Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/5916
Title: Criteria for measurement of strain rates in deep bore holes in polar glaciers
Authors: University of Miami.
Bader, Henri, 1907-
Keywords: Glaciers
Drilling
Coring
Bore holes
Polar regions
Flow measurements
Measurements
Strains
Strain rates
Models
Mathematical models
Stresses
Ice
Ice sheets
Ice caps
EPOLAR
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Research report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 127.
Description: Research Report
Summary: The problem of strain rate measurement in bore holes is analyzed and the necessary accuracy is estimated. Based on a simplified model, strain rates are calculated as a function of depth below the surface for Camp Century, Greenland, and Byrd Station, Antarctica. It is assumed that (1) there are no strains normal to the vertical plain containing the flow lines, and (2) the thickness above any fixed point on the bed is constant. The drill hole is in the accumulation area. The components of the vertical strain rate are : (1) layer thinning to compensate for accumulation, (2) layer thinning or thickening when surface and bed slopes are unequal, (3) layer thinning by reduction of enclosed air volume, and (4) layer thinning due to elastic compression of ice. Inclinometer measurements can only be expected to yield the horizontal shear strain rate. An expression is given for correcting the non-verticality of the drill hole. The results indicate that only very high measurement accuracy is likely to yield useful results.
URI: http://hdl.handle.net/11681/5916
Appears in Collections:CRREL Research Report

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