User:Jcreer/GMS 99.99 Changes

MF 6 MDT Package

Changes to options and grid data

OPTIONS

• SAVE FLOWS – Save flows to budget file.
• PRINT FLOWS – Print flows to listing file.
• SORPTION – Sorption will be activated. Requires that BULK DENSITY and DISTCOEF.
• FIRST ORDER DECAY – First-order decay will occur.
• TSHIFTMD – Time elapsed since matrix diffusion began. Indicates that the MODFLOW start time (t = 0) is not the starting time of matrix diffusion, and the subsequent real variable.
• MD FILEOUT – Write AIOLD1MD and AIOLD2MD coefficients to a binary file.

GRIDDATA

• Griddata – List of available properties.
  • MD_TYPE_FLAG — The matrix diffusion type flag at any location.
  • MD_FRACTION – The immobile fraction at any location, i.e., the fraction of the total space that is occupied by the fracture/high permeability domain.
  • MD_POROSITY – The effective transport porosity at any location.
  • BULK_DENSITY – The dry bulk density of the porous matrix of the matrix domain at any location
  • MD_DIFF_LENGTH – The diffusion length for diffusive transport within the matrix domain at any location (only used for embedded heterogeneity).
  • MD_TORTUOSITY – The tortuosity of the matrix domain at any location.
  • MD_DIST_COEFF – The adsorption coefficient (Kd) of a contaminant species in the immobile domain at any location.
  • MD_DECAY – The first-order decay coefficient in water and on soil (1/time) in the matrix domain at any location.
  • MD_DIFF_COEFF – The diffusion coefficient of each species component within the matrix domain at any location.
  • AIOLD1MD – The concentration integral (equation 8) of each species in an element associated with matrix diffusion into an infinite acting adjacent aquitard (MDFLAG = 1, 3, 4, 5, 6, or 7). This value is used to restart a simulation with prior matrix diffusion.
  • AIOLD2MD – The concentration integral (equation 8) of each species in an element associated with matrix diffusion in low permeability zones that are embedded in the volume element (MDFLAG = 2, 5, 6, or 7). This value is used to restart a simulation with prior matrix diffusion.
• Use Constant – Turn on to enter a constant value.
• Constant Value – Enter a constant value for the property.
• Dataset to Array – Clicking the Dataset to Array will open an array editor dialog for the specific property.

MF6

Add to MODFLOW 6 article

Packages and variables in MODFLOW-USG Transport and their equivalents in MODFLOW 6.

MODFLOW-USG Transport		MODFLOW 6
Package	Variable	Package	Variable
PSB		CNC
BCT	DIFFNC	DSP	DIFFC