The TOB: Transport Observation Package pane is is on the MODFLOW Packages and Programs dialog box under MT3DMS or MT3D-USGS. It is used to specify some of the data for the TOB package in MT3DMS or MT3D-USGS.
Note that another sort of observation can be defined as part of the Basic Transport Package. To define those observations, you set the data set MT3DMS_Observation_Locations to True.
inSaveObs—is an integer flag indicating whether the calculated concentrations and mass fluxes at the user-defined observation points and mass-flux objects should be saved to an unformatted (binary) output file [OUTNAM]._PST.
Note that the extension "._PST" is used for the file instead of ".PST" as specified in the MT3D documentation. This is to avoid a conflict with PEST. In PEST, the PEST control file must have the extension ".PST'.
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CScale—is the multiplier (scaling factor) for the observed concentrations. It is used to convert the unit of observed concentrations to the unit of calculated concentrations used internally in MT3DMS for computing appropriate residuals.
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iOutCobs—indicates what type of output should be computed and saved:
If "concentrations" is selected, calculated concentrations at the observation locations are saved to the output file [OUTNAM].OCN;
If "concentrations, residuals" is selected, both calculated concentrations and residual errors between the calculated and observed values are saved to the output file [OUTNAM].OCN. The statistics of the residual errors are also computed and saved.
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iConcLOG—indicates whether the calculated and observed concentrations should be converted to the common logarithm before computing the residual error and related statistics:
If the checkbox is not checked, no conversion is done (residual error = calculated – observed);
If the checkbox is checked, the calculated and observed concentration values are converted to the common logarithmic scale before computing the residual error and related statistics (residual error = log10(Calculated) - log10(Observed)).
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iConcINTP—indicates whether the calculated concentration at an observation location should be interpolated from its neighboring nodal points, if the observation location does not coincide with a nodal point:
If the checkbox is not checked, no interpolation is done (the calculated concentration value at the nearest nodal point is used for comparison with the observed value);
If the checkbox is checked, perform bilinear interpolation using four neighboring nodal concentrations in the same model layer.
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FScale—is the multiplier (scaling factor) for the observed mass flux. It is used to convert the unit of observed mass flux to the unit of calculated mass flux observation used internally in MT3DMS for computing appropriate residuals.
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iOutFlux—indicates what type of output should be computed and saved:
iIf the checkbox is not checked, calculated mass fluxes are saved to the output file [OUTNAM].MFX;
If the checkbox is checked, both calculated mass fluxes and residual errors between the calculated and observed values are saved to the output file [OUTNAM].MFX. The statistics of the residual errors are also computed and saved.
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