An updated model of induced airflow in the unsaturated zone

Water Resources Research
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Abstract

Simulation of induced movement of air in the unsaturated zone provides a method to determine permeability and to design vapor extraction remediation systems. A previously published solution to the airflow equation for the case in which the unsaturated zone is separated from the atmosphere by a layer of lower permeability (such as a clay layer) has been superseded. The new solution simulates airflow through the layer of lower permeability more rigorously by defining the leakage in terms of the upper boundary condition rather than by adding a leakage term to the governing airflow equation. This note presents the derivation of the new solution. Formulas for steady state pressure, specific discharge, and mass flow in the domain are obtained for the new model and for the case in which the unsaturated zone is in direct contact with the atmosphere.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title An updated model of induced airflow in the unsaturated zone
Series title Water Resources Research
DOI 10.1029/94WR02423
Volume 31
Issue 2
Year Published 1995
Language English
Publisher American Geophysical Union
Contributing office(s) Toxic Substances Hydrology Program
Description 5 p.
First page 417
Last page 421