User's guide of Proceessing Modflow 5.0

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266 Processing Modflow Table 6.5 Optimized parameter values and the correlation coefficient matrix. Calibration result from UCODE. PARAMETER ID: P1 P2 UPPER 95% C.I. 1.01E-02 2.01E-08 FINAL VALUES 1.00E-02 2.00E-08 LOWER 95% C.I. 9.90E-03 1.98E-08 ---------------- CORRELATION MAT. ---------------- 1 2 ............................. 1 1.000 0.9869 2 0.9869 1.000 6.4.1 Basic Model Calibration Skill with PEST/UCODE
Processing Modflow 267 6.4.2 Estimation of Pumping Rates Folder: \pm5\examples\calibration\calibration2\ Overview of the Problem This example involves the encapsulation of a highly contaminated area. The aquifer in which the contaminated area is buried is unconfined, isotropic and of infinite area extent. The extent of contamination area is about 65 m × 65 m. The head in the center of this area is about 9.45 m. The elevation of the aquifer top is 10 m and the aquifer bottom is 0 m. The hydraulic -4 conductivity is uniformly 3×10 m/s. The unconfined storage coefficient (specific yield) is 0.2. Recharge is assumed to be zero. The groundwater flow is directed from west to east with a hydraulic gradient of 0.5‰. To prevent contaminated water flow out of the area, a remediation measure is required. Different types and combinations of measures can be introduced for this purpose including a cut-off wall around the area, drainages and pumping wells. All measures are directed to the same goal - a reduction of the piezometric head in the area itself such that groundwater flows towards the contaminated area. To achieve this objective, a cut-off wall around this area and four pumping wells have been chosen. The cut-off wall is 0.5 m thick and the hydraulic -8 conductivity of the material is 5×10 m/s. Your task is to estimate the required pumping rate of the wells such that the steady-state piozometric head in the center of the contaminated area is 8 m. Furthermore, the duration until he steady-state is reached should be calculated. Modeling Approach and Simulation Results The aquifer is simulated using a grid of one layer, 31 columns and 31 rows. The layer type is 1:unconfined. Fig. 6.36 shows the model grid and the select boundary conditions. The extent of the model is fairly large. To obtain the hydraulic gradient of 0.5‰, the west and east sides of the model are assumed to be fixed-head boundaries with hydraulic heads of 9.8925 and 9 m, respectively. The configuration of the remediation measures is shown in Fig. 6.37. The pumping rates of the wells are defined as an estimated parameter by assigning the parameter number 1 to all four wells. An "observation" borehole is set at the center of the contaminated area. The "observed" head at time 1 is set at 8 m (the remediation objective) in the Bohreholes and Observations dialog box. The simulation time is also set to 1. Using PEST or UCODE, the pumping rate of 6.4.2 Estimation of Pumping Rates
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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 17 simulation is
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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 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 139 3.6.5 PEST (
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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 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 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 317 Table 7.2 IU
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Processing Modflow 319 8. Reference
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Processing Modflow 321 Franke, R. (
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Processing Modflow 323 Leake, S.A.
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Processing Modflow 325 Shepard, D.,
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