Full Migration Procedure for Data Prepared for VS2DT 2.5

For data originally prepared for VS2DT 2.5, the full migration procedure requires:

• modifying the model data file
• creating a namelist file

The model data file must be modified as follows.

• After "Card B-5", insert an extra line containing 2 integers separated by one or more spaces. The first integer indicates the type of hydraulic characteristic function to be used. The options are:
  0 - Brooks Corey
  1 - van Genuchten
  2 - Haverkamp
  3 - tabular data
  
  The second integer indicates the type of adsorption or ion exchange. The options are:
  1 - no adsorption, no ion exchange
  2 - by Langmuir isotherm
  3 - Freundlich isotherm
  4 - Monovalent-monovalent ion exchange
  5 - Monovalent-divalent ion exchange
  6 - Divalent-monovalent ion exchange
  7 - Divalent-divalent ion exchange
  
• If the van Genuchten hydraulic characteristic function is used, replace the 5th parameter in "Card B-7", alpha-prime, by the inverse of its absolute value, alpha. VS2DT 3.0 now uses the definition for alpha as it was originally proposed by van Genuchten (1980). (For example, if the original value is -25, it should be replaced as 0.04.) See revised van Genuchten formula for the equations used in VS2DT 3.0.
• Replace "99999" by "-99999" (Card C-13).

The namelist file must contain the following 9 lines. The commonly used file names are indicated in parentheses.

1. The name of the model data file (vs2dt.dat).
2. The name of the main output file (vs2dt.out).
3. The name of the auxiliary output file containing maximum head change for each time step (file07.out).
4. The name of the auxiliary output file containing heads and concentrations at selected times (file08.out).
5. The name of the auxiliary output file containing selected fluid and solute balance components at each time step (file09.out)
6. The name of the auxiliary output file containing heads, concentrations, etc. for selected observation points at each time step (file11.out).
7. If initial pressure heads or moisture contents are specified in an array, then enter the name of the file containing this array. (If this array is in the model data file, repeat line 1 here.) If initial pressure heads or moisture contents are not specified in an array, then skip this line. (Do not enter a blank line.)
   
8. If initial concentrations are specified in an array, then enter the name of the file containing this array. (If this array is in the model data file, repeat line 1 here.) If initial concentrations are not specified in an array, then skip this line. (Do not enter a blank line.)
9. The line containing "# vs2dt3.0" (without quotes). This is always the last line of the namelist file.

Note: The namelist file must be placed in the same directory as the model data file.

To view sample files after full migration, please click on the following:

• vs2dt1.dat (model input file)
• vs2dt.fil (namelist file)

Return to:

• Run a simulation using input data previously prepared for VS2DT 2.5