Incorporation of rheological properties into ice sheet flow models ...
In most current ice sheet models the rheological properties of ice are usually assumed to be either isotropic or some effects of anisotropy are taken into account by the use of a simple constant enhancement factor. Studies of ice cores have shown that in natural ice sheets approximately isotropic ic...
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| Format: | Thesis |
| Language: | unknown |
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University Of Tasmania
2023
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| Online Access: | https://dx.doi.org/10.25959/23242100 https://figshare.utas.edu.au/articles/thesis/Incorporation_of_rheological_properties_into_ice_sheet_flow_models/23242100 |
| Summary: | In most current ice sheet models the rheological properties of ice are usually assumed to be either isotropic or some effects of anisotropy are taken into account by the use of a simple constant enhancement factor. Studies of ice cores have shown that in natural ice sheets approximately isotropic ice only exists at shallow depths typically less than several hundred metres. The large amounts of deeper ice have developed strong anisotropic crystal orientation fabrics. The results from both field and laboratory studies have indicated that the anisotropy due to flowinduced crystal orientations has a considerable effect on ice flow rate, therefore, the assumption of isotropic ice is no longer appropriate when anisotropy of the ice crystal fabric develops and we need to take account of the interaction between crystal orientation and rates of deformation. This project aims to incorporate into an ice sheet rnpdel the effect of ice fabric anisotropy on the flow of ice. A model for anisotropic ice flow in a polar ice ... |
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