Abstract

Sea ice breakup at the head of Frobisher Bay occurs between mid-June and mid-July. The fractured and sediment-laden ice across the extensive tidal flats which occur in this macrotidal environment breaks up early and ablates rapidly, at a time when the offshore ice is still in place. This results in a very dynamic phase of sediment transport and redistribution within the intertidal zone, which lasts 5 to 7 days. Estimates of sediment loading exceed 63,000 t km2 in some sections of the flats. Small boulders are also entrained within the intertidal ice cover and rafted short distances. Larger boulders are also transported at breakup but no direct observations were made of the mode of boulder transport.

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