MODFLOW Tutorial for Argus ONE
Contents
Introduction
A Simple MODFLOW Problem
A small MODFLOW Example (works with Argus ONE in demo mode)
Example Problem 1. Theis Solution.
Starting a New Project
Geology: Setting up the Layer Structure of the Model
Stresses 1
Time
Output File
Solvers
Creating the Domain Outline
Assigning Aquifer Properties
Assigning Boundary Conditions
Setting the Grid Refinement
Running the Model
Viewing the Model Output
Understanding the Listing File
Plotting the Water Budget Data
More Ways to Display the MODFLOW Output
Summary
Example Problem 2. Representation of Aquitards
Introduction
Non-Spatial Characteristics
Aquifer Characteristics
Using the Expression Editor to set Default Aquifer Properties and to Link Layer Properties
The Uses of Prescribed Heads (Constant Heads)
Extracting Heads and Discharges from the Output Files
Modifying the Model to Show the Effects of Representing the Aquitard with More Layers
Comparing the Results of the 3-Layer and 9-Layer Models
Summary
Example Problem 3, Head-Dependent Boundary Conditions
Introduction
General-Head Boundary
Drain
River
Evapotranspiration
Prescribed Head
Common Characteristics of the Models
Interblock Transmissivity
Setting Up the Grid
Direct Editing of Contours
Setting up a River Boundary
Setting up General-Head Boundary, Drain, and Evapotranspiration Boundaries
Setting Up the Constant Head Boundary
Comparison of Results
Summary
Example Problem 4, A Water Supply Problem
Introduction
Model Characteristics
Importing DXF Files
Resizing the DXF Map
Determining Aquifer Thickness Through Interpolation of Point Values
Transferring Data from the DXF Map to the Model
The Layers Floater
Hiding Contour Values and Labels
Setting Other Model Features
Running the Model and Viewing Results
Summary
Example Problem 5, Landfill
Introduction
Setting Up the Model and Importing data from an existing model
Run the model
Variations on the model
Impervious Cap
Impervious Cap and Slurry Wall
Impervious Cap, Slurry Wall, and Drain
Impervious Cap and Drain
Impervious Cap and Horizontal Flow Barrier
Discussion of Results
Summary
Tips for Using the MODFLOW PIE
References