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David W. Pollock

United States Geological Survey

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Publication

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Ground Water | 2016

Extending the MODPATH Algorithm to Rectangular Unstructured Grids

David W. Pollock

The recent release of MODFLOW-USG, which allows model grids to have irregular, unstructured connections, requires a modification of the particle-tracking algorithm used by MODPATH. This paper describes a modification of the semi-analytical particle-tracking algorithm used by MODPATH that allows it to be extended to rectangular-based unstructured grids by dividing grid cells with multi-cell face connections into sub-cells. The new method will be incorporated in the next version of MODPATH which is currently under development.

Open-File Report | 1994

User's Guide for MODPATH/MODPATH-PLOT, Version 3: A particle tracking post-processing package for MODFLOW, the U. S. Geological Survey finite-difference ground-water flow model

David W. Pollock

Ground Water | 1988

Semianalytical Computation of Path Lines for Finite‐Difference Models

David W. Pollock

Water Resources Research | 1989

Gas transport in unsaturated zones: Multicomponent systems and the adequacy of Fick's laws

Donald C. Thorstenson; David W. Pollock

Ground Water | 1998

A controlled experiment in ground water flow model calibration

Mary C. Hill; Richard L. Cooley; David W. Pollock

Water Resources Research | 1986

SIMULATION OF FLUID FLOW AND ENERGY TRANSPORT PROCESSES ASSOCIATED WITH HIGH-LEVEL RADIOACTIVE WASTE DISPOSAL IN UNSATURATED ALLUVIUM.

David W. Pollock

Ground Water | 1997

Patterns and Age Distribution of Ground‐Water Flow to Streams

Edward Modica; Thomas E. Reilly; David W. Pollock

Ground Water | 1996

Sources of Water to Wells for Transient Cyclic Systems

Thomas E. Reilly; David W. Pollock

Water Supply Paper | 1993

Factors affecting areas contributing recharge to wells in shallow aquifers

Thomas E. Reilly; David W. Pollock

Ground Water | 1991

Particle Tracking Analysis of Recharge Areas on Long Island, New York

Herbert T. Buxton; Thomas E. Reilly; David W. Pollock; Douglas A. Smolensky

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Thomas E. Reilly

United States Geological Survey

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Donald C. Thorstenson

United States Geological Survey

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Douglas A. Smolensky

United States Geological Survey

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Edward Modica

United States Geological Survey

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Herbert T. Buxton

United States Geological Survey

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Mary C. Hill

United States Geological Survey

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Richard L. Cooley

United States Geological Survey

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