Modern state and dynamics of the Sea of Azov coasts
Ruben D. Kosyan, Marina V. Krylenko
Shirshov lnstitute of Oceanology, Russian Academy of Sciences (Southem Branch), Gelendzhik, Prostotnaya lg, 353467, Russia
Results: of the modern state researches of the Sea of Azov coasts and coastal processes influencing their evolution are presented. А multidisciplinary study of coastal processes allowed us to identify main types of coast evolution: abrasion, accumulation, and stability. Predominance of abrasion is the main feature of modern dynamics of the Azov shores. Not only the parent rock shores are subjected to erosion, but also accumulative forms are eroded. The eastern coast of the sea retreats most rapidly. The intensity of the abrasion and landslide processes is due to the weak resistance of the rocks composing the coast to the wave forcing. ln particular, intense abrasion occurs in those parts of the coast where wave forcing is strong together with the surges caused Ьу onshore winds, while the beaches are narrow or completely absent. At the same time, the percentage of beach forming fractions in eroded soils is low, and the major part of the abrasion materiaJ in the form of suspended matter is transported to the edeep parts of the sea. ln general, the state and dynamics of the Azov coasts are influenced Ьу abrasion-accumulative processes, sea level fluctuations, changes in the wind-wave regime parameters, and fluctuations in the Ьiogenic beach-forming material volumes. The Ьiogenic factor is the most important in the balance of deposits of accumulation forms (spits and bay-bars). Anthropogenic activity also affects the current state of the shores. The transport of beach-forming alluvial sediments into the sea is reduced because of the regulated river discharge. The natural evolution of onshore processes is disrupted during the development of the coast: agricultural activities, industrial and resort construction, removal of sand and shell material, construction of shore protection facilities.
Spectral structure of surface waves and its inﬂuence on sediment dynamics
Boris V. Divinsky, Ruben D.Kosyan
Shirshov Institute of Oceanology RAS, Moscow, Russia
Analysis of the inﬂuence of wave energy frequency distribution on the dynamics of suspension over the sea-bottom is the main objective of this study. We revealed the differences between the response of the eroded sea-bottom to external disturbances represented by irregular surface waves with permanent integral characteristics (signiﬁcant wave height and frequency of the spectrum peak) and variable frequency of the wave energy distribution.
Проект РНФ 14-17-00547 Отчет 2018 г.(итоговый)
Настоящий отчет отражает ход выполнения проекта в 2018 г. и содержит основные, полученные в ходе выполнения проекта результаты. Приведены также сведения по программе, организации и основных результатах экспедиционных работ.