Biogeochemical characteristics of the Sevastopol Bay sedimentation self-purification from radionuclides, mercury and chlorogenic contaminants

Spatial and temporal patters of the formation, distribution and accumulation of bottom sediments in the Cheboksary Reservoir at the current water level for the period from 1981 to 2010 are considered. The prediction of their state is made taking into consideration the increase in the level of the Baltic system to 65 and 68 m. The effect of sedimentation processes on mercury deposition in sediments is determined. Some hydrobiological and social aspects of the problem are considered.

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Peculiarities of Macro- and Microelement Accumulation in Bottom Sediments of the Crimean Coastal Water Areas (the Black Sea) with Different Water Exchange Intensity based on XRF Data

Ekologicheskaya bezopasnost pribrezhnoy i shel fovoy zon morya ◽

10.22449/2413-5577-2021-2-106-120 ◽

2021 ◽

Author(s):

E. A. Kotelyanets ◽

Keyword(s):

Black Sea ◽

Bottom Sediments ◽

Water Exchange ◽

Fluorescence Analysis ◽

The Black Sea ◽

Geochemical Background ◽

Local Pollution ◽

Kerch Strait ◽

Sevastopol Bay ◽

High Concentrations

The paper analyzes content and spatial distribution peculiarities of macro- and microelements in the bottom sediments of Sevastopol bays, Feodosiya Gulf and Kerch Strait. Bottom sediment sampling was performed from 2005 to 2008 as well as in 2015, 2016, and 2018. Concentrations of macro- (Ti, Fe, Mn) and microelements (As, Pb, Zn, Cu, Ni, Co, Cr, V, Sr) were studied by X-ray fluorescence analysis using Spectroscan MAKS-G spectrometer. The maximal content of Cr, Co, Ni, Zn, Pb, Sr exceeding the geochemical background was found in the water areas with difficult water exchange, which include bays of the Sevastopol region under intense anthropogenic influence: the Yuzhnaya Bay, Gollandiya Bay and Kilen-Bay. In the Kazachya Bay, the least polluted in the Sevastopol bay system, the content of Cr, Co, Ni, Zn, Pb, As, Sr also exceeded their geochemical background. As illustrated by the Balaklava Bay, the paper shows the influence of local pollution sources (the Balaklavka River runoff and municipal waste water) on the microelement distribution. Sevastopol bays are characterized by high concentrations of the studied elements in the bottom sediments. In the water areas with active water exchange, i. e. Feodosiya Gulf and Kerch Strait, concentration of the studied elements, except for Ni, Zn and Cr, did not exceed on the average the geochemical background of the open Black Sea shelf areas.

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Estimation of the Range of Variation in the Mineral Composition of Silicate Lake Bottom Sediments Using Data from XRD and XRF

Journal of Siberian Federal University Chemistry ◽

10.17516/1998-2836-0180 ◽

2020 ◽

pp. 260-272

Author(s):

Roman V. Smelyi ◽

Alexander L. Finkelshtein ◽

Igor S. Yakimov ◽

Alena A. Amosova ◽

Victor M. Chubarov

Keyword(s):

Phase Analysis ◽

Mineral Composition ◽

Bottom Sediments ◽

Fluorescence Analysis ◽

X Ray ◽

Group Content ◽

Lake Bottom ◽

Mineral Components ◽

Using Data ◽

Lake Bottom Sediments

A method is proposed for estimating the range of mineral group content in the cores of silicate bottom sediments of lakes based on the search for the minimum and maximum content of stoichiometric minals that make up the group of minerals, provided that the balance of the mineral composition and the content of elements in the sample is observed. The mineral components were determined using the method of qualitative X-ray phase analysis, the contents of the main rock-forming elements were determined by X-ray fluorescence analysis. Comparison with the results of quantitative X-ray phase analysis showed that the contents of mineral groups either lie in the range calculated in the extreme search procedure based on data on the element composition, or overlap with the calculated range within the measurement error. The systematic discrepancy between the results of calculating the range of content of the silicon dioxide phase and the results of quantitative X-ray phase determination of quartz observed for the samples under consideration is due to the presence of an X-ray amorphous phase of biogenic silica. The proposed method for estimating the range of mineral group content is easy to implement, uses the publicly available MS Excel software, and can be useful for estimating variations in mineral composition by core depth, in conditions of frequent shortages of individual sample material distributed between different methods of analysis

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DYNAMICS OF THE NEARSHORE ZONE OF KALAMITSKIY GULF (BLACK SEA) UNDER INFLUENCE OF WIND WAVES

Proceedings of International Conference "Managinag risks to coastal regions and communities in a changinag world" (EMECS'11 - SeaCoasts XXVI) ◽

10.31519/conferencearticle_5b1b948b20d587.32401065 ◽

2017 ◽

Author(s):

Vladimir Fomin ◽

Konstantin Gurov ◽

Vladimir Udovik ◽

...

Keyword(s):

Coastal Zone ◽

Bottom Sediments ◽

Wind Waves ◽

Bottom Topography ◽

Fast Response ◽

Nearshore Zone ◽

Qualitative And Quantitative ◽

Waves And Currents ◽

Quantitative Assessments ◽

Sedimentation Processes

Coastal zone dynamics is especially interesting for interdisciplinary researchers. This is due to general retreat of the coast of the Western Crimea and the fast response in the beach ar-ea. This justifies the need for monitoring of morphodynamic processes in the coastal zone of Crimea with the aim of qualitative and quantitative assessments of modern coastal trans-formation, as well as forecasts of possible changes. XBeach model has been used to simulate dynamics of waves and currents, sediment transport and changes in bottom topography, as well as the processes of drying and flooding of coastal areas. Erosion and sedimentation processes for the bottom sediments of the coastal zone of the Western Crimea have been numerically studied. The bottom profile has been reconstructed on the basis of bathymetric investigations in the coastal zone of the Western Crimea. Numerical simulations have been performed for various parameters of the bed composition and wind waves. Two fractions of bottom sediments have been considered for numerical experiments. The obtained results show that XBeach model can be successfully applied to simulate the bed profile evolution and changes in bottom sediment fractionation.

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DYNAMICS OF THE NEARSHORE ZONE OF KALAMITSKIY GULF (BLACK SEA) UNDER INFLUENCE OF WIND WAVES

Proceedings of International Conference "Managinag risks to coastal regions and communities in a changinag world" (EMECS'11 - SeaCoasts XXVI) ◽

10.21610/conferencearticle_58b4315210e16 ◽

2017 ◽

Author(s):

Vladimir Fomin ◽

Konstantin Gurov ◽

Vladimir Udovik ◽

...

Keyword(s):

Coastal Zone ◽

Bottom Sediments ◽

Wind Waves ◽

Bottom Topography ◽

Fast Response ◽

Nearshore Zone ◽

Qualitative And Quantitative ◽

Waves And Currents ◽

Quantitative Assessments ◽

Sedimentation Processes

Coastal zone dynamics is especially interesting for interdisciplinary researchers. This is due to general retreat of the coast of the Western Crimea and the fast response in the beach ar-ea. This justifies the need for monitoring of morphodynamic processes in the coastal zone of Crimea with the aim of qualitative and quantitative assessments of modern coastal trans-formation, as well as forecasts of possible changes. XBeach model has been used to simulate dynamics of waves and currents, sediment transport and changes in bottom topography, as well as the processes of drying and flooding of coastal areas. Erosion and sedimentation processes for the bottom sediments of the coastal zone of the Western Crimea have been numerically studied. The bottom profile has been reconstructed on the basis of bathymetric investigations in the coastal zone of the Western Crimea. Numerical simulations have been performed for various parameters of the bed composition and wind waves. Two fractions of bottom sediments have been considered for numerical experiments. The obtained results show that XBeach model can be successfully applied to simulate the bed profile evolution and changes in bottom sediment fractionation.

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Polarography of the bottom sediments in the Sevastopol Bay

Physical Oceanography ◽

10.1007/s11110-009-9038-6 ◽

2009 ◽

Vol 19 (2) ◽

pp. 111-123 ◽

Cited By ~ 4

Author(s):

N. A. Orekhova ◽

S. K. Konovalov

Keyword(s):

Bottom Sediments ◽

Sevastopol Bay

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ACCUMULATIONS OF TRACE METALS IN BOTTOM SEDIMENTS OF THE SEVASTOPOL BAY (BLACK SEA)

19th International Multidisciplinary Scientific GeoConference SGEM2019, Water Resources. Forest, Marine and Ocean Ecosystems ◽

10.5593/sgem2019/3.1/s15.083 ◽

2019 ◽

Cited By ~ 1

Author(s):

Konstantin Gurov

Keyword(s):

Trace Metals ◽

Black Sea ◽

Bottom Sediments ◽

Sevastopol Bay

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Polycyclic Aromatic Hydrocarbons in the Bottom Sediments of the River – Sea Mixing Zone on the Example of the River Chernaya and the Sevastopol Bay (the Black Sea)

Physical Oceanography ◽

10.22449/1573-160x-2021-3-338-347 ◽

2021 ◽

Vol 28 (3) ◽

Author(s):

O. V. Soloveva ◽

E. A. Tikhonova ◽

O. A. Mironov ◽

T. O. Barabashin ◽

◽

...

Keyword(s):

Polycyclic Aromatic Hydrocarbons ◽

Contact Zone ◽

Bottom Sediments ◽

Aromatic Hydrocarbons ◽

High Performance ◽

River Estuary ◽

The Black Sea ◽

Chromatography Method ◽

Sevastopol Bay ◽

Polycyclic Aromatic

Purpose. The study is aimed at determining concentrations of the polycyclic aromatic hydrocarbons (PAHs) and at revealing their pattern distribution in the bottom sediments of the "river – sea" contact zone on the example of the Sevastopol Bay and the river Chernaya. Methods and Results. Granulometric composition of the bottom sediments was determined by the decantation and dispersion method. Identification and quantitative determination of PAHs were carried out by the high performance liquid chromatography method. The total PAHs content in the bottom sediments of the area under study varied from 12 to 670 ng/g of dry weight. The pollutant content was minimum in the river site beyond the geochemical barrier. In the area where the river Chernaya flows into the Sevastopol Bay, the PAHs content was 121 ng/g. The highest PAHs content was revealed in the Sevastopol Bay bottom sediments, more precisely, in 1.5 km southwest of the river Chernaya flowing into the bay. 14 PAHs were identified in the estuary zone of the river, 4 of them (naphthalene, 2-methylnaphthalene, fluorene, anthracene) were in the trace amounts. The maximum concentration (99%) of silty material was observed in the Sevastopol Bay water area. The silt fractions were distributed as follows: 20% – aleuritic-pelite fraction, 79% – pelitic-aleurite fraction. Directly in the area of the river inflow into the bay, accumulation of the sand fraction (7%) and the maximum portion of pelitic silts were noted. Conclusions. The recorded values of PAHs corresponded to the natural non-toxic levels. PAHs identified in the bottom sediments of the river estuary zone are of the mixed, predominantly petrogenic origin. The obtained data show that in the conditions of the "river – sea" contact zone, the PAHs accumulation in general and their individual fractions were governed mainly by presence of silt in the bottom sediments.

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