The input to the Dispersion package includes data used for defining dispersion and diffusion coefficients. Some coefficients are defined on a cell-by-cell basis and some are defined on a layer-by-layer basis. The Dispersion Package dialog contains the following options:
The Reset button deletes all of the data currently defined in the Dispersion package and restores the package parameters to the default values.
A ratio of transverse dispersivity to longitudinal dispersivity and a ratio of vertical dispersivity to longitudinal dispersivity are defined on a layer-by-layer basis. These ratios are multiplied by the longitudinal dispersivity array to generate horizontal and vertical dispersion coefficients for each cell.
A molecular diffusion coefficient must also be defined for each layer.
The Longitudinal Dispersivity button is used to set the values for longitudinal dispersivity for the current layer (or for the entire grid). This brings up a spreadsheet dialog similar to the Starting Heads dialog. The dialog can be used to edit the longitudinal dispersivity array directly or to copy in interpolated data sets to the array. This array can be initialized using a conceptual model in the Map module. It can also be edited on a cell-by-cell basis using the Cell Attributes command.
For more information on input values for this package consult the MT3DMS documentation.
Related Links:
Building an MT3DMS Simulation
Packages