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This paper presents some phenomena of the ice cover deformations related to the ice thrusts and piles, and to their disappearance on the shores of lagoons located along the Polish coast of the Baltic Sea. The observations were carried out at different periods, for significant thrusts of ice field and accompanying ice piles i.e., during the winters of 1976, 1993 and 2003. Measurements of the ice thickness by drilling were used to prepare the ice profiles. They allowed a presentation of spatial and temporal variations in thickness of different ice forms in the study area. Wee observed a relation between the length of the thrusted ice sheet and the height of the ice pile. The piles of the ice sheets thrusted closer to the basin usually attained a greater height. The ice sheets thrusted far landward were devoid of piled ice. The melting rate of the ice piled on land depended (mainly) on air temperature. At a mean air temperature of 8.5˚C the melting rate of an ice hummock amounted to 11 cm/24 hours. Frequent disintegration of ice covers and thrusting of the ice fields onto the shore is a destructive factor that enhances the abrasion of the shores.
Key words: ice-sheet thrusts, coastal ice piles, ice hummocks, Southern Baltic Sea, Szczecin Lagoon, Vistula Lagoon