Author(s): Morten Bjerkas; Basile Bonnemaire
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Abstract: Part II of this paper addresses the ice loads from interactions between first-year ice ridges and a lighthouse in brackish water. Altogether 33 relatively small ice ridges that interacted with the Norstromsgrund Lighthouse were selected and studied in detail. The most significant loads from ice ridges seem to be concentrated in the upper part of the ridge, from the water line and below. From crushing failure of ridges, a concentration of loads is observed parallel to the drift direction. When ice ridges fail on a rubble wedge, loads seem to be concentrated on the two borders of the rubble wedge, usually ±90° to the drift direction. The load levels are usually small. The loads from ridges are 0.5 to 6 times higher than from the surrounding ice sheet. The ridge loads are in the same range as those from level ice crushing events. Loads from ice ridges seem to increase with the sail height. It was found no proof to claim that loads from ice ridges exceed the loads from level ice sheets.
Year: 2004