · GIS · Map · Solid · TINs |
| Models: | ADH · ART3D · FEMWATER · MODAEM · MODFLOW · MODPATH · MT3DMS · PEST · RT3D · SEAM3D · SEAWAT · SEEP2D · T-PROGS · UTCHEM · UTEXAS · ZONEBUDGET |
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