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In frame of monitoring of geological environment of the Eastern Gulf of Finland and RFBR project 14-05-00408 the assessment of sea-ice impact on the coastal zone was carried out. The traces of ice plough were fixed on the bottom surface up to the water depth 3 m. The effect of ice impact on coastal erosion is twofold: the ice piling can damage coastal dunes and buildings; on the other hand the formation of solid ice protects the beaches from winter storms and floods.