Organic Matter and Grain-Size Distribution of the Modern Bottom Sediments in the Balaklava Bay (the Black Sea)

Orekhova, N. A.; Ovsyany, E. I.; Gurov, K. I.; Popov, M. A.

doi:10.22449/1573-160x-2018-6-479-488

Cited by 8 publications

(9 citation statements)

References 5 publications

(7 reference statements)

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“…According to [1,5,13,14], the bottom sediments of the bay are predominantly represented by fine silts and silty sands with inclusions of separated shells and shell detritus; an increase in the proportion of coarse-grained stone gravel is noted near the coast.…”

Section: Research Results and Their Discussionmentioning

confidence: 99%

Pollutants in Bottom Sediments in the Balaklava Bay (the Black Sea)

Kotelyanets¹,

Gurov²,

Tikhonova³

et al. 2019

PhO

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The purpose of the paper consists in studying the pollution level, and the character of spatial distribution of microelements and trace metals, the chlorophorm-extractable substances and petroleum hydrocarbons and in evaluating the features of their accumulation in the upper layer of bottom sediments in the Balaklava Bay depending on the natural and anthropogenic sources of pollutants. Methods and Results. The samples were taken from the bottom sediments upper layer (0-5 cm) in the Balaklava Bay by the Peterson grabber in February, 2015. Location of the sampling stations was chosen proceeding from the features of the bay morphometry, hydrological and hydrochemical water structure, pollution sources and the character of the sedimentation processes. The samples were selected, preprocessed and analyzed by the standard methods according to the regulatory documents. Some changes in relation between the clay fractions and the gravel material composition were revealed. The correlation dependence between the contents of chlorophorm-extractable substances and petroleum hydrocarbons was calculated. The features of spatial distribution of the metals' content depending on the natural geochemical processes in the bottom sediments are revealed. The regions subjected to the most intensive anthropogenic load within the region under study are distinguished. Conclusions. The content of clay material in all the samples taken in the Balaklava Bay on the average increased from 58.2 to 65.9 % and its maximum values are still concentrated in the western and northwestern parts of the water area under study. During last ten years, growth of the portion of a fine-grained material in the bottom fractions has been noted; at that the places where it accumulats are located in the areas of intense anthropogenic activity. The chlorophorm-extractable substances concentration in the Balaklava Bay bottom sediments varied within a wide range. On the whole, in course of the investigated period their content decreased, whereas the petroleum hydrocarbons concentration remained unchanged. It is found that pollution of the bottom sediments by metals is of a polyelemental nature and is characterized primarily by such metals as Pb, Cr, Zn, Cu and Sr. The increased microelements concentrations are observed in the northeastern and central parts of the water area, whereas the decreased metal concentrationsin its northwestern and eastern parts.

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Section: Research Results and Their Discussionmentioning

confidence: 99%

Pollutants in Bottom Sediments in the Balaklava Bay (the Black Sea)

Kotelyanets¹,

Gurov²,

Tikhonova³

et al. 2019

PhO

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“…Первые современные сведения касались физико-химических свойств донных отложений, состава и количественных характеристик макрозообентоса [3]. Сейчас большое внимание уделяется загрязнению донных отложений бухты органическими веществами [4,5] и тяжелыми металлами [6,7]. В работах [5,7] отмечено, что фракционный состав в поверхностном слое донных отложений изменился, в первую очередь вследствие увеличения доли мелкозернистого материала.…”

Section: Mathematical Modeling the Dynamics Of The Bottom Sediments Granulometric Composition In The Balaklava Bay Affected By The Wind Wunclassified

“…Для второй серии численных экспериментов использовалась комбинация из трех фракций, пространственное распределение которых основано на результатах мониторинговых наблюдений Морского гидрофизического института, выполненных в 2005, 2015, 2018 гг. [4][5][6][7]22]. Гранулометрический состав донных осадков задавался в виде смеси из трех компонентов (мелкий гравий и крупнозернистый песок, среднезернистый песок, мелкозернистый песок), распределенных с различным соотношением объемных концентраций на разных участках исследуемой акватории.…”

Section: Mathematical Modeling the Dynamics Of The Bottom Sediments Granulometric Composition In The Balaklava Bay Affected By The Wind Wunclassified

Mathematical Modeling the Dynamics of the Bottom Sediments Granulometric Composition in the Balaklava Bay Affected by the Wind Waves

Gurov¹,

Фомін²

2021

MGZh

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Purpose. Based on the mathematical modeling methods, influence of the wind waves on redistribution of the sand fractions in the semi-closed estuary-type water area is estimated using the Balaklava Bay as an example. Methods and Results. A two-dimensional version of the XBeach model with a constant grid spacing 10 m was used. The characteristics of wind waves were preset using the JONSWAP spectrum implying fixed height, wave period and various combinations of the wave direction. The calculations were carried out for a storm event lasting about 12 hours once a year. The in-situ data on the particle size distribution in the bottom sediments resulted from the monitoring observations performed by the Marine Hydrophysical Institute, Russian Academy of Sciences, in the Balaklava Bay region was used in the numerical experiments. Conclusions. The results of modeling showed that the basic determining factors regulating the sediments movement were the depth and the bottom slope. It is noted that changing of the bottom inclination angle between the isobaths 6–7 and 7–8 m leads to deposition of the large and medium fractions, and in the area between the isobaths 9–10 and 10–12 m – to accumulation of fine sand. It was revealed that in the Balaklava Bay water area, the main redistribution of sand material caused by the storm waves took place within the southern basin, as well as at the bay exit in the coastal zone of the Megalo-Yalo Bay. This is primarily determined by the features of the Balaklava Bay coast orography, namely, the knee-shaped narrowness separating the northern and southern basins. Nevertheless, in the isolated northern part of the Balaklava Bay being affected by the storm waves, insignificant dynamics of sand material was observed. The fractions of bottom sediments are redistributed from the western coast to the central part of the basin and to the eastern coast of the bay.

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“…The first modern information related to the physical and chemical properties of bottom sediments, composition and quantitative characteristics of macrozoobenthos [3]. At present, much attention is paid to the pollution of the bay bottom sediments with organic substances [4,5] and heavy metals [6,7]. In works [5,7] it is noted that the fractional composition in the surface layer of bottom sediments has changed, primarily due to an increase in the proportion of fine-grained material.…”

mentioning

confidence: 99%

Mathematical Modeling the Dynamics of the Bottom Sediments Granulometric Composition in the Balaklava Bay Affected by the Wind Waves

Gurov¹,

Fomin²

2021

PhO

Self Cite

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Purpose. Based on the mathematical modeling methods, influence of the wind waves on redistribution of the sand fractions in the semi-closed estuary-type water area is estimated using the Balaklava Bay as an example. Methods and Results. A two-dimensional version of the XBeach model with a constant grid spacing 10 m was used. The characteristics of wind waves were preset using the JONSWAP spectrum. The calculations were carried out for a storm event lasting about 12 hours once a year. The in-situ data on the particle size distribution in the bottom sediments resulted from the monitoring observations in the Balaklava Bay region was used in the numerical experiments. Conclusions. The results of modeling showed that the basic determining factors regulating the sediments movement were the depth and the bottom slope. It is noted that changing of the bottom inclination angle between the isobaths 6–7 and 7–8 m leads to deposition of the large and medium fractions, and in the area between the isobaths 9–10 and 10–12 m – to accumulation of fine sand. It was revealed that in the Balaklava Bay water area, the main redistribution of sand material caused by the storm waves took place within the southern basin, as well as at the bay exit in the coastal zone of the Megalo-Yalo Gulf. This is primarily determined by the features of the Balaklava Bay coast orography, namely, the knee-shaped narrowness separating the northern and southern basins. Nevertheless, in the isolated northern part of the Balaklava Bay being affected by the storm waves, insignificant dynamics of sand material was observed. The fractions of bottom sediments are redistributed from the western coast to the central part of the basin and to the eastern coast of the bay.

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Organic Matter and Grain-Size Distribution of the Modern Bottom Sediments in the Balaklava Bay (the Black Sea)

Cited by 8 publications

References 5 publications

Pollutants in Bottom Sediments in the Balaklava Bay (the Black Sea)

Pollutants in Bottom Sediments in the Balaklava Bay (the Black Sea)

Mathematical Modeling the Dynamics of the Bottom Sediments Granulometric Composition in the Balaklava Bay Affected by the Wind Waves

Mathematical Modeling the Dynamics of the Bottom Sediments Granulometric Composition in the Balaklava Bay Affected by the Wind Waves

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