TY CONF TI PROBLEMS OF THE SHORELINE PROTECTION OF THE IMERITIN VALLEY IN BIG SOCHI KW problems of the shoreline JO XXIV International Coastal Conference "SEA COASTS – EVOLUTION, ECOLOGY, ECONOMY" AU Koff, G.L. AU Balabanov, I.P. AU Barsukova, O.V. PY 2019 PB Academus Publishing