GEOSCAN, résultats de la recherche


TitreEffect of sea ice on Beaufort Sea coastal processes
AuteurArctec Newfoundland Ltd.
SourceCommission géologique du Canada, Dossier public 1688, 1987, 205 pages, (Accès ouvert)
Documentdossier public
Mediapapier; en ligne; numérique
ProvinceYukon; Région extracotière du nord; Territoires du Nord-Ouest
SNRC107; 117A; 117D; 117E; 117H
Lat/Long OENS-140.0000 -128.0000 72.0000 68.0000
Sujetsbathymétrie; glace marine; littoraux; caractéristiques de la côte; transport des sediments; établissement de modèles; sedimentation; érosions par la glace; études côtières; érosion; topographie; géologie marine; géologie des dépôts meubles/géomorphologie; sédimentologie; Quaternaire
Illustrationscharts; tables; sketch maps
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27,00 $
Diffusé1988 04 01; 2011 12 23
Résumé(Sommaire disponible en anglais seulement)
The consideration of shoreface developments for the Canadian Beaufort Sea makes it important to understand the prevailing coastal processes. This northern environment is unique in that sea ice is a major component. This study has been conducted to investigate the significance of sea ice for Beaufort Sea shoreline processes and to identify critical information gaps to guide the planning of future research efforts. The study was conducted by reviewing available data on coastal morphology, sediment transport and sea ice to develop conceptual models for shore/ice interaction processes, and developing first approximation numerical estimates of their significance in the Canadian Beaufort. Assessments were then made of their potential significance for coastal development at King Point and North Head. A number of processes were identified by which sea ice may affect the littoral zone. These fall into two general classes, as follows:
(a) Modification of marine-related sediment transport mechanisms (e.g. waves).
(b) Interactions in which sea ice directly works the beach or is responsible for sediment transport.
Processes in the former category include the limitation of the annual duration of open water conditions; the limitation of wave energy produced in the coastal environment; and the attenuation of wave energy reaching the beach. The latter category above includes ice scour and ice push; ice override of shorelines; ice wallowing; strudel scour; and the transport of sediment adhered to, encapsulated in and deposited on the ice sheet; and abrasion by frazil ice. On a regional scale, the predominant effect of sea ice is believed to be its effect on marine-related sediment transport. First cut approximations suggest that ice-related processes could be responsible for a large percentage of the Beaufort Sea sediment budget. Ice action may significantly affect local sites both by modifying marine-related sediment transport mechanisms and by reworking the beach.