Call number:
ZSP-202-53
In:
Research report / Cold Regions Research and Engineering Laboratory, 53
Description / Table of Contents:
Summary: The results of investigations on the structural changes of Greenland snow during age-hardening in the first 49 hr after ejection by a Peter snow miller from a trench 4.7 ft deep are reported, and the method of study is described. The samples of snow were taken at various distances from the trench 1, 3, 14, 25, and 49 hr after deposition, and their changes were studied as a function of time and distance from the trench. The porosity remained constant at an average of 50 ± 3%. The number of grains/cm^2 decreased with time and increased with distance from the trench because of the different speeds of sedimentation and wind sifting. The mean grain cross-section showed a similar dependence. The relative length of grain boundaries increased with time and slightly with distance from the trench, while the mean length of new grain-to-grain boundaries increased with age and decreased with distance from the trench. The mean number of adjacent grains per grain vs. relative length of grain boundaries showed a linear relation. A slight increase of new boundaries with increasing number of neighbors was also observed. Suggestions for a precise study of the age-hardening process of snow are made.
Type of Medium:
Series available for loan
Pages:
v, 15, A5 Seiten
,
Illustrationen
Series Statement:
Research report / Cold Regions Research and Engineering Laboratory 53
URL:
https://hdl.handle.net/11681/2697
Language:
English
Note:
CONTENTS
Preface
Summary
Methods of testing
Sampling
Preparation of samples
Preparation of structure pictures
Results
Influence of time and place
Porosity
Number of grains/cm2
Mean grain cross section
Relative length of grain boundaries (KM ratio)
Mean number of adjacent grains per grain
Number of new boundaries/cm 2
Mean length of new grain-to-grain boundaries
Some interrelations of the structure data
Structure of a 1-yr old Peter snow
Suggestions for an exact study of the age-hardening process of snow
References
Appendix: Structure pictures
Location:
AWI Archive
Branch Library:
AWI Library
