MODFLOW Ground-Water Model - User Guide to the Subsidence and Aquifer-System Compaction Package (SUB-WT) for Water-Table Aquifers

Techniques and Methods 6-A23
Prepared in Cooperation with the Central Arizona Water Conservation District
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Abstract

A new computer program was developed to simulate vertical compaction in models of regional ground-water flow. The program simulates ground-water storage changes and compaction in discontinuous interbeds or in extensive confining units, accounting for stress-dependent changes in storage properties. The new program is a package for MODFLOW, the U.S. Geological Survey modular finite-difference ground-water flow model. Several features of the program make it useful for application in shallow, unconfined flow systems. Geostatic stress can be treated as a function of water-table elevation, and compaction is a function of computed changes in effective stress at the bottom of a model layer. Thickness of compressible sediments in an unconfined model layer can vary in proportion to saturated thickness.

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title MODFLOW Ground-Water Model - User Guide to the Subsidence and Aquifer-System Compaction Package (SUB-WT) for Water-Table Aquifers
Series title Techniques and Methods
Series number 6-A23
DOI 10.3133/tm6A23
Edition Version 1.0
Year Published 2007
Language ENGLISH
Publisher Geological Survey (U.S.)
Contributing office(s) Arizona Water Science Center
Description vi, 42 p.
Larger Work Type Report
Larger Work Subtype USGS Numbered Series
Larger Work Title Chapter 23 of Section A, Ground Water, of Book 6, Modeling Techniques