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Title: Some observations on the densification of Alpine snow covers
Authors: Keeler, Charles M. (Charles Martyn)
Keywords: Snow
Snow density
Snow cover
Snow metamorphism
Snow properties
Mountain ranges
Alpine regions
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 197.
Description: Technical Report
Abstract: Through pit measurements on selected deep seasonal snow covers, observations have been made on the densification rates of dry snows. The variation between rates has been compared with such physical characteristics of the snow as temperature, grain size, and loading rate. The rate of densification does not appear to be affected by temperature in the -1 to -10°C range but it is inversely proportional to grain size and sensitive to rates of loading during the formative stage of any particular snow layer. Values of compressive viscosity vary from 10^6 to 10^9 gm/cm^2 per second which is an order of magnitude less than the lowest values for polar snow. Plots of specific volume against overburden reveal a sharp discontinuity at a specific volume of about 3.0 cm^3/gm. The persistence of this discontinuity from location to location indicates that it may reflect a real phenomenon. It is suggested that it may be accounted for by extremely high strain rates at low densities.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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