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dc.contributor.authorPorter, P.R.
dc.contributor.authorMurray, T.
dc.identifier.citationPorter , P R & Murray , T 2001 , ' Mechanical and hydraulic properties of till beneath Bakaninbreen, Svalbard ' , Journal of Glaciology , vol. 47 , no. 157 , pp. 167-175 .
dc.identifier.otherPURE: 124344
dc.identifier.otherPURE UUID: f7c0fffd-2b40-4f06-983b-48612261fca1
dc.identifier.otherdspace: 2299/3381
dc.identifier.otherScopus: 0035205979
dc.descriptionOriginal article can be found at: Copyright IGS. DOI: 10.3189/172756501781832304 [Full text of this article is not available in the UHRA]
dc.description.abstractBakaninbreen, Svalbard, was in the late phase of a prolonged surge during 1995-96. In order to investigate the nature of the basal mechanical and hydraulic regime, sets of tilt sensors equipped with pore-pressure sensors were installed into the basal till layer. Water-pressure transducers were also installed in the boreholes above the ice-till interface. During 1995, the measured mean strain rate in the till was 0.44 a-1 up-glacier of the surge front, while down-glacier the rate was 0.04 a-1. Our interpretation indicates that deformation was the dominant component of basal motion. Strain rates fluctuated strongly, and periods of both positive (down-glacier) and negative (up-glacier) strain occurred. No consistent relationship was apparent between effective pressure and strain rate within the basal till layer. The viscosity of the basal sediments ranged from 1.3 × 1012 to 3.4 × 1012 Pa s. Such high values suggest that the till layer beneath Bakaninbreen may be partially frozen. Analysis of simultaneous measurements of pore-water and borehole water pressure suggests the hydraulic diffusivity of the till layer ranges from 1.2 to 5.0 × 10-6 m2 s-1, and the hydraulic conductivity from 3.2 × 10-7 to 7.7 × 10-8 m s-1.en
dc.relation.ispartofJournal of Glaciology
dc.titleMechanical and hydraulic properties of till beneath Bakaninbreen, Svalbarden
dc.contributor.institutionDepartment of Human and Environmental Sciences
dc.description.statusPeer reviewed
rioxxterms.typeJournal Article/Review

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