User's guide of Proceessing Modflow 5.0
User's guide of Proceessing Modflow 5.0
User's guide of Proceessing Modflow 5.0
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128 Processing <strong>Modflow</strong><br />
data in the Data Editor. Note that Time-Variant Specified-Concentration may not be<br />
supported by some earlier version <strong>of</strong> MT3D.<br />
- Flag [-]. A non-zero value indicates that a cell is specified as a constant concentration cell.<br />
In a multiple stress period simulation, a constant-concentration cell, once defined, will<br />
remain a constant-concentration cell in the duration <strong>of</strong> the simulation, but its concentration<br />
value can be specified to vary in different stress period. To change the concentration value<br />
in a particular stress period, simply set a non-zero value to Flag and assign the desired<br />
concentration value to Specified Concentration.<br />
-3<br />
- Specified Concentration [ML ]. This value is the concentration in the cell from the<br />
beginning <strong>of</strong> a stress period.<br />
MT3D < Output Control...<br />
Use the Output Control (MT3D, MT3DMS) dialog box (Fig. 3.45) to set the output options<br />
from MT3D. The options in this dialog box are grouped under three tabs described below.<br />
< Output Terms: The MT3D transport model always generates a listing file OUTPUT.MT3,<br />
which documents the details <strong>of</strong> each simulation step. Optionally, you can save other output<br />
terms by checking the corresponding output terms in this tab. All output terms denoted by<br />
(ASCII) are also saved in the listing file. The calculated concentration values will be saved<br />
in the unformatted binary file MT3D.UCN. In addition, MT3D96 can save the mass<br />
contained in each cell in the unformatted binary file MT3D.CBM. All output files are<br />
located in the same folder as your model. You can use the Result Extractor to read the<br />
unformatted binary files.<br />
< Output Times: The value <strong>of</strong> the output frequency, NPRS, indicates whether the output is<br />
produced in terms <strong>of</strong> total elapsed simulation time or the transport step number. If NPRS=0,<br />
simulation results will only be saved at the end <strong>of</strong> simulaton. If NPRS0, simulation results will be saved at times as specified in the table as shown in Fig.<br />
3.46. There are two ways for specifying the output times. You may click the table header<br />
Output Time and then enter a minimum time, a maximum time and a time interval between<br />
each output into an Output Time dialog box. PMWIN will use these entries to calculate<br />
NPRS and the output times. The other way is to specify a positive NPRS and press the Tab<br />
Key, then enter the output times into the table. Note that the output times are measured from<br />
the beginning <strong>of</strong> the simulation.<br />
3.6.3 MT3D
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