Aquifer Test Modeling: 1st Edition (Hardback) book cover

Aquifer Test Modeling

1st Edition

By William C. Walton

CRC Press

240 pages | 25 B/W Illus.

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pub: 2006-11-15
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Description

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.

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

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

Subject Categories

BISAC Subject Codes/Headings:
SCI026000
SCIENCE / Environmental Science
TEC010030
TECHNOLOGY & ENGINEERING / Environmental / Water Supply