Aquifer Test Modeling
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Summary
In recognition of the trend toward using numerical methdos for analyzing aquifer test data, Aquifer Test Modeling delineates the application of numerical Laplace inversion analytical equations and numerical models and demonstrates the use of public domain software. Written by a leading expert with over fifty years of experience, this highly practical text provides a thorough grounding in the terms and methods employed in aquifer test modeling, while also establishing a protocol for organizing and simplifying conceptual model definition and data analysis.
Using graphs, tables, and sample datasets to enhance understanding, the author delineates the five major steps involved in the aquifer test modeling process. He discusses the importance of the conceptual model definition as a framework for organizing, simplifying, and idealizing information. The chapters cover the selection of appropriate aquifer test mathematical model equations compatible with previously defined conceptual models and highlight the importance of reviewing the mathematical assumption and the adjustment of data for any departures. They also explain format selection, technique selection, well function or drawdown calculation, and calibration.
The book provides five sample data sets to assist the reader in becoming familiar with WTAQ and MODFLOW aquifer test modeling input and output data file contents with confined nonleaky and unconfined aquifer conditions. It includes conceptual models consisting of abbreviated descriptions of aquifer test facilities, aquifer test data, and aquifer parameter values together with selected sample file sets. These are just a few of the features that make the book a valuable tool for estimating the supply and contamination characteristics of aquifers.
Table of Contents
OVERVIEW
CONCEPTUAL MODEL DEFINITION
Defining Hydrostratigraphic Unit Framework
Defining Analytical Conceptual Models
Heterogeneous and Vertical Anisotropic Conditions
Horizontal Anisotropic Conditions
Well Partial Penetration
Wellbore Storage
Wellbore Skin
Unconfined Aquifers
Hydrogeologic Boundaries
Defining Numerical Conceptual Models
Confining Units
Unconfined Aquifers
Hydrogeologic Boundaries
Quantifying Hydraulic Characteristics
Defining Well Characteristics
Defining Aquifer Test Domain Radius
Defining Time Dimensions
Groundwater and Surface Water Budgets
Flow System External Influences
Conceptual Model
MATHEMATICAL MODELING EQUATION AND SOFTWARE SELECTION
Analytical Mathematical Model Equations
Integral and Empirical Mathematical Equations
Stehfest Algorithm Pumping Test Mathematical Modeling Equations
Stehfest Algorithms Slug Test Mathematical Modeling Equations
Horizontal Anistropy
Horizontal Heterogeneity
Image Well Theory
Numerical Mathematical Model Equations
Finite-Difference Approximation Method
Software Selection
EXTERNAL INFLUENCE DATA ADJUSTMENT
Confined Aquifer Barometric Efficiency
Unconfined Aquifer Barometric Efficiency
Barometric Efficiency Calibration
Stream Stage Adjustments
Tidal Fluctuations Adjustments
Dewatering Adjustments
DATA ANALYSIS
Format Selection
Technique Selection
Single Plot Type Curve Matching with Interactive Calibration
Single Plot Straight-Line Matching with Interactive Calibration
Composite Plot Matching with Interactive Calibration
Composite Plot Automatic Parameter Estimation
Well Function or Drawdown/Head Calculation
Calibration
Interactive Calibration
Automatic Parameter Estimation
Time Drawdown
Time-Recovery
Specific Capacity
Step Drawdown
Time-Discharge Constant Drawdown
Boundary Data
MODFLOW Simulation
About MODFLOW Versions
Pumped Well Drawdown
Multilayer Pumped Well
Wellbore Storage
Delayed Gravity Drainage
Grid Design
Time Design
Transient Confining Unit Leakage
Spatial Parameter Difinition
Streamlined-Induced Infiltration
Dimensionless Time Drawdown
EVALUATION
SAMPLE DATA FILE SETS
REFERENCES
APPENDIX A. NOTATION
Editorial Reviews
"This text provides a thorough grounding … The book is a valuable tool for estimating the supply and contamination characteristics of aquifers."
—The Journal of the American Water Resources Association, August 2008
