First-year sea ice ridges are a major concern for structures operating in the Arctic offshore and will in many cases give the design mooring load. In this paper, the response of a moored conical floater, somewhat similar to the well-known Kulluk, is studied in first-year ridges. The study is based on model tests performed at Hamburg Ship Model Basin (HSVA) in several ridges with different properties. Mooring forces and floater response, resulting from interaction with different ridges, were compared with respect to ridge properties, ridge behavior, and simulated ice management. Clearance of accumulated rubble upstream the structure was the dominating physical process in the ridge–structure interaction. Accumulation of rubble caused large mooring forces. The amount of accumulated rubble depended on the ridge cross-sectional area, thus the mooring forces increased with ridge cross-sectional area. Large mooring forces were also experienced after the ridge was passed by the structure due to difficulties with clearing of accumulated rubble.
A Moored Arctic Floater in First-Year Sea Ice Ridges
and Coastal Technology (SAMCoT),
Centre for Research-Based Innovation (CRI),
and Technology (NTNU),
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received March 23, 2014; final manuscript received October 13, 2014; published online November 12, 2014. Assoc. Editor: Arne Gürtner.
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Dalane, O., Aksnes, V., and Løset, S. (February 1, 2015). "A Moored Arctic Floater in First-Year Sea Ice Ridges." ASME. J. Offshore Mech. Arct. Eng. February 2015; 137(1): 011501. https://doi.org/10.1115/1.4028814
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