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Mechanical vibration responses of snow samples near the melting temperature

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Abstract:

Mechanical properties of snow were investigated by means of a vibration response technique in a frequency range from 10 Hz to 1MHz and a temperature range from −15° to −0.1°C with heating and cooling processes. The response signals were divided into two kinds of propagation, transverse and longitudinal waves through the snow sample. The temperature dependence of elastic-wave velocities showed a large decrease above −0.6°C. Poisson's ratio and Young's modulus of snow samples were derived from the longitudinal and transverse wave velocities. Poisson's ratio of snow samples showed a value of 0.35 ± 0.01 below −0.6°C, and dropped to 0.29 or less at −0.1°C.Young's modulus of snow samples at −0.1°C showed values seven-tenths as large as (25–34% less than) those below −0.6°C. These phenomena suggest weakening and slipping of boundaries between ice particles in snow samples near the melting temperature. The elastic-wave velocities and Young's modulus change with the density of samples and with time and temperature cycling. These changes are related to the number and state of bonds between ice particles in snow samples.

Document Type: Research Article

DOI: http://dx.doi.org/10.3189/172756404781815022

Publication date: January 1, 2004

More about this publication?
  • The Annals of Glaciology is a peer-reviewed, thematic journal published 2 to 4 times a year by the International Glaciological Society (IGS). Publication frequency is determined and volume/issue numbers assigned by the IGS Council on a year-to-year basis and with a lead time of 3 to 4 years. The Annals of Glaciology is included in the ISI Science Citation Index from volume 50, number 50 onwards.

    Themes can be on any aspect of the study of snow and ice. Individual members can make a suggestion for a theme for an Annals issue to the Secretary General, who will forward it to the IGS Publications Committee. The IGS Publication Committee will make a recommendation for an individual themed Annals issue, together with a potential Annals Chief Editor for that issue, to IGS Council. The IGS Council will make the decision whether to proceed, taking into account the spread of topics and the overall capacity for publication of pages in Annals.

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