Results 171 to 180 of about 63,457 (214)

Flow Patterns in Glacier Ice

Journal of Applied Physics, 1956
The mass of ice varies along the length of a glacier because of the accumulation of snow in its upper regions and the ablation of ice in the lower regions. This mass change brings about variable speeds of flow and complex streamlines. General equations are derived using a type of plug flow for ice for the following: (1) glaciers of constant arbitrarily
Lawrence E. Nielsen, F. D. Stockton
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Glacier Flow Modeling

1993
As a geophysical fluid dynamics phenomenon, glacier motion has features in common with some of the other terrestrial and planetary flows considered in this book, but it also has a number of special features that give it a character of its own. It can be compared to mantle flow and convection: both involve slow flow of essentially incompressible fluids ...
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Fast glacier flow: Ice streams, surging, and tidewater glaciers

Journal of Geophysical Research: Solid Earth, 1987
Fast flowing glaciers are unusual but important. Jakobshavns Glacier in western Greenland illustrates this point (Figure 1). Considered to be the world's fastest glacier, its maximum observed flow rate (measured in midsummer near the floating terminus) is 8360 m yr−1 [Lingle et al., 1981].
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Flow Mechanism of Glaciers on Soft Beds

Science, 1995
Subhourly measurements of bed deformation, bed shear strength, subglacial water pressure, and surface speed at Storglaciären, a glacier in northern Sweden, showed that the shear-strain rates of the bed decrease during periods of high water pressure and surface speed.
N R, Iverson, B, Hanson, R L, Hooke, P, Jansson   +3 more
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Modelling ice flow in various Glacier zones

Journal of Applied Mathematics and Mechanics, 2001
The authors propose a simplified model of plane isothermal stationary ice flow in the surface part, shelf and transition region of ice and ice-shelf interacting with the sea. The results of dynamics analysis of the ice interface region are presented for axisymmetric ice flow.
Wilchinsky, A. V., Chugunov, V. A.
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Detecting Glacier Surface Motion by Optical Flow

Photogrammetric Engineering & Remote Sensing, 2018
In this study, we assessed the feasibility of using optical flow, in particular, large displacement optical flow (<small>LDOF</small>) method as a possible solution to obtain surface movement data to derive ice flow velocities in a glacier.
Lenzano, María Gabriela, Lannutti, Esteban Damián, Toth, C., Rivera, Andres, Lenzano, Luis Eduardo   +4 more
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Effects of Basal Debris on Glacier Flow

Science, 2003
Glacier movement is resisted partially by debris, either within glaciers or under glaciers in water-saturated layers. In experiments beneath a thick, sliding glacier, ice containing 2 to 11% debris exerted shear traction of 60 to 200 kilopascals on a smooth rock bed, comparable to the total shear traction beneath glaciers and contrary to the usual ...
Neal R, Iverson, Denis, Cohen, Thomas S, Hooyer, Urs H, Fischer, Miriam, Jackson, Peter L, Moore, Gaute, Lappegard, Jack, Kohler   +7 more
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Understanding Glacier Flow in Changing Times

Science, 2008
Subannual lurches of the Greenland and Antarctic ice sheets may reduce uncertainties about climate change effects on sea-level rise.
Richard B. Alley, Mark Fahnestock, Ian Joughin   +2 more
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Flow instabilities of Alaskan glaciers

2014
Over 300 of the largest glaciers in southern Alaska have been identified as either surge-type or pulse-type, making glaciers with flow instabilities the norm among large glaciers in that region. Consequently, the bulk of mass loss due to climate change will come from these unstable glaciers in the future, yet their response to future climate warming is
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Accurate modelling of glacier flow

1981
Recent interest in climatic change and ice .sheet variations points out the need for accurate and numerically stable models of time-dependent ice masses. Little attention has been paid to this topic by the glaciological community, and there is good reason to believe that much of the published literature on numerical modelling of the flow of glaciers ...
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