The physicochemical characteristics of the sediments of Balaklava bay: granulometric composition and fractional composition content of organic and inorganic carbon are considered. The spatial distribution of the main factions of particle size distribution and content of organic carbon (TOC) and calcium carbonate (CaCO 3 ) are investigated. The relationship between the organic and inorganic carbon and particle size distribution of sediments are analyzed. The main formation factors of the sediments from Balaklava bay are hightlighted. The results of the performed investigations have shown that the bottom deposits in the Balaklava Bay are represented mainly by silts and in some areas the gravel and sandy materials are interspersed. On average, for all the stations the fine-dispersed fraction content makes up 61%. The coarse-dispersed material is concentrated near the coast, and at the bay exit; the increased content of the sand fraction is typical for the central part of the water area. The calcium carbonate content in the Balaklava Bay varies within 18.32-82.95 %; its average value constitutes 40.06%. Its maximum concentrations are in the coastal parts of the bay. The highest correlation between the inorganic carbon content and the granulometric composition in the samples is observed in the coarse-dispersed material (fraction 2-1 mm). As for the fine-dispersed material, the sandy and alevrite-pelite silts are characterized by the inverse relation: from 0.4 -for the fraction 0.25-0.1 mm up to 0.6 for the fraction lower than 0.05 mm. The organic carbon content varies from 0.66 to 4.74%; the average value is 2.37 %. The presence of the increased values in the central part of the bay can be explained by "weak" water exchange formed by minimum wind and wave effect and insignificant eddy formations. Introduction. Coastal areas have always been an object of active human activity. It has contributed to formation of specific ecosystems which now constitute a part of the total ecosystem of the Black Sea. Study of sediments, their physical and chemical features, as well as the processes taking place in the water -suspended matter -sediments system is an important part of the total system of the coastal waters monitoring.A distinctive feature of the bottom sediments of the Black Sea coastal area is a high rate of sedimentation. In contrast to the deep-sea part where the sedimentation rate is 0.15 -0.35 mm/year [1], this process in the coastal areas increases. According to [2] in the Crimea coastal regions where the determining factor is the abrasion processes, the sedimentation rate is 0.35 mm/year, in the Sevastopol Bay -2.4 mm/year and in the Danube estuarine zone -11.5 mm/year [3].
Sediments on the Crimea southern coast shelf are studied within the Black Sea hygrophysical polygon in Katsiveli. Comparative analysis of the present sediments' parameters in the Crimea shelf zone is done. Physical and chemical characteristics of the bottom sediments (particle-size distribution, humidity, organic carbon content, carbonate content) are studied. The peculiarities of the sedimentation process and the specific features of spatial structure of the bottom sediment fractional composition and the organic matter content are revealed. According to the results of the study it was found that bottom sediments at the testing ground under research are represented generally by silty sands with pebbles and coquina and, to a lesser extent, by aleurite-pelitic silts. Coastal zone sediments are composed of medium sands with the inclusions of shell material and limestone gravel. Seaward part of the testing ground has the aleurite-pelitic silts. The analysis of distribution features of fine bottom sediment fractions and С org showed that a high content of organic carbon is characteristic of fine sediments, and it is evidenced by increased carbon concentrations in the seaward part of the water area. It is shown that the organic carbon content in the bottom sediments on the Crimea southern coast shelf does not exceed the background values. This fact indicates that the existing potential anthropogenic sources (of the Limensky Gulf) of organic carbon currently don't have a significant effect on its accumulation in bottom sediments. The areas of high carbonate concentrations coincide with the areas characterized by decreased content of fine fractions and organic carbon in the bottom sediments. Maximum values of carbonate content in Cape Kikineiz area are related to shell gravel accumulation.
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