Regularities of the formation of the granulometric composition of the bottom and beach deposits of the Anapa bay bar

As a result of the field studies conducted in 2010 of the spatial and temporal variability of the granulometric composition of the bottom and beach deposits of the southern part of the Anapa bay bar, the tendency of a decrease in the average size of the particles under the southward flow of the deposits of the coastal zone was revealed. The comparison of the data obtained in 1949, 1979, and 2010 shows that the average diameter of the particles in the deposits of the underwater slope also gradually decreases over the time. It was established that, with the decreasing of the particle sizes down to 0.1 mm, their nonrecoverable deposition to a depth of more than 7 m increases. Since, in the southern edge of the Anapa bay bar, over 70% of the bottom and about 60% of the beach deposits are represented by fractions smaller 0.16 mm, at this site the mass deposition of the sand material to a depth occurs. Based on the data obtained, the particle size of the sandy material recommended for the restoration of the beaches of the southern part of the Anapa bay bar was determined.