Skip to main content
Article
Deformation of Debris-Ice Mixtures
Reviews of Geophysics
  • Peter Lindsay Moore, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
9-1-2014
DOI
10.1002/2014RG000453
Abstract
Mixtures of rock debris and ice are common in high-latitude and high-altitude environments and are thought to be widespread elsewhere in our solar system. In the form of permafrost soils, glaciers, and rock glaciers, these debris-ice mixtures are often not static but slide and creep, generating many of the landforms and landscapes associated with the cryosphere. In this review, a broad range of field observations, theory, and experimental work relevant to the mechanical interactions between ice and rock debris are evaluated, with emphasis on the temperature and stress regimes common in terrestrial surface and near-surface environments. The first-order variables governing the deformation of debris-ice mixtures in these environments are debris concentration, particle size, temperature, solute concentration (salinity), and stress. A key observation from prior studies, consistent with expectations, is that debris-ice mixtures are usually more resistant to deformation at low temperatures than their pure end-member components. However, at temperatures closer to melting, the growth of unfrozen water films at ice-particle interfaces begins to reduce the strengthening effect and can even lead to profound weakening. Using existing quantitative relationships from theoretical and experimental work in permafrost engineering, ice mechanics, and glaciology combined with theory adapted from metallurgy and materials science, a simple constitutive framework is assembled that is capable of capturing most of the observed dynamics. This framework highlights the competition between the role of debris in impeding ice creep and the mitigating effects of unfrozen water at debris-ice interfaces.
Comments

This article is from Reviews in Geophysics 52 (2014): 435, doi:10.1002/2014RG000453. Posted with permission.

Copyright Owner
John Wiley & Sons, Inc.
Language
en
File Format
application/pdf
Citation Information
Peter Lindsay Moore. "Deformation of Debris-Ice Mixtures" Reviews of Geophysics Vol. 52 Iss. 3 (2014) p. 435 - 467
Available at: http://works.bepress.com/peter_moore/6/