Production and preservation of the smallest drumlins
Few very small drumlins are typically mapped in previously glaciated landscapes, which might be an important signature of subglacial processes or an observational artefact. 143 newly emergent drumlins, recently sculpted by the Mulajokull glacier, have been mapped using high resolution LiDAR and aeri...
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ftloughboroughun:oai:figshare.com:article/9482231 2023-05-15T16:21:48+02:00 Production and preservation of the smallest drumlins John Hillier Ivar Benediktsson Tom Dowling Anders Schomacker 2018-06-06T00:00:00Z https://figshare.com/articles/journal_contribution/Production_and_preservation_of_the_smallest_drumlins/9482231 unknown 2134/32360 https://figshare.com/articles/journal_contribution/Production_and_preservation_of_the_smallest_drumlins/9482231 CC BY-NC-ND 4.0 CC-BY-NC-ND Geology Earth Sciences not elsewhere classified Drumlin Iceland Mulajokull Size-frequency distribution Landform mapping Subglacial bedform Morphometry Text Journal contribution 2018 ftloughboroughun 2022-01-01T19:48:00Z Few very small drumlins are typically mapped in previously glaciated landscapes, which might be an important signature of subglacial processes or an observational artefact. 143 newly emergent drumlins, recently sculpted by the Mulajokull glacier, have been mapped using high resolution LiDAR and aerial photographs in addition to field surveying. In this paper, these are used as evidence that few small drumlins (e.g. height H ≲ 4 m, width W ≲ 40 m, length L ≲ 100 m) are produced; at least, few survive to pass outside the ice margin in this actively forming drumlin field. Specifically, the lack of a multitude of small features seen in other landforms (e.g. volcanoes) is argued not to be due to i) Digital Elevation Model (DEM) resolution or quality, ii) mapper ability in complex (i.e. anthropogenically cluttered or vegetated) landscapes, or iii) post-glacial degradation at this site. So, whilst detection ability must still be at least acknowledged in drumlin mapping, and ideally corrected for in quantitative analyses, this observation can now be firmly taken as a constraint upon drumlin formation models (i.e. statistical, conceptual, or numerical ice flow). Our preferred explanation for the scarcity of small drumlins, at least at sites similar to Mulajokull (i.e. ice lobes with near-margin drumlin genesis), is that they form stochastically during multiple surge cycles, evolving from wide and gentle pre-existing undulations by increasing rapidly in amplitude before significant streamlining occurs. Other Non-Article Part of Journal/Newspaper glacier Iceland Loughborough University: Figshare |
institution |
Open Polar |
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Loughborough University: Figshare |
op_collection_id |
ftloughboroughun |
language |
unknown |
topic |
Geology Earth Sciences not elsewhere classified Drumlin Iceland Mulajokull Size-frequency distribution Landform mapping Subglacial bedform Morphometry |
spellingShingle |
Geology Earth Sciences not elsewhere classified Drumlin Iceland Mulajokull Size-frequency distribution Landform mapping Subglacial bedform Morphometry John Hillier Ivar Benediktsson Tom Dowling Anders Schomacker Production and preservation of the smallest drumlins |
topic_facet |
Geology Earth Sciences not elsewhere classified Drumlin Iceland Mulajokull Size-frequency distribution Landform mapping Subglacial bedform Morphometry |
description |
Few very small drumlins are typically mapped in previously glaciated landscapes, which might be an important signature of subglacial processes or an observational artefact. 143 newly emergent drumlins, recently sculpted by the Mulajokull glacier, have been mapped using high resolution LiDAR and aerial photographs in addition to field surveying. In this paper, these are used as evidence that few small drumlins (e.g. height H ≲ 4 m, width W ≲ 40 m, length L ≲ 100 m) are produced; at least, few survive to pass outside the ice margin in this actively forming drumlin field. Specifically, the lack of a multitude of small features seen in other landforms (e.g. volcanoes) is argued not to be due to i) Digital Elevation Model (DEM) resolution or quality, ii) mapper ability in complex (i.e. anthropogenically cluttered or vegetated) landscapes, or iii) post-glacial degradation at this site. So, whilst detection ability must still be at least acknowledged in drumlin mapping, and ideally corrected for in quantitative analyses, this observation can now be firmly taken as a constraint upon drumlin formation models (i.e. statistical, conceptual, or numerical ice flow). Our preferred explanation for the scarcity of small drumlins, at least at sites similar to Mulajokull (i.e. ice lobes with near-margin drumlin genesis), is that they form stochastically during multiple surge cycles, evolving from wide and gentle pre-existing undulations by increasing rapidly in amplitude before significant streamlining occurs. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
John Hillier Ivar Benediktsson Tom Dowling Anders Schomacker |
author_facet |
John Hillier Ivar Benediktsson Tom Dowling Anders Schomacker |
author_sort |
John Hillier |
title |
Production and preservation of the smallest drumlins |
title_short |
Production and preservation of the smallest drumlins |
title_full |
Production and preservation of the smallest drumlins |
title_fullStr |
Production and preservation of the smallest drumlins |
title_full_unstemmed |
Production and preservation of the smallest drumlins |
title_sort |
production and preservation of the smallest drumlins |
publishDate |
2018 |
url |
https://figshare.com/articles/journal_contribution/Production_and_preservation_of_the_smallest_drumlins/9482231 |
genre |
glacier Iceland |
genre_facet |
glacier Iceland |
op_relation |
2134/32360 https://figshare.com/articles/journal_contribution/Production_and_preservation_of_the_smallest_drumlins/9482231 |
op_rights |
CC BY-NC-ND 4.0 |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766009782159802368 |