A pilot experiment to measure arctic pack-ice driving forces
Pack-ice driving forces are synonymous with the limiting forces that can be transmitted through pack ice. Knowledge of this topic is important in relation to: ice loads on structures (the limiting driving force approach); ice motion modelling and forecasting; arctic ship routing. Until recently, lim...
| Main Authors: | , , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
1988
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| Subjects: | |
| Online Access: | https://nrc-publications.canada.ca/eng/view/ft/?id=49b2bc95-b5d0-4648-be63-eaf9abcc9c1f https://nrc-publications.canada.ca/eng/view/object/?id=49b2bc95-b5d0-4648-be63-eaf9abcc9c1f https://nrc-publications.canada.ca/fra/voir/objet/?id=49b2bc95-b5d0-4648-be63-eaf9abcc9c1f |
| Summary: | Pack-ice driving forces are synonymous with the limiting forces that can be transmitted through pack ice. Knowledge of this topic is important in relation to: ice loads on structures (the limiting driving force approach); ice motion modelling and forecasting; arctic ship routing. Until recently, limiting pack-ice forces had been speculated upon but never measured. This paper describes a pilot experiment to measure typical values for pack-ice driving forces across a width of several kilometres in the southern Beaufort Sea. In-situ ice pressure sensors were installed near the middle of a multi-year floe. The floe was subject to converging ice conditions and pressure ridging occurred around it. Corresponding compressive ice stresses in the floe were measured from which the average pack-ice forces associated with the observed ridging could be inferred. The paper describes the background to the project, the general approach, the equipment used, and the results obtained. Les forces agissantes des banquises désignent les forces limitatives qui peuvent s'exercer dans celles-ci. La compréhension de ce phénomène est importante pour: la détermination des charges de glace s'exercant sur les structures (la méthode des forces agissantes limitatives); la modélisation et la prévision du mouvement des glaces; la fixation de l'itinéraire des navires dans l'Arctique. Jusqu'à récemment, on avait spéculé sur les forces limitatives des banquises mais sans jamais les mesurer. Ce document décrit une expérience pilote visant à déterminer des valeurs types des forces agissante des banquises sur une distance de plusieurs kilomètres, dans la partie sud de la mer de Beaufort. Des capteurs de poussée des glaces in situ ont été installés près du milieu d'un floe pluriannuel. Le floe était soumis à des conditions de glaces convergentes et un encre'tement s'est produit autour de lui. On a mesuré les contraintes de compression correspondantes qui s'exercaient dans le floe, puis on en a déduit les forces de banquises moyennes liées à ... |
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