Reconstructing ice‐flow fields from streamlined subglacial bedforms: A kriging approach
Abstract The orientation of several landforms, e.g. drumlins, flutes, crag‐and‐tails, and mega‐scale glacial lineations, records the direction of the overlying ice flow that created them. Populations of such features are used routinely to infer former ice‐flow patterns, which serve as the building b...
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crwiley:10.1002/esp.4538 2024-06-02T08:08:14+00:00 Reconstructing ice‐flow fields from streamlined subglacial bedforms: A kriging approach Ng, Felix S. L. Hughes, Anna L. C. Leverhulme Trust 2018 http://dx.doi.org/10.1002/esp.4538 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.4538 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.4538 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Earth Surface Processes and Landforms volume 44, issue 4, page 861-876 ISSN 0197-9337 1096-9837 journal-article 2018 crwiley https://doi.org/10.1002/esp.4538 2024-05-03T10:44:23Z Abstract The orientation of several landforms, e.g. drumlins, flutes, crag‐and‐tails, and mega‐scale glacial lineations, records the direction of the overlying ice flow that created them. Populations of such features are used routinely to infer former ice‐flow patterns, which serve as the building blocks of reconstructions of palaeo ice‐sheet evolution. Currently, the conceptualisation of flow patterns from these flow‐direction records is done manually and qualitatively, so the extractable glaciological information is limited. We describe a kriging method (with Matlab code implementation) that calculates continuous fields of ice‐flow direction, convergence, and curvature from the flow‐direction records, and which yields quantitative results with uncertainty estimates. We test the method by application to the subglacial bedforms of the Tweed Valley Basin, UK. The results quantify the convergent flow pattern of the Tweed Palaeo‐Ice Stream in detail and pinpoint its former lateral shear margins and where ice flowed around basal bumps. Ice‐flow parameters retrieved by this method can enrich ice‐sheet reconstructions and investigations of subglacial till processes and bedform genesis. © 2018 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd. Article in Journal/Newspaper Ice Sheet Wiley Online Library Earth Surface Processes and Landforms 44 4 861 876 |
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English |
description |
Abstract The orientation of several landforms, e.g. drumlins, flutes, crag‐and‐tails, and mega‐scale glacial lineations, records the direction of the overlying ice flow that created them. Populations of such features are used routinely to infer former ice‐flow patterns, which serve as the building blocks of reconstructions of palaeo ice‐sheet evolution. Currently, the conceptualisation of flow patterns from these flow‐direction records is done manually and qualitatively, so the extractable glaciological information is limited. We describe a kriging method (with Matlab code implementation) that calculates continuous fields of ice‐flow direction, convergence, and curvature from the flow‐direction records, and which yields quantitative results with uncertainty estimates. We test the method by application to the subglacial bedforms of the Tweed Valley Basin, UK. The results quantify the convergent flow pattern of the Tweed Palaeo‐Ice Stream in detail and pinpoint its former lateral shear margins and where ice flowed around basal bumps. Ice‐flow parameters retrieved by this method can enrich ice‐sheet reconstructions and investigations of subglacial till processes and bedform genesis. © 2018 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd. |
author2 |
Leverhulme Trust |
format |
Article in Journal/Newspaper |
author |
Ng, Felix S. L. Hughes, Anna L. C. |
spellingShingle |
Ng, Felix S. L. Hughes, Anna L. C. Reconstructing ice‐flow fields from streamlined subglacial bedforms: A kriging approach |
author_facet |
Ng, Felix S. L. Hughes, Anna L. C. |
author_sort |
Ng, Felix S. L. |
title |
Reconstructing ice‐flow fields from streamlined subglacial bedforms: A kriging approach |
title_short |
Reconstructing ice‐flow fields from streamlined subglacial bedforms: A kriging approach |
title_full |
Reconstructing ice‐flow fields from streamlined subglacial bedforms: A kriging approach |
title_fullStr |
Reconstructing ice‐flow fields from streamlined subglacial bedforms: A kriging approach |
title_full_unstemmed |
Reconstructing ice‐flow fields from streamlined subglacial bedforms: A kriging approach |
title_sort |
reconstructing ice‐flow fields from streamlined subglacial bedforms: a kriging approach |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1002/esp.4538 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.4538 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.4538 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Earth Surface Processes and Landforms volume 44, issue 4, page 861-876 ISSN 0197-9337 1096-9837 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/esp.4538 |
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Earth Surface Processes and Landforms |
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44 |
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4 |
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876 |
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1800753437836574720 |