User's guide of Proceessing Modflow 5.0

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290 Processing Modflow 6.6.2 Two-Dimensional Transport in a Uniform Flow Field Folder: \pm5\examples\transport\transport2\ Overview of the Problem In this example, transport of solute injected continuously from a point source in a steady-state uniform flow field should be simulated. The available parameters are listed below: Layer thickness = 10 m Groundwater seepage velocity = l/3 m/day Effective porosity = 0.3 Longitudinal dispersivity = 10 m Ratio of transverse to longitudinal dispersivity = 0.3 3 Volumetric injection rate = 1 m /day Concentration of the injected water = 1000 ppm Your task is to construct a 2D-model and use MT3DMS to calculate the concentration distribution at the end of a 365-day simulation period. Modeling Approach and Simulation Results A numerical model consisting of 46 columns, 31 rows and 1 layer was constructed to simulate the problem. A regular grid space of 10 m is used for each column and row. The configuration of the model is shown in Fig. 6.59. The model layer is simulated as a confined layer. The top and buttom of the model layer is at an elevaiton of 10 m and 0 m, respectively. To simulate the groundwater seepage velocity of 1/3 m/day, fixed-head boundaries (with h = 11 m and h = 10m) are assigned to the west and east side of the model. The horizontal hydraulic conductivity is 45 m/day. The flow field was first calculcated by MODFLOW. The third order TVD scheme was used in the simulation for the advection term; and the GCG solver is used to solve the dispersion term. The contour map of the concentration field at the end of the 365-day simulation period obtained for this example is shown in Fig. 6.60. An analytical solution for this problem is given by Wilson and Miller (1978). The analytical solution is applicable only under the assumption that 1) the aquifer is relatively thin, so that instantaneous vertical mixing can be assumed; 2) the injection rate is insignificant compared with the ambient uniform flow. Fig. 6.61 shows the breakthrough curves at an observation well located 60 m downstream to the injection well. The analytical solution is obtained by using the computer program 6.6.2 Two-Dimensional Transport in a Uniform Flow Field
Processing Modflow 291 (Rausch, 1998) included in the folder \Source\analytical solution\ of the companion CD- ROM. Fig. 6.62 compares the analytical solution with the numerical solution obtained by using the upstream finite difference method. The numerical dispersion is significant when the upstream finite difference method is used to solve the advection term. Fig. 6.59 Configuration of the model and the location of an observation borehole Fig. 6.60 Calculate concentration distribution 6.6.2 Two-Dimensional Transport in a Uniform Flow Field
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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 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 21 Table 2.4 Out
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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 37 Fig. 2.27 Sim
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Processing Modflow 47 Note that PMW
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Processing Modflow 53 Table 3.1 An
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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 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 111 MOC3D < Init
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Processing Modflow 125 MT3D < Chemi
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Processing Modflow 131 3.6.4 MT3DMS
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Processing Modflow 153 3.6.6 UCODE
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Page 327 and 328: Processing Modflow 321 Franke, R. (
Page 329 and 330: Processing Modflow 323 Leake, S.A.
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