User's guide of Proceessing Modflow 5.0

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282 Processing Modflow 6.5.4 Cut-off Wall Folder: \pm5\examples\geotechniques\geo4\ Overview of the Problem As shown in Fig. 6.53, a highly contaminated area is located in the first stratigraphic unit of an unconfined aquifer. To the west and east of the aquifer exist fixed-head bounaries with the hydraulic head h = -0.4 m and +0.5 m. The aquifer consists of five stratigraphic units. Each unit is horizontally isotropic with uniform thickness. The elevations and horizontal hydraulic conductivities are illustrated in Fig. 6.53. The vertical hydraulic conductivities are assumed to be a tenth of the horizontal hydraulic conductivities. The effective porosity of the aquifer is -8 0.15. The recharge rate is 1 × 10 m/s. Because of the unpayable cost, the contaminants cannot be removed. Your task is to develop a strategy to isolate the contamination. There are four steps to be done. 1. Construct a groundwater flow model and perform a steady-state flow simulation by using the data given above and the model grid given in Fig. 6.53. 2. Geotechnical measures, such as cut-off wall, impervious cover, drain etc., can be considered as an alternative. Calculate flowlines for the case that a cut-off wall has been built to a depth of -8m and the recharge rate within the cut-off wall is reduced to zero by an impervious cover. The location of the cut-off wall is given in Fig. 6.53. When calculating the flowlines, particles should be started from the contaminated area. 3. Repeat step 3 for the case that the cut-off wall reaches the depth -10m. 4. Use a pumping well located in the cell [6, 12] to capture the contaminants. Calculate the required pumping rate and penetration depth. Modeling Approach and Simulation Results The aquifer is simulated using a grid of 5 layers, 23 columns and 23 rows. All layers have the same layer type 3: confined/unconfined (Transmissvity varies). The cut-off wall is modelled by using the Horizontal-flow Barriers package. An impervious cover can be easily simulated by reducing the recharge rate. Fig. 6.54 and Fig. 6.55 show the flowlines by performing forward and backward particle tracking with PMPATH. The particles are initially placed in the center of each cell, which is located in the first model layer and within the cut-off wall. It is obviously that the contaiminants will be “washed out”, even if the cut-off wall is going deeper. The contaminated area can be captured by using a pumping well (located in the cell [6,12]) 6.5.4 Cut-off Wall
Processing Modflow 283 3 penetrated in the first model layer with a pumping rate of 0.0025 m /s. This low pumping rate is possible because of the low groundwater flow velocity. Fig. 6.53 Model grid and boundary conditions 6.5.4 Cut-off Wall
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Processing Modflow A Simulation Sys
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3.6.6 UCODE (Inverse Modeling) . ..
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Preface Welcome to Processing Modfl
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Processing Modflow 1 1. Introductio
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Processing Modflow 3 the three-dime
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Processing Modflow 5 Online Help Th
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Processing Modflow 7 capture zone o
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Processing Modflow 9 The first and
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Processing Modflow 11 Now, you must
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Processing Modflow 13 2. Repeat the
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Processing Modflow 15 2. Choose Lea
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Processing Modflow 19 steps 3 to 5
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Processing Modflow 21 Table 2.4 Out
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Processing Modflow 23 results and u
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Processing Modflow 25 Fig. 2.12 The
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Processing Modflow 31 2.2 Simulatio
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Processing Modflow 33 2. Click OK t
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Processing Modflow 37 Fig. 2.27 Sim
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Processing Modflow 39 < To assign t
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Processing Modflow 47 Note that PMW
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Processing Modflow 49 the model dat
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Processing Modflow 51 PMWIN will cr
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Processing Modflow 53 Table 3.1 An
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Processing Modflow 55 data and clic
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Processing Modflow 61 3.2.2 The Zon
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Processing Modflow 67 - Print: Prin
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Processing Modflow 69 principal axe
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Processing Modflow 71 Calculated, P
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Processing Modflow 73 3.5 The Param
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Processing Modflow 75 steady state
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Processing Modflow 77 Vertical Hydr
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Processing Modflow 79 3.6 The Model
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Processing Modflow 81 RET ' RETM h>
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Processing Modflow 83 boundaries be
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Processing Modflow 85 For a confine
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Processing Modflow 87 1. Recharge i
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Processing Modflow 89 Leakage betwe
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Processing Modflow 91 For the case
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Processing Modflow 93 < Parameter N
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Processing Modflow 95 MODFLOW < Tim
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Processing Modflow 97 MODFLOW < Wet
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Processing Modflow 99 well cell etc
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Processing Modflow 101 MODFLOW < So
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Processing Modflow 103 < Max. band
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Processing Modflow 107 MODFLOW < Ru
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Processing Modflow 109 Table 3.4 Ve
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Processing Modflow 111 MOC3D < Init
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Processing Modflow 113 MOC3D < Disp
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Processing Modflow 115 MOC3D < Stro
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Processing Modflow 117 Table 3.6 Na
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Processing Modflow 119 Fig. 3.40 Th
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Processing Modflow 121 higher numbe
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Processing Modflow 123 )t # Fixed p
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Processing Modflow 125 MT3D < Chemi
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Processing Modflow 127 beginning of
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Processing Modflow 129 < Misc.: - C
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Processing Modflow 131 3.6.4 MT3DMS
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Processing Modflow 133 < Weighting
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Processing Modflow 137 (ITER1): The
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Processing Modflow 139 3.6.5 PEST (
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Processing Modflow 141 define the e
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Processing Modflow 143 while s and
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Processing Modflow 145 - DERINCMUL:
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Processing Modflow 147 where N is t
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Processing Modflow 149 course of an
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Processing Modflow 151 PEST (Invers
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Processing Modflow 153 3.6.6 UCODE
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Processing Modflow 155 To define a
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Processing Modflow 157 < Options -
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Processing Modflow 159 Fig. 3.57 Th
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Processing Modflow 161 < To load an
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Processing Modflow 163 Use the Sear
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Processing Modflow 165 < Appearance
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Processing Modflow 167 - Ignore ina
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Processing Modflow 169 Maps... Fig.
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Processing Modflow 173 4. The Advec
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Processing Modflow 175 where z 3 -1
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Processing Modflow 177 all velocity
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Processing Modflow 189 Particle Tra
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Processing Modflow 193 4.4 PMPATH O
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Processing Modflow 195 Particles To
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Processing Modflow 201 EPA, and bey
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Processing Modflow 203 Fig. 5.5 Sea
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Processing Modflow 205 5.4 The Resu
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Processing Modflow 207 5.5 The Wate
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Processing Modflow 211 6. Examples
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Processing Modflow 213 Step1: Creat
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Processing Modflow 223 in this case
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Processing Modflow 229 3. Leave the
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Page 325 and 326: Processing Modflow 319 8. Reference
Page 327 and 328: Processing Modflow 321 Franke, R. (
Page 329 and 330: Processing Modflow 323 Leake, S.A.
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