Insights into drumlin development from ground-penetrating radar at Múlajökull, Iceland, a surge-type glacier
Drumlins form at the ice/bed interface through subglacial processes that are not directly observable. The internal stratigraphy of drumlins provides insight into how they developed and associated subglacial processes, but traditional stratigraphic logging techniques are limited to natural exposures...
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Cambridge University Press
2020
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ftdoajarticles:oai:doaj.org/article:cf3a80013b604c5ca9fd025f2d09a761 2023-05-15T16:21:40+02:00 Insights into drumlin development from ground-penetrating radar at Múlajökull, Iceland, a surge-type glacier Jacob B. Woodard Lucas K. Zoet Ívar Ö. Benediktsson Neal R. Iverson Andrew Finlayson 2020-10-01T00:00:00Z https://doi.org/10.1017/jog.2020.50 https://doaj.org/article/cf3a80013b604c5ca9fd025f2d09a761 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143020000507/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2020.50 0022-1430 1727-5652 https://doaj.org/article/cf3a80013b604c5ca9fd025f2d09a761 Journal of Glaciology, Vol 66, Pp 822-830 (2020) Drumlins Ground-penetrating radar Subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2020 ftdoajarticles https://doi.org/10.1017/jog.2020.50 2023-03-12T01:30:57Z Drumlins form at the ice/bed interface through subglacial processes that are not directly observable. The internal stratigraphy of drumlins provides insight into how they developed and associated subglacial processes, but traditional stratigraphic logging techniques are limited to natural exposures and excavations. Using ground-penetrating radar, we imaged the internal stratigraphy of seven drumlins from a recently exposed drumlin field in the forefield of Múlajökull, Iceland. Data were collected with 100 and 200 MHz antennas with maximum resolvable depths of 8 and 4 m, respectively. Longitudinal echograms contained coherent down-ice dipping reflectors over the lengths of the drumlins. Near the drumlin heads (i.e., stoss sides), down-glacier dipping beds lie at high angles to the surface, whereas on the lee sides, the down-glacier dipping beds lie at low angles, or conform, to drumlin surfaces. Transverse echograms exhibited unconformities along the flanks of drumlin heads and conformable bedding across the lee side widths of the drumlins. These observations were ground-truthed with stratigraphic logs from a subset of drumlins and good agreement was found. The stratigraphic patterns support previous conclusions that drumlins at Múlajökull formed on a deformable bed through both depositional and erosional processes which may alternate between its surge and quiescent phases. Article in Journal/Newspaper glacier Iceland Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 66 259 822 830 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Drumlins Ground-penetrating radar Subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Drumlins Ground-penetrating radar Subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Jacob B. Woodard Lucas K. Zoet Ívar Ö. Benediktsson Neal R. Iverson Andrew Finlayson Insights into drumlin development from ground-penetrating radar at Múlajökull, Iceland, a surge-type glacier |
topic_facet |
Drumlins Ground-penetrating radar Subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Drumlins form at the ice/bed interface through subglacial processes that are not directly observable. The internal stratigraphy of drumlins provides insight into how they developed and associated subglacial processes, but traditional stratigraphic logging techniques are limited to natural exposures and excavations. Using ground-penetrating radar, we imaged the internal stratigraphy of seven drumlins from a recently exposed drumlin field in the forefield of Múlajökull, Iceland. Data were collected with 100 and 200 MHz antennas with maximum resolvable depths of 8 and 4 m, respectively. Longitudinal echograms contained coherent down-ice dipping reflectors over the lengths of the drumlins. Near the drumlin heads (i.e., stoss sides), down-glacier dipping beds lie at high angles to the surface, whereas on the lee sides, the down-glacier dipping beds lie at low angles, or conform, to drumlin surfaces. Transverse echograms exhibited unconformities along the flanks of drumlin heads and conformable bedding across the lee side widths of the drumlins. These observations were ground-truthed with stratigraphic logs from a subset of drumlins and good agreement was found. The stratigraphic patterns support previous conclusions that drumlins at Múlajökull formed on a deformable bed through both depositional and erosional processes which may alternate between its surge and quiescent phases. |
format |
Article in Journal/Newspaper |
author |
Jacob B. Woodard Lucas K. Zoet Ívar Ö. Benediktsson Neal R. Iverson Andrew Finlayson |
author_facet |
Jacob B. Woodard Lucas K. Zoet Ívar Ö. Benediktsson Neal R. Iverson Andrew Finlayson |
author_sort |
Jacob B. Woodard |
title |
Insights into drumlin development from ground-penetrating radar at Múlajökull, Iceland, a surge-type glacier |
title_short |
Insights into drumlin development from ground-penetrating radar at Múlajökull, Iceland, a surge-type glacier |
title_full |
Insights into drumlin development from ground-penetrating radar at Múlajökull, Iceland, a surge-type glacier |
title_fullStr |
Insights into drumlin development from ground-penetrating radar at Múlajökull, Iceland, a surge-type glacier |
title_full_unstemmed |
Insights into drumlin development from ground-penetrating radar at Múlajökull, Iceland, a surge-type glacier |
title_sort |
insights into drumlin development from ground-penetrating radar at múlajökull, iceland, a surge-type glacier |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
https://doi.org/10.1017/jog.2020.50 https://doaj.org/article/cf3a80013b604c5ca9fd025f2d09a761 |
genre |
glacier Iceland Journal of Glaciology |
genre_facet |
glacier Iceland Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 66, Pp 822-830 (2020) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143020000507/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2020.50 0022-1430 1727-5652 https://doaj.org/article/cf3a80013b604c5ca9fd025f2d09a761 |
op_doi |
https://doi.org/10.1017/jog.2020.50 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
259 |
container_start_page |
822 |
op_container_end_page |
830 |
_version_ |
1766009661875552256 |