| Reference Type | Journal (article/letter/editorial) |
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| Title | Headwall retreat of ground-ice slumps, Banks Island, Northwest Territories |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Lewkowicz, Antoni G. | Author |
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| Year | 1987 (June 1) | Volume | 24 |
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| Issue | 6 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e87-105Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 479567 | Long-form Identifier | mindat:1:5:479567:8 |
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| GUID | 0 |
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| Full Reference | Lewkowicz, Antoni G. (1987) Headwall retreat of ground-ice slumps, Banks Island, Northwest Territories. Canadian Journal of Earth Sciences, 24 (6) 1077-1085 doi:10.1139/e87-105 |
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| Plain Text | Lewkowicz, Antoni G. (1987) Headwall retreat of ground-ice slumps, Banks Island, Northwest Territories. Canadian Journal of Earth Sciences, 24 (6) 1077-1085 doi:10.1139/e87-105 |
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| In | (1987, June) Canadian Journal of Earth Sciences Vol. 24 (6) Canadian Science Publishing |
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| Abstract/Notes | The relationship between ice-face ablation and headwall retreat is described for three ground-ice slumps in the Sand Hills moraine, southwest Banks Island. Retreat exceeds ablation by a geometric factor that depends on the slope of the ice and the gradient of the surrounding terrain. Amounts of retreat predicted from ice-ablation calculations compare favourably with field measurements, except at the start of thermokarst activity in the spring or when the ground ice remains covered by debris for long periods.Long-term headwall retreat for slumps in southern Banks Island with different orientations and ice contents can be estimated using a model based on meteorological information. The model predicts headwall recession of 11 m/a for a ground-ice slump facing south and 8.8–9.3 m/a for one facing north, with inputs of a 35 °ice face, a ground slope of 5°, and a volumetric latent heat of 270 MJ/m3. These predictions are close to the maximum rates of retreat over a 10 year period as measured from air photographs. |
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