EVALUATION OF LONGSHORE TRANSPORT OF SEDIMENTS IN LITHODYNAMIC SYSTEMS (BY THE EXAMPLE OF THE COAST SECTION BETWEEN TUAPSE AND ADLER) 

V. A. Petrov^1,*, N. A. Yaroslavtsev¹

¹TsNIIS Joint Stock Co. Branch, “Sea shores” Research Center, ul. Yana Fabritsiusa 1, Sochi, 354002 Russia

*E-mail:demmi8@mail.ru

The coast between Tuapse and Adler is a part of a lithodynamic system that stretches for 160 km from Tuapse to Cape Pitsunda in Abkhazia, distinguished by the presence of a single longshore transport of pebble beds. Taking into account the natural factors that affect the intensity of coastal processes changing along the stretch of this system, smaller lithodynamic elements are distinguished within it: the lithodynamic subsystems, areas and sections, their borders being determined by the position of the river mouths and the coastline configuration. Six lithodynamic subsystems are identified within the considered coastal section along the mouths of large rivers, which are the main sources of coarse blocky rock fragments coming to beaches. Two of them became autonomous currently due to the construction of protective breakwaters in the Sochi and Imereti seaports, which interrupted the longshore flow of pebble sediments. The longshore flow of pebble sediments is one of the leading factors controlling the state of beaches. The existing procedures for determining its discharge involve a large amount of calculations. We proposed to estimate this value according to the dependence that includes the wave parameters calculated from the energy resultant of a steady wave in deep water obtained from the energy flows of waves in each wave-dangerous direction. The parameters of the resultant wave in deep water will be the same for sections of the coast with the same directions of wave approach. To calculate the sediment flow rate based on the parameters of the active wave after the collapse, its values in deep water are transferred to the coastal zone. A comprehensive analysis of natural conditions within small lithodynamic elements will allow a more reliable assessment of morpho-lithodynamic processes occurring within the coastal zone at the site of restoration of lost pebble beaches, which will increase the effectiveness of the measures taken

Key words: height and period of waves, lithodynamic system, flux of wave energy

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