CGRG Bibliography of Canadian Geomorphology
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Author : Barrie, J.V.; Collins, W.T.; Clark, J.I.; Lewis, C.F.M.; and Parrott, D.R.
Date : 1986.
Title : Submersible observations and origin of an iceberg pit on the Grand Banks of Newfoundland
Publication : St. John's, Nfld. : Memorial University. Centre for Cold Oceans Resources Engineering, Publication
Issue : 86(8).
Page(s) : 8 p.
Abstract
An elongated seabed depression 125 by 80 m and 10 m deep was investigated using a manned submersible in October, 1984 and again in August, 1985 on the Grand Banks of Newfoundland. This pit in 87 m of water is typical of a small population of depressions found that indent the seabed up to seven times deeper than the deepest iceberg furrows in the same area and in similar water depths. This feature, although not associated with a typical iceberg furrow, is interpreted as a seabed response to impact and loading by a rolling and grounding iceberg. Side berms up to 2.5 m above the seabed were formed as the iceberg was displaced in a southward direction where it came hard aground. Subsequent failure of the underlying silt and clay Tertiary beds resulted in an overdeepened pit. This enlargement was probably the result of combined vertical loading with an increased iceberg draught, and current or wave-induced horizontal loading causing passivefailures. The iceberg pit appears to be of recent origin.
Bibliography of Canadian Geomorphology