GMS:Calculate Mass

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Example of the MT3DMS Calculate Mass dialog.

The MT3DMS Calculate Mass dialog allows the calculation of the mass of a contaminant in the entire model domain or in the selected cells. At the top of the dialog, the MODFLOW Heads and MT3DMS Conc... buttons bring up a Select Dataset dialog where the head and concentration datasets can be selected. All time steps in the datasets can be used or specific time steps can be selected.

Definition

Explains the formula that is used to calculate the mass. Basically, the volume of water in each cell is calculated and then multiplied by the concentration computed by MT3DMS. A conversion factor must be supplied so that the calculated mass will be computed in the correct units.

Concentration Range

Allows the specification a range over which the mass will be calculated. This is most useful to ignore negative concentrations that result in MT3DMS simulations.

Conversion Factor

The factor determines which units the resulting mass will be displayed in.