Review of Surficial Geology and Engineering Hazards in the Canadian Offshore
Surficial geological mapping and hydrographic charting is most complete in the Atlantic Provinces offshore including the Gulf of St. Lawrence; secondarily, the British Columbia offshore and the Labrador Shelf and Slope are fairly well mapped and charted. However, the entire Arctic offshore has the p...
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Atlantic Geoscience Society
1979
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ftuninewbrunojs:oai:ojs.journals.lib.unb.ca:article/1354 2023-05-15T13:22:57+02:00 Review of Surficial Geology and Engineering Hazards in the Canadian Offshore Pelletier, Bernard R. 1979-10-10 application/pdf https://journals.lib.unb.ca/index.php/ag/article/view/1354 eng eng Atlantic Geoscience Society https://journals.lib.unb.ca/index.php/ag/article/view/1354/1729 https://journals.lib.unb.ca/index.php/ag/article/view/1354 Copyright (c) 2015 Atlantic Geology Atlantic Geoscience; Vol. 15 No. 2/3 (1979) 2564-2987 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion meeting-report 1979 ftuninewbrunojs 2022-07-11T11:41:14Z Surficial geological mapping and hydrographic charting is most complete in the Atlantic Provinces offshore including the Gulf of St. Lawrence; secondarily, the British Columbia offshore and the Labrador Shelf and Slope are fairly well mapped and charted. However, the entire Arctic offshore has the poorest geological and hydrographic coverage of all Canadian marine waters, with the exceptions of Hudson Bay, Beaufort Sea-Amundsen Gulf area and Lancaster Sound. For safe marine operations, environmental information is required on winds, storms, waves, currents, tides and sea ice. This background is complemented by a seabed study designed to obtain grab and dredge samples of sediment or rock; to obtain sediment cores with the vibracorer, and gravity and piston corers; to obtain bedrock cores with the use of the diamond drill; to obtain bathymetric maps by means of sonic surveys in which echograms reveal the topographic profile of the sea-floor, and the side scan sonar give the area! view; to obtain details of bedrock features such as bedding, folds, faults, as well as distinguishing erosional and constructional topographic features all for the purposes of geological mapping; and to carry out visual surveys remotely or directly by means of submersible equipment and vehicles. All these background data and survey results can have direct application to seabed engineering problems. Potential hazards related to surficial geology in the Canadian offshore affect engineering operations such as drilling, dredging, dumping coastal works, foundations and anchorages, cable lays, and pipelines. These hazards are grouped into five main categories: (I) erosion and sedimentation, (2) Morphology, (S) movement, (4) ground ice, and (5) sediments. A breakdown is given as follows: ice-scour grooves and ridges, current scour and fill, buried river channels, sand waves, megaflutes, sand bars, valleys, fjords, canyons, troughs, thermokarst, pingos, mud diapirs, poakmarks, scarps, terraces, hummocky terrain, slump features, bedding ... Article in Journal/Newspaper Amundsen Gulf Arctic Beaufort Sea Hudson Bay Lancaster Sound Sea ice Thermokarst University of New Brunswick: Centre for Digital Scholarship Journals Arctic Hudson Hudson Bay Labrador Shelf ENVELOPE(-58.000,-58.000,56.000,56.000) Lancaster Sound ENVELOPE(-83.999,-83.999,74.218,74.218) Atlantic Geology 15 2 |
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Open Polar |
collection |
University of New Brunswick: Centre for Digital Scholarship Journals |
op_collection_id |
ftuninewbrunojs |
language |
English |
description |
Surficial geological mapping and hydrographic charting is most complete in the Atlantic Provinces offshore including the Gulf of St. Lawrence; secondarily, the British Columbia offshore and the Labrador Shelf and Slope are fairly well mapped and charted. However, the entire Arctic offshore has the poorest geological and hydrographic coverage of all Canadian marine waters, with the exceptions of Hudson Bay, Beaufort Sea-Amundsen Gulf area and Lancaster Sound. For safe marine operations, environmental information is required on winds, storms, waves, currents, tides and sea ice. This background is complemented by a seabed study designed to obtain grab and dredge samples of sediment or rock; to obtain sediment cores with the vibracorer, and gravity and piston corers; to obtain bedrock cores with the use of the diamond drill; to obtain bathymetric maps by means of sonic surveys in which echograms reveal the topographic profile of the sea-floor, and the side scan sonar give the area! view; to obtain details of bedrock features such as bedding, folds, faults, as well as distinguishing erosional and constructional topographic features all for the purposes of geological mapping; and to carry out visual surveys remotely or directly by means of submersible equipment and vehicles. All these background data and survey results can have direct application to seabed engineering problems. Potential hazards related to surficial geology in the Canadian offshore affect engineering operations such as drilling, dredging, dumping coastal works, foundations and anchorages, cable lays, and pipelines. These hazards are grouped into five main categories: (I) erosion and sedimentation, (2) Morphology, (S) movement, (4) ground ice, and (5) sediments. A breakdown is given as follows: ice-scour grooves and ridges, current scour and fill, buried river channels, sand waves, megaflutes, sand bars, valleys, fjords, canyons, troughs, thermokarst, pingos, mud diapirs, poakmarks, scarps, terraces, hummocky terrain, slump features, bedding ... |
format |
Article in Journal/Newspaper |
author |
Pelletier, Bernard R. |
spellingShingle |
Pelletier, Bernard R. Review of Surficial Geology and Engineering Hazards in the Canadian Offshore |
author_facet |
Pelletier, Bernard R. |
author_sort |
Pelletier, Bernard R. |
title |
Review of Surficial Geology and Engineering Hazards in the Canadian Offshore |
title_short |
Review of Surficial Geology and Engineering Hazards in the Canadian Offshore |
title_full |
Review of Surficial Geology and Engineering Hazards in the Canadian Offshore |
title_fullStr |
Review of Surficial Geology and Engineering Hazards in the Canadian Offshore |
title_full_unstemmed |
Review of Surficial Geology and Engineering Hazards in the Canadian Offshore |
title_sort |
review of surficial geology and engineering hazards in the canadian offshore |
publisher |
Atlantic Geoscience Society |
publishDate |
1979 |
url |
https://journals.lib.unb.ca/index.php/ag/article/view/1354 |
long_lat |
ENVELOPE(-58.000,-58.000,56.000,56.000) ENVELOPE(-83.999,-83.999,74.218,74.218) |
geographic |
Arctic Hudson Hudson Bay Labrador Shelf Lancaster Sound |
geographic_facet |
Arctic Hudson Hudson Bay Labrador Shelf Lancaster Sound |
genre |
Amundsen Gulf Arctic Beaufort Sea Hudson Bay Lancaster Sound Sea ice Thermokarst |
genre_facet |
Amundsen Gulf Arctic Beaufort Sea Hudson Bay Lancaster Sound Sea ice Thermokarst |
op_source |
Atlantic Geoscience; Vol. 15 No. 2/3 (1979) 2564-2987 |
op_relation |
https://journals.lib.unb.ca/index.php/ag/article/view/1354/1729 https://journals.lib.unb.ca/index.php/ag/article/view/1354 |
op_rights |
Copyright (c) 2015 Atlantic Geology |
container_title |
Atlantic Geology |
container_volume |
15 |
container_issue |
2 |
_version_ |
1766368105350561792 |