GMS:MT3DMS Packages
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MT3DMS is divided into a series of components called "packages." Each package performs a specific task. Some of the packages are always required for a simulation, and some are optional. The input for each package is contained in a separate text file. The MT3DMS packages supported in the GMS interface are listed in the following table:
| Package Name | Abbrev. | Decription | Always Req'd? |
|---|---|---|---|
| Basic Transport Package | BTN | Handles basic tasks that are required by the entire transport model. Among these tasks are definition of the problem, specification of the boundary and initial conditions, determination of the step size, preparation of mass balance information, and printout of the simulation results. | YES |
| Advection | ADV | Solves the concentration change due to advection with one of the three mixed Eulerian-Langrangian schemes included in the package: MOC, MMOC, or HMOC | NO |
| Dispersion | DSP | Solves the concentration change due to dispersion with the explicit finite difference method. | NO |
| Sink & Source Mixing | SSM | Solves the concentration change due to fluid sink/source mixing with the explicit finite difference method. Sink/source terms may include wells, drains, rivers, recharge, and evapotranspiration. The constant-head boundary and general-head-dependent boundary are also handled as sink/source terms in the transport model. | NO |
| Chemical Reactions | RCT | Solves the concentration change due to chemical reactions. Currently, the chemical reactions include linear or nonlinear sorption isotherms and first-order irreversible rate reactions (radioactive decay or biodegradation). | NO |
| Generalized Conjugate Gradient Solver | GCG | This package can be used to implicitly solve the dispersion, source/sink, and reaction terms of the transport equation. | NO |
| Transport Observation | TOB | Outputs concentration at observation points and mass fluxes at groups of source/sink boundary conditions. | NO |
| PHT3D-PHREEQC Interface | PHC | Used by PHT3D to define options for species related to PHREEQC geochemical reactions. | NO |
| Examples of MT3DMS package dialogs | |
|---|---|
| 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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