Call number:
ZSP-202-107
In:
Research report / Cold Regions Research and Engineering Laboratory, 107
Description / Table of Contents:
Summary: The formation of lake ice was studied during the winter of 1956-57 at Post Pond, Lyme, N. H. Tabular, columnar, granular, and crenulate textures of 36 blocks of ice observed are discussed in terms of relative growth velocity and shown in a classification chart. Ice structures are characterized by Forel striations, Tyndall figures, bubbles and strain shadows. Average crystal areas increased with ice thickness, the rate of increase being greater toward lake center, and ceased to enlarge when in a continuous bubble layer. The lake-ice sheet grew both from top and bottom, .downward growth resulting from crystals in a favorable vertical orientation of a-axes and upward growth coming about by water flowing on the original upper ice surface and freezing. Exception to this type of growth was found in the lake area which froze first, where individual crystal areas were larger at the surface and there was no upper surface ice accretion. Fabric diagrams of ice outside the anomolous area show a change of optic axis orientation from a high percentage of c-axes vertical near the surface to a high percentage horizontal at the bottom.
Type of Medium:
Series available for loan
Pages:
iv, 22, A2, B1 Seiten
,
Illustrationen
Series Statement:
Research report / Cold Regions Research and Engineering Laboratory 107
URL:
https://hdl.handle.net/11681/5847
Language:
English
Note:
CONTENTS
Preface
Summary
Description of the lake
Cli rna te of the lake
Methods of study
Ice textures
Crystal size
Ice structures
Crystal fabric studies
Growth of an ice sheet
References
Appendix A: Weather data
Appendix B: Sample data
Location:
AWI Archive
Branch Library:
AWI Library
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