Sediment dynamics in paired High Arctic lakes revealed from high-resolution swath bathymetry and acoustic stratigraphy surveys
High Arctic lakes are commonly used for paleoclimatic reconstructions because they are particularly sensitive to climate variability. However, the processes leading to sediment deposition and distribution in these lakes are often poorly understood. Here for the first time in the Canadian High Arctic...
Published in: | Journal of Geophysical Research: Earth Surface |
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ftunivgent:oai:archive.ugent.be:8761150 2023-06-11T04:08:46+02:00 Sediment dynamics in paired High Arctic lakes revealed from high-resolution swath bathymetry and acoustic stratigraphy surveys Normandeau, A. Lamoureux, S. F. Lajeunesse, P. Francus, Pierre 2016 application/pdf https://biblio.ugent.be/publication/8761150 http://hdl.handle.net/1854/LU-8761150 https://doi.org/10.1002/2016JF003873 https://biblio.ugent.be/publication/8761150/file/8761151 eng eng https://biblio.ugent.be/publication/8761150 http://hdl.handle.net/1854/LU-8761150 http://dx.doi.org/10.1002/2016JF003873 https://biblio.ugent.be/publication/8761150/file/8761151 No license (in copyright) info:eu-repo/semantics/restrictedAccess JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE ISSN: 2169-9003 ISSN: 2169-9011 Earth and Environmental Sciences SUBMARINE MASS MOVEMENTS ST-LAWRENCE ESTUARY ENVIRONMENTAL-CHANGE LACUSTRINE VARVES CONTINENTAL-SLOPE RIVER-DELTA CAPE BOUNTY CANADA RECORD ISLAND journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftunivgent https://doi.org/10.1002/2016JF003873 2023-05-10T22:50:11Z High Arctic lakes are commonly used for paleoclimatic reconstructions because they are particularly sensitive to climate variability. However, the processes leading to sediment deposition and distribution in these lakes are often poorly understood. Here for the first time in the Canadian High Arctic, we present original data resulting from swath bathymetry and subbottom surveys carried out on two lakes at Cape Bounty, Melville Island. The results reveal the dynamic nature of the lakes, in which mass movement deposits and bedforms on the deltas reflect frequent slope instabilities and hyperpycnal flow activity. The analysis of the mass movement deposits reveals that small blocky debris flows/avalanches, debris flows, and a slide occurred during the Holocene. These mass movements are believed to have been triggered by earthquakes and potentially by permafrost thawing along the shoreline. Altogether, these mass movement deposits cover more than 30% of the lake floors. Additionally, the river deltas on both lakes were mapped and reveal the presence of several gullies and bedforms. The presence of gullies along the delta front indicates that hyperpycnal flows generated at the river mouth can transport sediment in different trajectories downslope, resulting in a different sediment accumulation pattern and record. The dynamic nature of these two lakes suggests that further analysis on sedimnt transport and distribution within Arctic lakes is required in order to improve paleoclimatic reconstructions. Article in Journal/Newspaper Arctic permafrost Melville Island Ghent University Academic Bibliography Arctic Canada Cape Bounty ENVELOPE(-109.542,-109.542,74.863,74.863) Journal of Geophysical Research: Earth Surface 121 9 1676 1696 |
institution |
Open Polar |
collection |
Ghent University Academic Bibliography |
op_collection_id |
ftunivgent |
language |
English |
topic |
Earth and Environmental Sciences SUBMARINE MASS MOVEMENTS ST-LAWRENCE ESTUARY ENVIRONMENTAL-CHANGE LACUSTRINE VARVES CONTINENTAL-SLOPE RIVER-DELTA CAPE BOUNTY CANADA RECORD ISLAND |
spellingShingle |
Earth and Environmental Sciences SUBMARINE MASS MOVEMENTS ST-LAWRENCE ESTUARY ENVIRONMENTAL-CHANGE LACUSTRINE VARVES CONTINENTAL-SLOPE RIVER-DELTA CAPE BOUNTY CANADA RECORD ISLAND Normandeau, A. Lamoureux, S. F. Lajeunesse, P. Francus, Pierre Sediment dynamics in paired High Arctic lakes revealed from high-resolution swath bathymetry and acoustic stratigraphy surveys |
topic_facet |
Earth and Environmental Sciences SUBMARINE MASS MOVEMENTS ST-LAWRENCE ESTUARY ENVIRONMENTAL-CHANGE LACUSTRINE VARVES CONTINENTAL-SLOPE RIVER-DELTA CAPE BOUNTY CANADA RECORD ISLAND |
description |
High Arctic lakes are commonly used for paleoclimatic reconstructions because they are particularly sensitive to climate variability. However, the processes leading to sediment deposition and distribution in these lakes are often poorly understood. Here for the first time in the Canadian High Arctic, we present original data resulting from swath bathymetry and subbottom surveys carried out on two lakes at Cape Bounty, Melville Island. The results reveal the dynamic nature of the lakes, in which mass movement deposits and bedforms on the deltas reflect frequent slope instabilities and hyperpycnal flow activity. The analysis of the mass movement deposits reveals that small blocky debris flows/avalanches, debris flows, and a slide occurred during the Holocene. These mass movements are believed to have been triggered by earthquakes and potentially by permafrost thawing along the shoreline. Altogether, these mass movement deposits cover more than 30% of the lake floors. Additionally, the river deltas on both lakes were mapped and reveal the presence of several gullies and bedforms. The presence of gullies along the delta front indicates that hyperpycnal flows generated at the river mouth can transport sediment in different trajectories downslope, resulting in a different sediment accumulation pattern and record. The dynamic nature of these two lakes suggests that further analysis on sedimnt transport and distribution within Arctic lakes is required in order to improve paleoclimatic reconstructions. |
format |
Article in Journal/Newspaper |
author |
Normandeau, A. Lamoureux, S. F. Lajeunesse, P. Francus, Pierre |
author_facet |
Normandeau, A. Lamoureux, S. F. Lajeunesse, P. Francus, Pierre |
author_sort |
Normandeau, A. |
title |
Sediment dynamics in paired High Arctic lakes revealed from high-resolution swath bathymetry and acoustic stratigraphy surveys |
title_short |
Sediment dynamics in paired High Arctic lakes revealed from high-resolution swath bathymetry and acoustic stratigraphy surveys |
title_full |
Sediment dynamics in paired High Arctic lakes revealed from high-resolution swath bathymetry and acoustic stratigraphy surveys |
title_fullStr |
Sediment dynamics in paired High Arctic lakes revealed from high-resolution swath bathymetry and acoustic stratigraphy surveys |
title_full_unstemmed |
Sediment dynamics in paired High Arctic lakes revealed from high-resolution swath bathymetry and acoustic stratigraphy surveys |
title_sort |
sediment dynamics in paired high arctic lakes revealed from high-resolution swath bathymetry and acoustic stratigraphy surveys |
publishDate |
2016 |
url |
https://biblio.ugent.be/publication/8761150 http://hdl.handle.net/1854/LU-8761150 https://doi.org/10.1002/2016JF003873 https://biblio.ugent.be/publication/8761150/file/8761151 |
long_lat |
ENVELOPE(-109.542,-109.542,74.863,74.863) |
geographic |
Arctic Canada Cape Bounty |
geographic_facet |
Arctic Canada Cape Bounty |
genre |
Arctic permafrost Melville Island |
genre_facet |
Arctic permafrost Melville Island |
op_source |
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE ISSN: 2169-9003 ISSN: 2169-9011 |
op_relation |
https://biblio.ugent.be/publication/8761150 http://hdl.handle.net/1854/LU-8761150 http://dx.doi.org/10.1002/2016JF003873 https://biblio.ugent.be/publication/8761150/file/8761151 |
op_rights |
No license (in copyright) info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/2016JF003873 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
121 |
container_issue |
9 |
container_start_page |
1676 |
op_container_end_page |
1696 |
_version_ |
1768382257808015360 |