Outcome of the interaction between drifting ice and the seabed
Iceberg drifting into shallower waters and gouging the seabed as it comes into contact with it.Drifting sea ice pressure ridges can also gouge the seabed.
Seabed gouging by ice is a process that occurs when floating ice features (typically icebergs and sea ice ridges) drift into shallower areas and their keel comes into contact with the seabed.[1][2][3] As they keep drifting, they produce long, narrow furrows most often called gouges, or scours.[4][5][6] This phenomenon is common in offshore environments where ice is known to exist. Although it also occurs in rivers and lakes,[7][8] it appears to be better documented from oceans and sea expanses.[2][4][5]
Seabed scours produced via this mechanism should not be confused with strudel scours. These result from spring run-off water flowing onto the surface of a given sea ice expanse, which eventually drains away through cracks, seal breathing holes, etc. The resulting turbulence is strong enough to carve a depression into the seabed. Seabed scouring by ice should also be distinguished from another scouring mechanism: the erosion of the sediments around a structure due to water currents, a well known issue in ocean engineering and river hydraulics[9] – see bridge scour.
^King 2011
^ abPalmer & Been 2011
^Barrette 2011
^ abWadhams 2000, p. 72
^ abWeeks 2010, Ch. 13
^Other less frequently used synonyms include ploughs and scores
^Noble and Comfort 1982
^Grass 1984
^See Annandale 2006, for instance
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