The article provides information and discusses results of the year-round observations of the strength properties of flat and deformed ice at the research site in the Khatanga Bay (Laptev Sea). Field work was carried out by the Far Eastern Federal University and Arctic and Antarctic Research Institute in 2019-2020 as part of the Rosneft's research program. Obtained results significantly expanded understanding of the seasonal changes of the strength characteristics of deformed sea ice (hummocks and stamukhas), and also made it possible to determine temperature and strength distribution within the boundaries of an ice formation, that is fundamentally important for assessing its impact on engineering structures. One of the important conclusions is that the ridge sail acts as heat isolation - ice in the keel of the ridge under sail is significantly warmer than ice in the keel outside the sail area. Period when hummocks and stamukhas pose the maximum threat to offshore structures is also determined. These results can be used during design and operations of infrastructure facilities for exploration, production and transportation of hydrocarbons in ice waters of the Russian continental shelf, as well as for conceptual research of marine logistics issues related to the transportation of hydrocarbons along the Northern Sea Route. Adequate thermal and strength models of ice formations are very important for correct implementation of numerical and basin modeling and assessment of ice loads on offshore oil and gas field structures.
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