Distributed shear of subglacial till due to Coulomb slip / Neal R. Iverson, Richard M. Iverson.

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100 1# ‡aIverson, Neal R.
245 10 ‡aDistributed shear of subglacial till due to Coulomb slip /‡cNeal R. Iverson, Richard M. Iverson.
260 ## ‡a[S.l.] :‡b[s.n.],‡c2001.
300 ## ‡ap. 481-488 :‡bdiags., table.
500 ## ‡aJournal of Glaciology. Vol. 47(158) :481-488 (2001).
520 3# ‡aAims to demonstrate that till displacement profiles like those observed beneath Breidamerkurjökull, Iceland may arise from deformation resisted only by Coulomb friction and that a viscoplastic till rheology cannot be inferred confidently from such profiles. Explores hypothesis that local stress fluctuations cause bulk deformation of subglacial till. Presents simple analytical model of till deformation in which motion occurs along a series of bed- parallel slip planes. Assumes simple Coulomb friction, with till deformed sufficiently to be in its critical state and perturbations in effective normal stress occurring with equal magnitude at all depths. Successfully adjusts model parameters to fit observed distribution of motion with depth at Breidamerkurjökull, assuming that limiting equilibrium was reached once each day (consistent with observed roughly diurnal variation in pore water pressure). Notes that neither dilatant hardening nor pore-pressure diffusion is necessary to account for observed distribution of displacement. Concludes fluid-like deformation profiles need not be a consequence of a fluid-like, i.e. viscous, rheology.
650 07 ‡a551.33 -- Glacial geology.‡2udc
650 07 ‡a551.333 -- Glacial deformation and glaciotectonic structures.‡2udc
650 07 ‡a551.324.5 -- Land ice, flow.‡2udc
650 07 ‡a519.673 -- Modelling.‡2udc
650 07 ‡aE7 -- Glaciology: glacial geology and ice ages.‡2local
700 1# ‡aIverson, Richard M.
773 0# ‡7nnas ‡tJournal of Glaciology. ‡gVol. 47(158) (2001) ‡wSPRI-20534
917 ## ‡aUnenhanced record from Muscat, imported 2019
948 3# ‡a20230924