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• W930231572 abstract "In most current ice sheet models the rheological properties of ice are usuallyassumed to be either isotropic or some effects of anisotropy are taken into accountby the use of a simple constant enhancement factor. Studies of ice cores haveshown that in natural ice sheets approximately isotropic ice only exists at shallowdepths typically less than several hundred metres. The large amounts of deeperice have developed strong anisotropic crystal orientation fabrics. The results fromboth field and laboratory studies have indicated that the anisotropy due to flowinducedcrystal orientations has a considerable effect on ice flow rate, therefore,the assumption of isotropic ice is no longer appropriate when anisotropy of the icecrystal fabric develops and we need to take account of the interaction betweencrystal orientation and rates of deformation. This project aims to incorporate intoan ice sheet rnpdel the effect of ice fabric anisotropy on the flow of ice.A model for anisotropic ice flow in a polar ice sheet is developed. It is based onlaboratory measurements of ice rheology including ice cores and combined withborehole measurements in the ice sheet. In the model the shear flow of ice isenhanced as the ice passes through a range of stress regimes from predominantlyvertical compression to predominantly vertical shear stress, as it flows downthrough the ice sheet. The enhanced flow, characterised by an increase in strainratescompared to the secondary creep rate for isotropic ice, is primarily based onlaboratory measurements of tertiary creep under combined compression and shearstresses.To test this model two different flow lines in the Antarctic ice sheet have beenstudied. One flow line is from Law Dome which is an isolated ice cap withshallower and warmer ice. For comparison, the second, longer flow line, theI.A.G.P traverse line inland of Casey in the interior of East Antarctica, wasstudied to explore different conditions for deeper, colder ice and larger scalebedrock features. A simple application of the model to a number of boreholeswith ice cores in Law Dome has been made, including a new borehole drilled in Law Dome Summit South where shear strain rates were measured as well as icecore fabrics through the 1200 m depth to the bed. In the study areas a largeamount of glaciological work involving field surveys and ice core drillingprovides sufficient data for model inputs and for model verification. The resultsfrom the model were compared with observations.The implications of this work for other regions, including the whole Antarctic icesheet, were also investigated.It is concluded that in regions of high bedrock roughness the occurrence of a highshear layer of strongly anisotropic ice above the predominant bedrockperturbations needs to be taken into account." @default.
• W930231572 created "2016-06-24" @default.
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• W930231572 date "2000-01-01" @default.
• W930231572 modified "2023-09-26" @default.
• W930231572 title "Incorporation of rheological properties into ice sheet flow models" @default.
• W930231572 hasPublicationYear "2000" @default.
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