UID:
kobvindex_GFZBV026646590
Format:
VI, 76 Seiten
,
Illustrationen
Series Statement:
Research report / Cold Regions Research and Engineering Laboratory 96
Content:
Techniques were established by which quantitative data can be obtained from patterned ground features. The field work was carried out during the summers of 1954 and 1955 near Camp Tuto, Greenland. The investigation site is described, and extensive data are presented. The soil materials composing the patterned ground features were found to be of common mineralogy, grain size distribution, and plasticity. The chemical nature of the soils does not contribute to feature formation; it is the mechanical processes acting on these materials that are important. A sharp rise in the soil water content in the form of ice was consistently noted when passing through the base of the active layer into the present permafrost. A net heave occurred at both feature center and border locations, The magnitude of the heave is about 0.05 ft for the centers and 0.03 ft for the borders. Feature age was estimated to be about 150 yr. Vertical sorting occurs over the entire depth of the active layer but radial sorting is confined to the upper 2 ft. Groundwater flow occurs mostly through the feature borders, and incoming radiation has an important effect on the progression of the frost line. The progression of thaw is very rapid and, by the end of summer, the thaw penetration is greatest under the feature centers.
Note:
CONTENTS
Preface
Summary
Introduction
Site of investigation
Selection of study area
General information about site and vicinity
Accumulation and initial evaluation of data
Feature 1 - preliminary study (raised center feature)
Feature 2 - bench mark excavation - preliminary soils study (depressed center feature)
Feature 3 - cobble orientation study
Feature 4 - precise movement survey
Feature 5 - radial comparison studies
Feature 6 - moisture content survey
Feature 7 - temperature and heat flow study (depressed center feature)
Feature 8 - temperature and heat flow study (raised center feature)
Feature 9 - ground water table studies
Features 10 and 11 - permafrost table survey (depressed and raised center features)
Combined analysis of data
Sharp rise in water content at frost table
Estimate of heave since deposition
Study of heave measurements
Consideration of feature formation time
Soil grain size distribution within features
Conclusions
Recommendations for future work in this or similar patterned ground study areas
Heave and ground-ice accumulation
Solifluction ground flow
Incoming radiation and soil albedo
References
Appendix A: General. study of heat budget of the active layer
In:
Research report / Cold Regions Research and Engineering Laboratory, 96
Language:
English
Keywords:
Forschungsbericht
URL:
https://hdl.handle.net/11681/22899
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