Аннотация:The most dynamic landforms of the studied coast are sandy beaches. Those are formed at the base of
cliffs partly covering shore platforms developed in low-resistance bedrock. Only glacial boulder loams
are characterized by relatively higher resistance to wave action. Sediment supply from rivers or from
sea bottom erosion is minimal. A significant portion of sediment delivered onto the beaches from the
underwater offshore slope during moderate waves periods is represented by sand previously washed
away from the beaches and cliffs during heavier storms but still remaining above the coastal zone lower
limit. Main source of sediment for beaches are wave erosion and denudation of cliffs. Abrasion occurs only
during heavy storms with typical return period exceeding one year. During periods of low to moderate
wave intensity it in most cases affects colluvial fringes and landslide bodies accumulated along the cliffs
toes rather than cliff faces themselves. Other processes acting on cliffs, mainly landslides, falls and screes
are main contributors into the coastal zone sediment budget. Runoff erosion processes on cliffs are
not intensive. Colluvial material deposited along the cliff toes is sorted and redistributed by waves and
currents. Beach topography experiences active and frequent transformations often at opposite directions.
However certain zones can be distinguished where beaches are relatively stable and others dominated
by beach degradation in longer terms. At some coastline sections sandy beaches become washed away
completely and replaced by shore platforms armored by cobbles and boulders. In most cases such zones
are associated with artificial coastal protection structures with wave-reflecting effect such as embankments
walls, landslide-prevention belts or gabions.