Yeremenko Ye. A., Zhiba R. Yu., Kuznetsov M. A., Bolysov S. I.

The Coastal Morphology of Gagra Bay  and the Modern Trends of the Development  of the Conditions of Sea Level Increase           P. 149-163.

UDC 551.435.37(262.5)

DOI 10.37724/RSU.2022.75.2.015

Abstract. The article focuses on the morphogenetic types of the Black Sea coastline of Gagra. The article maintains that Gagra Bay is characterized by technogenous coastal defence structures, such as seawalls and rubble groynes, submerged and underwater breakwaters, riprap. In 2022, longitudinal bank protection structures function rather efficiently despite being partially destroyed. Transverse structures are mostly demolished. However, there are transverse structures that perform their coastal defence function. Beaches
of Gagra are a coastline of pebble or sand and pebble beaches over 25–35 m wide. In some places beaches are 10 m wide. To the west of the Zhwawa-Kwara River sediment production is limited because of the mole built in 1914–1916 and because of another mole built in the Imeretian resort of the Russian Federation. The deficit of river sediments in the southern part of Gagra is due to partial sediment interception by Gagra rubble groynes. It is also due to the fact that the place is far from the Zhwawa-Kwara River and the Bzyb River where sediments are formed. In the 1980s the beaches of Gagra were restored and were wider. However, in the recent 10 years their width has been reducing due to the impact of coastal defence structures and sea level increase coupled with sediment supply reduction in the north-west, which is the principle sediment supply in Gagra

 

Keywords: coastal erosion, coastline structures, Gagra, pebble beaches, coastline dynamics, sea level increase, Black Sea.

 

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