A model for interaction between conduits and surrounding hydraulically connected distributed drainage based on geomorphological evidence from Keewatin, Canada
<p>We identify and map visible traces of subglacial meltwater drainage around the former Keewatin Ice Divide, Canada, from high-resolution Arctic Digital Elevation Model (ArcticDEM) data. We find similarities in the characteristics and spatial locations of landforms traditionally treated separ...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2020-09-01
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| Series: | The Cryosphere |
| Online Access: | https://tc.copernicus.org/articles/14/2949/2020/tc-14-2949-2020.pdf |
| _version_ | 1818475882635853824 |
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| author | E. L. M. Lewington S. J. Livingstone C. D. Clark A. J. Sole R. D. Storrar |
| author_facet | E. L. M. Lewington S. J. Livingstone C. D. Clark A. J. Sole R. D. Storrar |
| author_sort | E. L. M. Lewington |
| collection | DOAJ |
| description | <p>We identify and map visible traces of subglacial meltwater drainage around
the former Keewatin Ice Divide, Canada, from high-resolution Arctic Digital
Elevation Model (ArcticDEM) data. We find similarities in the
characteristics and spatial locations of landforms traditionally treated
separately (i.e. meltwater channels, meltwater tracks and eskers) and
propose that creating an integrated map of meltwater routes captures a
more holistic picture of the large-scale drainage in this area. We propose
the grouping of meltwater channels and meltwater tracks under the term
meltwater corridor and suggest that these features in the order of 10s–100s m wide, commonly surrounding eskers and transitioning along flow
between different types, represent the interaction between a central conduit
(the esker) and surrounding hydraulically connected distributed drainage
system (the meltwater corridor). Our proposed model is based on contemporary
observations and modelling which suggest that connections between conduits
and the surrounding distributed drainage system within the ablation zone
occur as a result of overpressurisation of the conduit. The widespread
aerial coverage of meltwater corridors (5 %–36 % of the bed) provides
constraints on the extent of basal uncoupling induced by basal water
pressure fluctuations. Geomorphic work resulting from repeated connection to
the surrounding hydraulically connected distributed drainage system suggests
that basal sediment can be widely accessed and evacuated by meltwater.</p> |
| first_indexed | 2024-12-10T09:18:26Z |
| format | Article |
| id | doaj.art-586732620eb742e6838af181e835bad3 |
| institution | Directory Open Access Journal |
| issn | 1994-0416 1994-0424 |
| language | English |
| last_indexed | 2024-12-10T09:18:26Z |
| publishDate | 2020-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | The Cryosphere |
| spelling | doaj.art-586732620eb742e6838af181e835bad32022-12-22T01:54:46ZengCopernicus PublicationsThe Cryosphere1994-04161994-04242020-09-01142949297610.5194/tc-14-2949-2020A model for interaction between conduits and surrounding hydraulically connected distributed drainage based on geomorphological evidence from Keewatin, CanadaE. L. M. Lewington0S. J. Livingstone1C. D. Clark2A. J. Sole3R. D. Storrar4Department of Geography, University of Sheffield, Sheffield, UKDepartment of Geography, University of Sheffield, Sheffield, UKDepartment of Geography, University of Sheffield, Sheffield, UKDepartment of Geography, University of Sheffield, Sheffield, UKDepartment of Natural and Built Environment, Sheffield Hallam University, Sheffield, UK<p>We identify and map visible traces of subglacial meltwater drainage around the former Keewatin Ice Divide, Canada, from high-resolution Arctic Digital Elevation Model (ArcticDEM) data. We find similarities in the characteristics and spatial locations of landforms traditionally treated separately (i.e. meltwater channels, meltwater tracks and eskers) and propose that creating an integrated map of meltwater routes captures a more holistic picture of the large-scale drainage in this area. We propose the grouping of meltwater channels and meltwater tracks under the term meltwater corridor and suggest that these features in the order of 10s–100s m wide, commonly surrounding eskers and transitioning along flow between different types, represent the interaction between a central conduit (the esker) and surrounding hydraulically connected distributed drainage system (the meltwater corridor). Our proposed model is based on contemporary observations and modelling which suggest that connections between conduits and the surrounding distributed drainage system within the ablation zone occur as a result of overpressurisation of the conduit. The widespread aerial coverage of meltwater corridors (5 %–36 % of the bed) provides constraints on the extent of basal uncoupling induced by basal water pressure fluctuations. Geomorphic work resulting from repeated connection to the surrounding hydraulically connected distributed drainage system suggests that basal sediment can be widely accessed and evacuated by meltwater.</p>https://tc.copernicus.org/articles/14/2949/2020/tc-14-2949-2020.pdf |
| spellingShingle | E. L. M. Lewington S. J. Livingstone C. D. Clark A. J. Sole R. D. Storrar A model for interaction between conduits and surrounding hydraulically connected distributed drainage based on geomorphological evidence from Keewatin, Canada The Cryosphere |
| title | A model for interaction between conduits and surrounding hydraulically connected distributed drainage based on geomorphological evidence from Keewatin, Canada |
| title_full | A model for interaction between conduits and surrounding hydraulically connected distributed drainage based on geomorphological evidence from Keewatin, Canada |
| title_fullStr | A model for interaction between conduits and surrounding hydraulically connected distributed drainage based on geomorphological evidence from Keewatin, Canada |
| title_full_unstemmed | A model for interaction between conduits and surrounding hydraulically connected distributed drainage based on geomorphological evidence from Keewatin, Canada |
| title_short | A model for interaction between conduits and surrounding hydraulically connected distributed drainage based on geomorphological evidence from Keewatin, Canada |
| title_sort | model for interaction between conduits and surrounding hydraulically connected distributed drainage based on geomorphological evidence from keewatin canada |
| url | https://tc.copernicus.org/articles/14/2949/2020/tc-14-2949-2020.pdf |
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