GMS:MODFLOW-NWT
From XMS Wiki
| 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: | SMS |
| Other: | 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
- 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 | ||
|---|---|---|
| Modules: | 2D Grid • 2D Mesh • 2D Scatter Point • 3D Grid • 3D Mesh • 3D Scatter Point • Boreholes • GIS • Map • Solid • TINs • UGrids |  |
| Models: | FEFLOW • FEMWATER • HydroGeoSphere • MODAEM • MODFLOW • MODPATH • mod-PATH3DU • MT3DMS • MT3D-USGS • PEST • PHT3D • RT3D • SEAM3D • SEAWAT • SEEP2D • T-PROGS • ZONEBUDGET | |
| Aquaveo | ||
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