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The cascade water system of the Azov Sea basin is a set of geochemical barriers. Here, water masses of different mineralization mix, and the hydrological and hydrodynamic conditions change. As a result, there is a sharp change in the physical, chemical, and biogeochemical characteristics of all components of the aquatic ecosystem, including bottom sediments. Bottom sediments are a more conservative component of the aquatic landscape in comparison with the water mass. The content of pollutants in the samples taken ...

The article presents the data obtained by the authors during the expedition research in the largest bay of the Azov Sea - the Taganrog Bay. Its characteristic feature is shallowness, flowing due to water exchange with the Don, small rivers, and the development of surge phenomena. The ecosystem of the bay has been experiencing strong anthropogenic pressure for several decades. The authors analyzed the behavior and distribution of mercury dissolved and suspended forms in the surface and bottom layers of water, depen...

The article presents a detailed study of the close relationship between the content of total dissolved iron (Fetotal), Fe2+, Fe3+ on the one hand and physical and chemical parameters (Eh, pH, salinity (S), water temperature, electrical conductivity (Cond), the content of molecular oxygen and its saturation percentage in the section "Don River - Sea of Azov" on the other under various weather conditions. Correlation coefficients, as a quantitative measure of the tightness of the connection, varied over a wide range...

The long-term and high-level anthropogenic load on the aquatic ecosystem increases the probability of its adverse transformations (violations of the natural stability of its state and, as a result, the appearance of negative situations). These include diverse geochemical, biogeochemical, pathogenic biological, and, ultimately, medical and environmental consequences caused by the entry and further redistribution, and accumulation in water of highly toxic chemicals, among which heavy metals such as mercury take prio...

The Azov Sea is one of the shallowest inland reservoirs in Eurasia. The special physical and geographical location of that object determines the temporal variation of its hydrological and hydrochemical characteristics. One of the main features of the sea is the presence of run-off and surging phenomena, determined by water exchange with the Black Sea and the river flow, small area and shallow water body. The currents are considered as significant factors for many processes of matter and energy transport in the Azo...

The Sea of Azov is characterized not only by small sizes and depths for oceanic waters, but also by intensive water exchange with river waters and the waters of the Black sea. These features of the reservoir are superimposed by wind activity, which contributes to the formation of wind surges phenomena. Under their influence, the upper layer of bottom sediments is agitated, accompanied by the transition of previously deposited material into the water column. After the wind action is weakened, the reverse flow of re...

The Don River Delta represent a single hydrographic system, the development of which is characterized by the spatial-temporal variability. The functional role of the individual delta channels and their participation in the distribution of the river flow are different due to significantly different morphological characteristics and stages of development. In turn, this is reflected in the peculiarities of hydrological and hydrochemical processes. In this regard, within the delta the intensity of migration of chemica...

The water column of the Sea of Azov is undergoing significant transformation of Oceanographic characteristics (temperature, salinity, oxygen content). They depend on the seasons and weather situation. In the summer, despite wind activity, observed a classic for the Sea of Azov, the distribution of the parameters: water temperature decrease in the direction of the Don River ? Taganrog Bay ? the central part of the Sea of Azov ? the area of Kerch. In the fall, observed reverse pattern during the relative calm. Durin...