Periglacial Shoreline Erosion of a Rocky Coast: George River Estuary, Northern Quebec
Shore erosion landforms in bedrock were observed along the estuary of George River in a macrotidal periglacial environment. Quarrying of cavities in gneissic bedrock is largely dependent on geological structure, principally on joints and foliations. Frost-riving operating in the jointed rock loosens...
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Journal of Coastal Research
1992
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ftfloridaojojs:oai:journals.flvc.org:article/78934 2023-05-15T15:08:17+02:00 Periglacial Shoreline Erosion of a Rocky Coast: George River Estuary, Northern Quebec Fournier, Alain Allard, Michel 1992-10-22 application/pdf https://journals.flvc.org/jcr/article/view/78934 eng eng Journal of Coastal Research https://journals.flvc.org/jcr/article/view/78934/76309 https://journals.flvc.org/jcr/article/view/78934 Journal of Coastal Research; Vol 8 No 4 (1992): Journal of Coastal Research 0749-0208 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 1992 ftfloridaojojs 2020-11-14T19:13:33Z Shore erosion landforms in bedrock were observed along the estuary of George River in a macrotidal periglacial environment. Quarrying of cavities in gneissic bedrock is largely dependent on geological structure, principally on joints and foliations. Frost-riving operating in the jointed rock loosens preconfigured blocks that are thereafter mobilized by waves and sea ice. Gelifraction and frost shattering along the shore are more effective at places where streamlets flow to the shore and where fresh water seeps throughout the structure. Measurements of erosion profiles were made relative to initially glacial-sculptured intertidal outcrops. Erosional landforms were observed along the whole shoreline length of the study area which was also classified into segments according to slope angle, geographic orientation and fetch. Observations indicate that erosion is more intensive in sectors having low and medium slope angles that allow shore ice to override and where the large fetches favour wave pounding and sea-ice thrusting. The erosion takes place preferentially around the mean high tide level. The knowledge of the acting erosional processes and the resulting landforms allow the recognition of raised bedrock shoreline features associated with post-glacial, uplifted shorelines. These raised bedrock shoreline landforms correspond very well in elevation with the more conspicuous raised shorelines in Quaternary sediments in the region. Some age correlations with major dated Holocene shorelines in the eastern Canadian Arctic are suggested. Article in Journal/Newspaper Arctic Sea ice Florida Online Journals (FloridaOJ) Arctic |
institution |
Open Polar |
collection |
Florida Online Journals (FloridaOJ) |
op_collection_id |
ftfloridaojojs |
language |
English |
description |
Shore erosion landforms in bedrock were observed along the estuary of George River in a macrotidal periglacial environment. Quarrying of cavities in gneissic bedrock is largely dependent on geological structure, principally on joints and foliations. Frost-riving operating in the jointed rock loosens preconfigured blocks that are thereafter mobilized by waves and sea ice. Gelifraction and frost shattering along the shore are more effective at places where streamlets flow to the shore and where fresh water seeps throughout the structure. Measurements of erosion profiles were made relative to initially glacial-sculptured intertidal outcrops. Erosional landforms were observed along the whole shoreline length of the study area which was also classified into segments according to slope angle, geographic orientation and fetch. Observations indicate that erosion is more intensive in sectors having low and medium slope angles that allow shore ice to override and where the large fetches favour wave pounding and sea-ice thrusting. The erosion takes place preferentially around the mean high tide level. The knowledge of the acting erosional processes and the resulting landforms allow the recognition of raised bedrock shoreline features associated with post-glacial, uplifted shorelines. These raised bedrock shoreline landforms correspond very well in elevation with the more conspicuous raised shorelines in Quaternary sediments in the region. Some age correlations with major dated Holocene shorelines in the eastern Canadian Arctic are suggested. |
format |
Article in Journal/Newspaper |
author |
Fournier, Alain Allard, Michel |
spellingShingle |
Fournier, Alain Allard, Michel Periglacial Shoreline Erosion of a Rocky Coast: George River Estuary, Northern Quebec |
author_facet |
Fournier, Alain Allard, Michel |
author_sort |
Fournier, Alain |
title |
Periglacial Shoreline Erosion of a Rocky Coast: George River Estuary, Northern Quebec |
title_short |
Periglacial Shoreline Erosion of a Rocky Coast: George River Estuary, Northern Quebec |
title_full |
Periglacial Shoreline Erosion of a Rocky Coast: George River Estuary, Northern Quebec |
title_fullStr |
Periglacial Shoreline Erosion of a Rocky Coast: George River Estuary, Northern Quebec |
title_full_unstemmed |
Periglacial Shoreline Erosion of a Rocky Coast: George River Estuary, Northern Quebec |
title_sort |
periglacial shoreline erosion of a rocky coast: george river estuary, northern quebec |
publisher |
Journal of Coastal Research |
publishDate |
1992 |
url |
https://journals.flvc.org/jcr/article/view/78934 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_source |
Journal of Coastal Research; Vol 8 No 4 (1992): Journal of Coastal Research 0749-0208 |
op_relation |
https://journals.flvc.org/jcr/article/view/78934/76309 https://journals.flvc.org/jcr/article/view/78934 |
_version_ |
1766339669547548672 |