Glen-Nye Flow Law: Where can I find a list of constants (k, A) to determine the strain rate of a glacier?

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William W. Locke

Paterson (now Cuffey and Paterson) "The Physics of Glaciers" 4th ed., Elsevier, 2010, includes discussion of the equation and constants as well as experimental data. I note that Amazon has free-trial electronic access.

G. Bothun

this might help

http://www.igsoc.org:8080/journal/5/39/igs_journal_vol05_issue039_pg305-313.pdf

In general this is a hard problem and I would suggest finding studies of body of ice with similar parameters and using that empirical data to estimate what k and A are - ultimately you will end up with a model dependent result.