Download or read book Physical Properties and Internal Structure of Greenland Snow written by Ukichirō Nakaya and published by . This book was released on 1970 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments were carried out near Thule, Greenland, on the correlation between the physical properties and internal structure of snow. About 150 snow samples obtained to 26 m depth were measured for elastic modulus, air permeability, unconfined compressive strength, static compression and creep. The observed density profile curve deviated from the theoretical curve at a depth of 10 m. and density of 0.52 g/cu cm, a value almost equivalent to the limiting density obtainable by simple mechanical packing. Therefore, further densification must proceed through plastic flow in grains. A similar critical depth was observed in the vertical distribution of Young's modulus. A positive correlation was found between Young's modulus and an adverse correlation between average grain diameter and Young's modulus or density. There were reciprocal correlations between air permeability and density or unconfined compressive strength, and between the number of grains and their average diameters. Kozeny's constant of Greenland snow was obtained from air permeability values and the length of peripheries of cross sections of grains. To demonstrate the change of internal structure of snow due to densification, static compression tests of snow cylinders were conducted, and thin sections of snow texture were compared before and after compression. (Author).
Download or read book Physical Properties and Internal Structure of Greenland Snow written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1962 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physical properties and internal structure of Greenland snow written by Ukichiro Nakaya and published by . This book was released on 1970 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments were carried out near Thule, Greenland, on the correlation between the physical properties and internal structure of snow. About 150 snow samples obtained to 26 m depth were measured for elastic modulus, air permeability, unconfined compressive strength, static compression and creep. The observed density profile curve deviated from the theoretical curve at a depth of 10 m. and density of 0.52 g/cu cm, a value almost equivalent to the limiting density obtainable by simple mechanical packing. Therefore, further densification must proceed through plastic flow in grains. A similar critical depth was observed in the vertical distribution of Young's modulus. A positive correlation was found between Young's modulus and an adverse correlation between average grain diameter and Young's modulus or density. There were reciprocal correlations between air permeability and density or unconfined compressive strength, and between the number of grains and their average diameters. Kozeny's constant of Greenland snow was obtained from air permeability values and the length of peripheries of cross sections of grains. To demonstrate the change of internal structure of snow due to densification, static compression tests of snow cylinders were conducted, and thin sections of snow texture were compared before and after compression. (Author).
Download or read book Research Report Corps of Engineers U S Army Cold Regions Research and Engineering Laboratory written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1970 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book SIPRE Report written by and published by . This book was released on with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book USA CRREL Technical Publications written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1972 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Depth time temperature Relationships of Ice Crystal Growth in Polar Glaciers written by Anthony Jack Gow and published by . This book was released on 1971 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The growth of ice crystals as a function of depth and time in polar firn and glacier ice has been investigated at a number of locations in Antarctica and Greenland. Thin sections of snow and ice were used to measure crystal size variations. Crystal growth rates are strongly temperature dependent with growth being very much retarded at the lower englacial temperatures. At Camp Century, Greenland, where the firn temperature is -24C (constant below 10 m depth) crystals grow approximately 23 times faster than at Plateau Station, Antarctica, where the in situ temperature is -57C. (Author).
Download or read book Special Report Corps of Engineers U S Army Cold Regions Research and Engineering Laboratory written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1972 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CRREL Technical Publications 1950 1975 written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1992 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physical Properties of the Ice Cover of the Greenland Sea written by United States. Department of the Army. Cold Regions Research and Engineering Laboratory and published by . This book was released on 1982 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a very little information available on the physical properties of the ice cover of the Greenland Sea. This paper reviews what is known about the different types of ice that are believed to occur in this area. It also discusses how the internal structure and composition of these ice masses may differ from those of the more extensively studied ice of the Beaufort Sea and identifies gaps in the present knowledge of the properties of such ice masses (regardless of place of origin). Finally a strategy is outlined for efficiently studying the properties of the ice in the Greenland Sea by combining structural and compositional characterization with limited property determinations. (Author).
Download or read book Physics of Snow and Ice written by Hirobumi Ōura and published by . This book was released on 1967 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physical Properties of the Ice Cover of the Greenland Sea written by W. F. Weeks and published by . This book was released on 1982 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1970 with total page 1250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abstracts of North American Geology written by Geological Survey (U.S.) and published by . This book was released on 1968-07 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics of snow and ice 2 pts written by Hirobumi Ôura and published by . This book was released on 1967 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings pt 1 2 Conference on Physics of Snow and Ice Sapporo Japan 1966 Physics of snow and ice written by and published by . This book was released on 1967 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications Cumulative Index written by United States. Superintendent of Documents and published by . This book was released on 1979 with total page 1504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
