Author(s): Aleksandra Visich; Aleksey Marchenko

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Abstract: The project work included experiments in the cold laboratory of the University Centre in Svalbard and in­situ observations of land fast ice in the Van Mijen Fjord, Spitsbergen. The laboratory experiments were performed in 2018­2019 to investigate thermal response of ice samples due to cyclic changes of the room temperature and due to the freezing of water in the preliminary made ice cuts. The samples of natural lake ice and sea ice were used for the experiments. Duration of each laboratory experiment with lake ice and sea ice was of about one month. Granular structure of ice formed inside the cracks was investigated by thin section analysis in the laboratory and in the field conditions. Fiber optics sensors AOS GmbH were used to measure ice strains and temperatures in the laboratory. It was discovered that ice deformations are mostly related to the release of the latent heat during the water freezing in the cracks. Numerical simulations in COMSOL Multiphysics were performed to calculate the ice stresses near the crack caused by the heat transfer from the freezing water.

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Year: 2020