User:Tswensen/mdt package: Difference between revisions
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{{MODFLOW Links}} | {{MODFLOW Links}} | ||
MODFLOW-USG Transport is a version of MODFLOW that can be used to model groundwater flow and contaminate transport. To | MODFLOW-USG Transport is a version of MODFLOW that can be used to model groundwater flow and contaminate transport. To model the effects of matrix diffusion, it can be paired with the Matrix Diffusion Transport (MDT) package. | ||
:'''''Note:''''' The MDT package is not an official package released by USGS. The MDT package provided with GMS is still being developed and may change in the future. Newer versions of the package may not be compatible with older projects. | :'''''Note:''''' The MDT package is not an official package released by USGS. The MDT package provided with GMS is still being developed and may change in the future. Newer versions of the package may not be compatible with older projects. | ||
The ''MDT Package'' dialog is divided into two parts: one on the left which shows the main sections, and one on the right which shows the inputs for the current section. | The ''MDT Package'' dialog is divided into two parts: one on the left which shows the main sections, and one on the right which shows the inputs for the current section. | ||
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==VARIABLES== | ==VARIABLES== | ||
* ''IMDTCB'' – | The ''Variables'' tab outlines key parameters and controls related to mass flux, immobile domain concentration, hydraulic conductivity, and matrix diffusion in flow simulations. | ||
* ''IMDTCF'' – | * ''Cell-by-cell mass flux unit (IMDTCB)'' – Controls whether cell-by-cell mass flux terms are written to a specified unit number or listing file. | ||
* ''FRAHK'' – | * ''Immobile domain concentration unit (IMDTCF)'' – Controls whether matrix coefficients and immobile domain concentrations are saved to a specified unit number or the listing file. | ||
* ''FRADARCY'' – Darcy flux hydraulic conductivity | * ''Hydraulic conductivity for fracture only (FRAHK)'' – Specifies whether the hydraulic conductivity and storage terms apply only to the fracture (mobile) domain or to the entire medium during flow simulations. | ||
* ''TSHIFTMD'' – | * ''Darcy flux hydraulic conductivity for fracture only (FRADARCY)'' – Specifies that the Darcy flux is computed only for the fracture domain, with hydraulic conductivity adjusted by the fracture volume fraction, and storage terms apply only to the fracture domain. | ||
* ''tshift'' – | * ''Shift matrix diffusion start time (TSHIFTMD)'' – Indicates that the MODFLOW start time is not the start time for matrix diffusion, and the variable TSHIFT represents the time elapsed since matrix diffusion began; the AIOLD1MD and AIOLD2MD coefficients are also input when TSHIFTMD is used. | ||
* ''Time elapsed since matrix diffusion began (tshift)'' – Represents the time elapsed since matrix diffusion began. | |||
==AQUIFER PROPERTIES== | ==AQUIFER PROPERTIES== | ||
The ''Aquifer Properties'' tab outlines key properties and characteristics related to matrix diffusion, permeability, porosity, and diffusion behavior in the matrix domain during flow simulations. | |||
* ''MDFLAG'' – An integer that controls how matrix diffusion is modeled in the system. | * ''MDFLAG'' – An integer that controls how matrix diffusion is modeled in the system. | ||
* ''VOLFRACMD'' – The portion of a grid cell occupied by a higher permeability material, representing the mobile domain's volume fraction. | * ''VOLFRACMD'' – The portion of a grid cell occupied by a higher permeability material, representing the mobile domain's volume fraction. | ||
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* ''TORTMD'' – The tortuosity of the matrix domain, representing the path that a molecule must travel during diffusion in the low-permeability material. | * ''TORTMD'' – The tortuosity of the matrix domain, representing the path that a molecule must travel during diffusion in the low-permeability material. | ||
[[File:GMS MODFLOW-USG Transport MDT Dialog.png|450px|thumb|right|Example of the ''MDT Package'' dialog.]] | |||
==SPECIES PROPERTIES== | ==SPECIES PROPERTIES== | ||
The ''Species Properties'' tab outlines key aspects of contaminant behavior, decay, diffusion, and concentration integrals in the matrix domain, including adsorption, degradation, and diffusion processes in low-permeability materials. | |||
* ''KDMD'' – The adsorption coefficient in the matrix domain, showing how a contaminant binds to the low-permeability material. | * ''KDMD'' – The adsorption coefficient in the matrix domain, showing how a contaminant binds to the low-permeability material. | ||
* ''DECAYMD'' – The rate at which a substance degrades in the low-permeability material, based on a first-order decay process. | * ''DECAYMD'' – The rate at which a substance degrades in the low-permeability material, based on a first-order decay process. | ||
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==Related Topics== | ==Related Topics== | ||
*[[GMS:MODFLOW | *[[GMS:MODFLOW-USG|MODFLOW-USG]] | ||
{{Navbox GMS}} | {{Navbox GMS}} | ||
[[Category:MODFLOW | [[Category:MODFLOW]] | ||
[[Category:MODFLOW | [[Category:MODFLOW Dialogs]] | ||
[[Category:MODFLOW-USG]] | |||
