Author(s): Fabrice Caline; Sebastien Barrault
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Abstract: Six stress sensors were frozen-in in two rosettes nearby a breakwater at 15 cm depth on each side of a tidal crack from 6 to 11 May 2007 in Van Mijenfjorden, Svalbard, Norway. An additional rosette was installed some distance from the shore in the level ice. The tidal movement of the ice was recorded with differential GPS equipment a week later. The tide is being recorded continuously in the area. Weekly visual observations of the sea ice were done as well. This paper gives an order of magnitude of the stresses in the active zone and how they are affected by the tide. The principal stresses next to the tidal crack during one cycle are presented. They are strongly influenced by the tide and are highest, around 150 kPa, at low tide and in the direction parallel to the crack. It is unknown whether these variations are local to the crack or take place in the whole active zone.
Year: 2008