Coastal dune development in a thermokarst environment: Some implications for environmental reconstruction, Tuktoyaktuk Peninsula N.W.T.
The landscape of the Tuktoyaktuk Peninsula coastal plain, Northwest Territories, has been strongly affected by thermokarst processes. Along thermokarst lakes developed in glacio‐fluvial sands lake‐shore dunes are common. Their formation seems related to complete or partial lake drainage. During the...
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ftrepec:oai:RePEc:wly:perpro:v:4:y:1993:i:3:p:255-264 2023-05-15T17:46:48+02:00 Coastal dune development in a thermokarst environment: Some implications for environmental reconstruction, Tuktoyaktuk Peninsula N.W.T. Marie‐Hélène Ruz https://doi.org/10.1002/ppp.3430040307 unknown https://doi.org/10.1002/ppp.3430040307 article ftrepec https://doi.org/10.1002/ppp.3430040307 2020-12-04T13:31:25Z The landscape of the Tuktoyaktuk Peninsula coastal plain, Northwest Territories, has been strongly affected by thermokarst processes. Along thermokarst lakes developed in glacio‐fluvial sands lake‐shore dunes are common. Their formation seems related to complete or partial lake drainage. During the Holocene the rise of relative sea level has induced the submergence of the coastal plain that extended offshore of the present‐day coastal lowlands. Today coastal retreat rates in excess of 1 m/yr result in thermokarst lakes breaching and landward migration of spits and barrier‐islands. A unique type of coastal dune has been observed along two coastal sections. Late Holocene lake‐shore dunes are eroded alongshore and capped by modern coastal dunes. These coastal dunes developed in a thermokarst environment are indicators of lake drainage probably induced by late Holocene sea level rise. La Péninsule de Tuktoyaktuk, Territoires du Nord Ouest, a été grandement affectée par des processus thermokarstiques. Le long des rives des lacs de thermokarst qui se sont formés dans des sables fluvioglaciaires, il est fréquent d'observer des dunes de bord de lac. Leur formation semble ětre en relation avec le drainage partiel ou complet des lacs. Pendant l'Holocène, la hausse du niveau relatif de la mer a provoqué la submergence de la plaine cǒtière qui s'étendait en avant de la plaine cǒtiere actuelle. Actuellement, la cǒte recule a une vitesse de plus de 1 m/an, ce qui induit l'ouverture des lacs de thermokarst qui sont transformés en lagunes ainsi que la migration vers la terre des flèches sableuses et des ǐles‐barrières. Un type unique de dunes cǒtières a été observe le long de la cǒte, Il s'agit d'anciennes dunes de bord de lac, formées à la fin de l'Holocène, qui se retrouvent en position littorale du fait de l'érosion marine et qui sont surmontées par des dunes cǒtières actuelles. Ce nouveau type de dunes cǒtieres est un bon indicateur du drainage des lacs de thermokarst qui, le long de la cǒte est vraisemblablement lié a la hausse du niveau relatif de la mer. Article in Journal/Newspaper Northwest Territories Territoires du Nord-Ouest Thermokarst Tuktoyaktuk RePEc (Research Papers in Economics) Barrier Islands ENVELOPE(-92.283,-92.283,62.784,62.784) Northwest Territories Tuktoyaktuk ENVELOPE(-133.006,-133.006,69.425,69.425) Tuktoyaktuk Peninsula ENVELOPE(-131.339,-131.339,69.750,69.750) Permafrost and Periglacial Processes 4 3 255 264 |
institution |
Open Polar |
collection |
RePEc (Research Papers in Economics) |
op_collection_id |
ftrepec |
language |
unknown |
description |
The landscape of the Tuktoyaktuk Peninsula coastal plain, Northwest Territories, has been strongly affected by thermokarst processes. Along thermokarst lakes developed in glacio‐fluvial sands lake‐shore dunes are common. Their formation seems related to complete or partial lake drainage. During the Holocene the rise of relative sea level has induced the submergence of the coastal plain that extended offshore of the present‐day coastal lowlands. Today coastal retreat rates in excess of 1 m/yr result in thermokarst lakes breaching and landward migration of spits and barrier‐islands. A unique type of coastal dune has been observed along two coastal sections. Late Holocene lake‐shore dunes are eroded alongshore and capped by modern coastal dunes. These coastal dunes developed in a thermokarst environment are indicators of lake drainage probably induced by late Holocene sea level rise. La Péninsule de Tuktoyaktuk, Territoires du Nord Ouest, a été grandement affectée par des processus thermokarstiques. Le long des rives des lacs de thermokarst qui se sont formés dans des sables fluvioglaciaires, il est fréquent d'observer des dunes de bord de lac. Leur formation semble ětre en relation avec le drainage partiel ou complet des lacs. Pendant l'Holocène, la hausse du niveau relatif de la mer a provoqué la submergence de la plaine cǒtière qui s'étendait en avant de la plaine cǒtiere actuelle. Actuellement, la cǒte recule a une vitesse de plus de 1 m/an, ce qui induit l'ouverture des lacs de thermokarst qui sont transformés en lagunes ainsi que la migration vers la terre des flèches sableuses et des ǐles‐barrières. Un type unique de dunes cǒtières a été observe le long de la cǒte, Il s'agit d'anciennes dunes de bord de lac, formées à la fin de l'Holocène, qui se retrouvent en position littorale du fait de l'érosion marine et qui sont surmontées par des dunes cǒtières actuelles. Ce nouveau type de dunes cǒtieres est un bon indicateur du drainage des lacs de thermokarst qui, le long de la cǒte est vraisemblablement lié a la hausse du niveau relatif de la mer. |
format |
Article in Journal/Newspaper |
author |
Marie‐Hélène Ruz |
spellingShingle |
Marie‐Hélène Ruz Coastal dune development in a thermokarst environment: Some implications for environmental reconstruction, Tuktoyaktuk Peninsula N.W.T. |
author_facet |
Marie‐Hélène Ruz |
author_sort |
Marie‐Hélène Ruz |
title |
Coastal dune development in a thermokarst environment: Some implications for environmental reconstruction, Tuktoyaktuk Peninsula N.W.T. |
title_short |
Coastal dune development in a thermokarst environment: Some implications for environmental reconstruction, Tuktoyaktuk Peninsula N.W.T. |
title_full |
Coastal dune development in a thermokarst environment: Some implications for environmental reconstruction, Tuktoyaktuk Peninsula N.W.T. |
title_fullStr |
Coastal dune development in a thermokarst environment: Some implications for environmental reconstruction, Tuktoyaktuk Peninsula N.W.T. |
title_full_unstemmed |
Coastal dune development in a thermokarst environment: Some implications for environmental reconstruction, Tuktoyaktuk Peninsula N.W.T. |
title_sort |
coastal dune development in a thermokarst environment: some implications for environmental reconstruction, tuktoyaktuk peninsula n.w.t. |
url |
https://doi.org/10.1002/ppp.3430040307 |
long_lat |
ENVELOPE(-92.283,-92.283,62.784,62.784) ENVELOPE(-133.006,-133.006,69.425,69.425) ENVELOPE(-131.339,-131.339,69.750,69.750) |
geographic |
Barrier Islands Northwest Territories Tuktoyaktuk Tuktoyaktuk Peninsula |
geographic_facet |
Barrier Islands Northwest Territories Tuktoyaktuk Tuktoyaktuk Peninsula |
genre |
Northwest Territories Territoires du Nord-Ouest Thermokarst Tuktoyaktuk |
genre_facet |
Northwest Territories Territoires du Nord-Ouest Thermokarst Tuktoyaktuk |
op_relation |
https://doi.org/10.1002/ppp.3430040307 |
op_doi |
https://doi.org/10.1002/ppp.3430040307 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
4 |
container_issue |
3 |
container_start_page |
255 |
op_container_end_page |
264 |
_version_ |
1766150665901441024 |