Considering the Ice Excavation Required to Establish and Maintain an Open Ice Pit
Abstract: Several factors are increasing the likelihood of open ice pit mining adjacent to the Greenland ice sheet. This study employs a fully transient onedimensional (1D) (depth-averaged) ice flow model, which includes a first-order longitudinal stress gradient approximation, to estimate the ice e...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1089.2122 2023-05-15T16:29:23+02:00 Considering the Ice Excavation Required to Establish and Maintain an Open Ice Pit William Colgan The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1089.2122 http://williamcolgan.net/pubs/asce.cr.1943-5495.0000067.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1089.2122 http://williamcolgan.net/pubs/asce.cr.1943-5495.0000067.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://williamcolgan.net/pubs/asce.cr.1943-5495.0000067.pdf text ftciteseerx 2020-05-24T00:19:39Z Abstract: Several factors are increasing the likelihood of open ice pit mining adjacent to the Greenland ice sheet. This study employs a fully transient onedimensional (1D) (depth-averaged) ice flow model, which includes a first-order longitudinal stress gradient approximation, to estimate the ice excavation required to establish and maintain an open ice pit. An idealized open ice pit geometry and purely deformational flow are assumed. A Monte Carlo approach is used to quantify the cumulative uncertainty in total ice excavation resulting from four key parameters: (1) ice temperature, (2) ice thickness, (3) equilibrium line altitude, and (4) surface mass balance gradient. Two scenarios of ice pit slope (2H:1V and 3H:1V), excavation method (constant and progressively steepening slope), and surface ablation enhancement (þ25 and þ50%), are considered. Total ice excavation is more sensitive to parameters controlling deformational velocity (1 and 2) than parameters controlling surface mass balance (3 and 4). Enhancing surface ablation by a feasible amount offers the potential to decrease total ice excavation by ∼10% over mine life. Progressively steepening the ice pit slope offers the potential to limit variability in ice excavation rate, and reduce velocity and ice thickness gradients conducive to crevasse formation. Text Greenland Ice Sheet Unknown Greenland |
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Open Polar |
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ftciteseerx |
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description |
Abstract: Several factors are increasing the likelihood of open ice pit mining adjacent to the Greenland ice sheet. This study employs a fully transient onedimensional (1D) (depth-averaged) ice flow model, which includes a first-order longitudinal stress gradient approximation, to estimate the ice excavation required to establish and maintain an open ice pit. An idealized open ice pit geometry and purely deformational flow are assumed. A Monte Carlo approach is used to quantify the cumulative uncertainty in total ice excavation resulting from four key parameters: (1) ice temperature, (2) ice thickness, (3) equilibrium line altitude, and (4) surface mass balance gradient. Two scenarios of ice pit slope (2H:1V and 3H:1V), excavation method (constant and progressively steepening slope), and surface ablation enhancement (þ25 and þ50%), are considered. Total ice excavation is more sensitive to parameters controlling deformational velocity (1 and 2) than parameters controlling surface mass balance (3 and 4). Enhancing surface ablation by a feasible amount offers the potential to decrease total ice excavation by ∼10% over mine life. Progressively steepening the ice pit slope offers the potential to limit variability in ice excavation rate, and reduce velocity and ice thickness gradients conducive to crevasse formation. |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
William Colgan |
spellingShingle |
William Colgan Considering the Ice Excavation Required to Establish and Maintain an Open Ice Pit |
author_facet |
William Colgan |
author_sort |
William Colgan |
title |
Considering the Ice Excavation Required to Establish and Maintain an Open Ice Pit |
title_short |
Considering the Ice Excavation Required to Establish and Maintain an Open Ice Pit |
title_full |
Considering the Ice Excavation Required to Establish and Maintain an Open Ice Pit |
title_fullStr |
Considering the Ice Excavation Required to Establish and Maintain an Open Ice Pit |
title_full_unstemmed |
Considering the Ice Excavation Required to Establish and Maintain an Open Ice Pit |
title_sort |
considering the ice excavation required to establish and maintain an open ice pit |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1089.2122 http://williamcolgan.net/pubs/asce.cr.1943-5495.0000067.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
http://williamcolgan.net/pubs/asce.cr.1943-5495.0000067.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1089.2122 http://williamcolgan.net/pubs/asce.cr.1943-5495.0000067.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766019073966080000 |