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An examination of rapid, centrifuge physical modeling studies of contaminant movement in freezing soil

Published online by Cambridge University Press:  27 October 2009

Deborah J. Goodings
Deborah J. Goodings
Affiliation:
Department of Civil Engineering, University of Maryland, College Park, MD 20742, USA
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Abstract

This paper reviews the complex factors interacting in the movement of contaminants in soil subject to seasonal freezing. This includes those relevant to the soil itself, the contaminant itself, and environmental factors, all of which must be understood for prediction and effective design of remediation. Numerical modelers, as well as laboratory researchers examining behavior of small elements of the soil system, require reliable information on the range of full-scale system responses, but it is not feasible to acquire this by full-scale tests. Even field workers benefit from this information in planning data collection. Small physical models of contaminants moving through soil have routinely been limited in their usefulness because of differences in model fluid pressures and soil stresses, compared to full-scale conditions. However, small-scale centrifuge modeling presents the opportunity to produce correct and rapid physical simulation of full-scale system response using field soil and real contaminants, under the range of different boundary conditions. This paper discusses the existing recent centrifuge modeling work that supports the thesis that the technique can be applied to understanding and analyzing this complex problem. Five studies are reviewed: one on simulation of soil freezing effects in the absence of contaminants; three on the simulation of contaminant movement through saturated and unsaturated unfrozen soil, and heat transport effects through the fluid phase of unfrozen soils; and one that simulates the combination of contaminant movement in freezing soil.

Type
Articles
Information
Polar Record , Volume 35 , Issue 192 , January 1999 , pp. 11 - 18
Copyright
Copyright © Cambridge University Press 1999

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