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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260 Processing <strong>Modflow</strong><br />
Modeling Approach and Simulation Results<br />
The aquifer is simulated using five model layers, 21 rows and 25 columns. The thickness <strong>of</strong><br />
each model layer is 20 m. The elevation <strong>of</strong> the top <strong>of</strong> the first model layer is 100m. A regular<br />
grid space <strong>of</strong> 100 m is used for each column and row. The layer type 3: confined/unconfined<br />
(transmissvitiy varies) is used for every layer.<br />
For task #1, the cells within the mining site in the 4th model layer are set as fixed-head cells<br />
with the initial hydraulic head <strong>of</strong> 21m. The cells (<strong>of</strong> all 5 layers) at the west boundary are fixed-<br />
head cells with the initial head h = 100m. The cells (<strong>of</strong> the layers 3 to 5) at the east boundary are<br />
fixed-head cells with the initial head h = 50m. The initial hydraulic head at all other cells has<br />
been set at 100m. To ensure that there are on resistance to the groundwater flow within the<br />
mining site, a very high value (say 1 m/s) is used for the vertical and horizontal hydraulic<br />
conductivities <strong>of</strong> the cells within the site.<br />
A steady-state flow simulation was performed. Fig. 6.33 shows the two cross-sections and<br />
the head contours <strong>of</strong> layer 4. It is obviously that the cells above the groundwater surface went<br />
dry. To calculate inflow inflow into the mining site, we select Tools< Water Budget... to<br />
calculate the water budget by assigning zone 1 to the fixed-heads cells within the mining site.<br />
The water budget for the zone 1 in layer 4 should look like Table 6.1. The inflow rate to the<br />
3<br />
constant head cells (mining site) is 1.1209306E+00 m /s.<br />
Table 6.1 Water budget for the mining site<br />
ZONE 1 IN LAYER 4<br />
FLOW TERM IN OUT IN-OUT<br />
STORAGE 0.0000000E+00 0.0000000E+00 0.0000000E+00<br />
CONSTANT HEAD 0.0000000E+00 1.1209306E+00 -1.1209306E+00<br />
HORIZ. EXCHANGE 6.1416829E-01 0.0000000E+00 6.1416829E-01<br />
EXCHANGE (UPPER) 0.0000000E+00 0.0000000E+00 0.0000000E+00<br />
EXCHANGE (LOWER) <strong>5.0</strong>676227E-01 0.0000000E+00 <strong>5.0</strong>676227E-01<br />
WELLS 0.0000000E+00 0.0000000E+00 0.0000000E+00<br />
DRAINS 0.0000000E+00 0.0000000E+00 0.0000000E+00<br />
RECHARGE 0.0000000E+00 0.0000000E+00 0.0000000E+00<br />
ET 0.0000000E+00 0.0000000E+00 0.0000000E+00<br />
RIVER LEAKAGE 0.0000000E+00 0.0000000E+00 0.0000000E+00<br />
HEAD DEP BOUNDS 0.0000000E+00 0.0000000E+00 0.0000000E+00<br />
STREAM LEAKAGE 0.0000000E+00 0.0000000E+00 0.0000000E+00<br />
INTERBED STORAGE 0.0000000E+00 0.0000000E+00 0.0000000E+00<br />
SUM OF THE LAYER 1.1209306E+00 1.1209306E+00 0.0000000E+00<br />
For task #2, all cells within the mining site are set as active cells. The wetting capability <strong>of</strong><br />
MODFLOW is turned on by selecting Models < <strong>Modflow</strong>
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