ИСТИНА

In the second half of the XX century and in the beginning of XXI century the main factors affecting the dynamics of the marine margin of the Kuban river Delta has changed significantly. First, sediment runoff of the river has decreased from 9.25 to 1.64 million tons/year. This is a consequence of the creation of the Krasnodar reservoir and anthropogenic reduction of the water runoff of the river. In the period 2001-2010 irreversible water intake in the basin of the Kuban river was equal ~5,2 km3/year. Secondly, the main transit of river sediments to the coastal zone of the Azov sea is now concentrated in only two mouths of the delta branches, while the length of the marine margin of the delta is 139 km The role of marine channels in the distribution of sediments reduced many times. Thirdly, the level of the Azov sea is constantly rising. Intensity of rising sea level on the gauges Temryuk-port, Primorsko-Akhtarsk, Taganrog and Yeysk reaches 4,2 mm/yr (1916-2006), 2,4 mm/yr (1916-2005), 1 mm/yr (1882-1998) and 1,9 mm/yr (1915-1998). Fourth, the volume of production of sea shellfish are reduced. One reason is the deterioration of the quality of river and sea waters. These factors have led in the second half of the XX century to change of the dynamics of the marine margin of the Kuban river Delta and the strengthening the processes of seashore abrasion. Currently, the total length of the zone of seashore abrasion is 61,6% (from total length of delta sea margin), moving forward shores is equal 34%, stable shores is equal 4,4%. The value of coastal retreat reaches 1-4 m/yr. In the future moving forward delta in the sea, even near at the mouths of the main branches of Kuban river delta, stops entirely.