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Record #97316:

Force budget: 2. Application to two-dimensional flow along Byrd station strain network, Antarctica / C.J. Van der Veen, Ian M. Whillans.

Title: Force budget: 2. Application to two-dimensional flow along Byrd station strain network, Antarctica / C.J. Van der Veen, Ian M. Whillans.
Author(s): Van der Veen, C. J.
Whillans, Ian M.
Date: 1989.
In: Journal of Glaciology. (1989.), Vol. 35(119) (1989)
Abstract: Resistive stresses and velocities at depth are calculated along network, using field data. Large longitudinal variations in basal drag are found, and this result is little affected by errors in input data or by uncertainties in constitutive relation for ice. Basal drag varies by factor of 2 along strain network, and is usually equal to driving stress to within 10 to 20%. Sites of high drag are not always correlated with basal topographic highs, indicating that some process such as basal water drainage is involved in controlling friction at bed. Basal sliding velocities are sensitive to errors in measured surface velocities and rate factor in Glen's flow law. Result is that calculated sliding velocities are much less reliable than deep stresses, and need to be interpreted with caution.
Notes:

Journal of Glaciology. Vol. 35(119) :61-67 (1989).

Keywords: 551.32 -- Glaciology.
551.324 -- Land ice.
551.324.51 -- Land ice, theory of flow.
E5 -- Glaciology: land ice.
SPRI record no.: 97316

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100 1# ‡aVan der Veen, C. J.
245 10 ‡aForce budget :‡b2. Application to two-dimensional flow along Byrd station strain network, Antarctica /‡cC.J. Van der Veen, Ian M. Whillans.
260 ## ‡a[S.l.] :‡b[s.n.],‡c1989.
300 ## ‡ap. 61-67 :‡bdiags.
500 ## ‡aJournal of Glaciology. Vol. 35(119) :61-67 (1989).
520 3# ‡aResistive stresses and velocities at depth are calculated along network, using field data. Large longitudinal variations in basal drag are found, and this result is little affected by errors in input data or by uncertainties in constitutive relation for ice. Basal drag varies by factor of 2 along strain network, and is usually equal to driving stress to within 10 to 20%. Sites of high drag are not always correlated with basal topographic highs, indicating that some process such as basal water drainage is involved in controlling friction at bed. Basal sliding velocities are sensitive to errors in measured surface velocities and rate factor in Glen's flow law. Result is that calculated sliding velocities are much less reliable than deep stresses, and need to be interpreted with caution.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324 -- Land ice.‡2udc
650 07 ‡a551.324.51 -- Land ice, theory of flow.‡2udc
650 07 ‡aE5 -- Glaciology: land ice.‡2local
700 1# ‡aWhillans, Ian M.
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