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...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Journal of Coastal Research
2012
|
Subjects: | |
Online Access: | http://journals.fcla.edu/jcr/article/view/78934 |
id |
ftfloridaclaojs:oai:ojs.journals.fcla.edu:article/78934 |
---|---|
record_format |
openpolar |
spelling |
ftfloridaclaojs:oai:ojs.journals.fcla.edu:article/78934 2023-05-15T15:09:26+02:00 Periglacial Shoreline Erosion of a Rocky Coast: George River Estuary, Northern Quebec Fournier, Alain Allard, Michel 2012-06-25 application/pdf http://journals.fcla.edu/jcr/article/view/78934 eng eng Journal of Coastal Research http://journals.fcla.edu/jcr/article/view/78934/76309 Journal of Coastal Research; Vol 8, No 4 (1992): Journal of Coastal Research 0749-0208 Geoscience; Geography; Ocean Science; Oceanography; Marine Science; Coastal Geology; Earth and Environmental Sciences Erosion; frost-riving; sea ice; rock benches; raised shorelines; Ungava Bay info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2012 ftfloridaclaojs 2016-11-23T12:04:32Z 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 Ungava Bay Florida Online Journals (FloridaOJ) Arctic Ungava Bay ENVELOPE(-67.489,-67.489,59.498,59.498) |
institution |
Open Polar |
collection |
Florida Online Journals (FloridaOJ) |
op_collection_id |
ftfloridaclaojs |
language |
English |
topic |
Geoscience; Geography; Ocean Science; Oceanography; Marine Science; Coastal Geology; Earth and Environmental Sciences Erosion; frost-riving; sea ice; rock benches; raised shorelines; Ungava Bay |
spellingShingle |
Geoscience; Geography; Ocean Science; Oceanography; Marine Science; Coastal Geology; Earth and Environmental Sciences Erosion; frost-riving; sea ice; rock benches; raised shorelines; Ungava Bay Fournier, Alain Allard, Michel Periglacial Shoreline Erosion of a Rocky Coast: George River Estuary, Northern Quebec |
topic_facet |
Geoscience; Geography; Ocean Science; Oceanography; Marine Science; Coastal Geology; Earth and Environmental Sciences Erosion; frost-riving; sea ice; rock benches; raised shorelines; Ungava Bay |
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 |
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 |
2012 |
url |
http://journals.fcla.edu/jcr/article/view/78934 |
long_lat |
ENVELOPE(-67.489,-67.489,59.498,59.498) |
geographic |
Arctic Ungava Bay |
geographic_facet |
Arctic Ungava Bay |
genre |
Arctic Sea ice Ungava Bay |
genre_facet |
Arctic Sea ice Ungava Bay |
op_source |
Journal of Coastal Research; Vol 8, No 4 (1992): Journal of Coastal Research 0749-0208 |
op_relation |
http://journals.fcla.edu/jcr/article/view/78934/76309 |
_version_ |
1766340627359858688 |