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- W1620662298 abstract "Abstract Force variations on a ploughmeter and fluctuations in subglacial water pressure have been measured in the same borehole at Storglaciaren, Sweden, to investigate hydraulic properties of the basal till layer. A strong inverse correlation of the pressure and force records, in conjunction with a significant lime lag between the two signals, suggests that pore-water pressures directly affect the strength of the till. Variations in sub-glacial water pressure result in potential gradients across the water till interlace at the bottom of the borehole that drive pressure waves downwards through the till layer when the borehole water level is high and back upwards when the water level is low. Analysis of the propagation velocity of this pressure wave indicates that the hydraulic diffusivity of Storglaciaren till is in the range 1.9−3.6 x 10 −6 m 2 s −1 ,in good agreement with estimates obtained in the laboratory. Hydraulic conductivity values associated with these difrusivities are between 10 −9 and 10 −8 ms −1 and thus are well within the range of values for other glacial tills." @default.
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- W1620662298 date "1998-01-01" @default.
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- W1620662298 title "Estimation of hydraulic properties of subglacial till from ploughmeter measurements" @default.
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- W1620662298 doi "https://doi.org/10.3189/s0022143000002033" @default.
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