Physical Oceanography Physical Oceanography 1573-160X 20230508 Experimental and field research Research Article Factors Forming the Spatial Distribution of Natural and Man-Made Radionuclides in the Bottom Sediments of the Kamyshovaya Bay, Sevastopol https://orcid.org/0000-0002-8747-6612 AAC-1673-2020 Kremenchutskii D. A.
Russian Federation
d.kremenchutskii@mhi-ras.ru https://orcid.org/0000-0002-9826-4789 AAB-5628-2019 Gurova Yu. S.
Russian Federation
kurinnaya-jul@yandex.ru Marine Hydrophysical Institute of RAS Sevastopol Russian Federation 31 10 2023 30 5 652 665 22 01 2023 18 02 2023 05 07 2023 Copyright ©; 2023, D. A. Kremenchutskii, Yu. S. Gurova 2023 D. A. Kremenchutskii, Yu. S. Gurova https://creativecommons.org/licenses/by-nc/4.0/ https://physical-oceanography.ru/repository/issues/2023/05/08/

Purpose. The purpose of the article is to reveal the features of spatial distribution of the radionuclide ²¹⁰Pbₑₓ, ²²⁶Ra, ¹³⁷Cs and ⁴⁰K contents in the bottom sediments of the Kamyshovaya Bay and to identify the factors determining them.

Methods and Results. The paper presents the results of measurements of the concentrations of ²¹⁰Pbₑₓ, ²²⁶Ra, ¹³⁷Cs and ⁴⁰K in nine samples of the surface (0–5 cm) layer and in two columns of bottom sediments collected in the Kamyshovaya Bay in July 2021. The activity of ²¹⁰Pbₑₓ, ²²⁶Ra, ¹³⁷Cs and ⁴⁰K in the samples was determined using a low-background gamma spectrometer with a well-type NaI(Tl) scintillation detector. Estimates of the relationship between the activity of the radionuclides under consideration in the bottom sediments with the sediment granulometric composition and the organic carbon content are given. The rate of sedimentation and the flux of matter and radionuclides to the bottom sediments were quantitatively assessed.

Conclusions. Spatial variability of the concentrations of radionuclides under consideration reveals a general tendency towards increase of their values from the northern part of the bay to its southern one. The results of the analysis indicate that the spatial variability of radionuclide content in the surface sediment samples and their vertical distribution in the two columns are explained by the changes in particle size distribution and in sedimentation rates, as well as by presence of the storm water and domestic wastewater sources in the bay southern part. Based on the results of the correlation analysis, the process of water purification in the area under study was assumed to result from the adsorption of radionuclides and organic matter by a fine-grained material that was followed by sedimentation of this material in bottom sediments. The average values of the sedimentation rate and the matter flux to bottom sediments were 0.43 cm/year and 2976 g/(m²·year), respectively. The flux of radionuclides to the bottom sediments was 53.0 Bq/(m²·year) for ¹³⁷Cs, 690.5 Bq/(m²·year) for ⁴⁰K, 58.0 Bq/(m²·year) for ²²⁶Ra and 79.5 Bq/(m²·year) for ²¹⁰Pbₑₓ.

 Black Sea Kamyshovaya Bay bottom sediments particle size distribution organic carbon cesium-137 ¹³⁷Cs potassium-40 ⁴⁰K radium-226 ²²⁶Ra lead-210 ²¹⁰Pb sedimentation rate radionuclides sedimentation The bottom sediment samples and the data on their geochemical characteristics were obtained within the framework of state assignment of FSBSI FRC MHI No. FNNN-2021-0005. The data on radionuclide activity were obtained within the framework of the theme of state assignment of FSBSI FRC MHI No. FNNN-2021-0004. Quantitative estimates of the sedimentation rate and substance fluxes to the bottom sediments were obtained within the framework of the RSF project No. 22-77-10056.

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REFERENCES KuftarkovaE. A. RodionovaN. Yu. GubanovV. I. BobkoN. I. Hydrochemical Characteristics of Several Bays of Sevastopol Coast YugNIRO Proceedings 2008 46 110 117 (in Russian) MironovO. G. AlemovS. V. ShchekaturinaT. L. OsadchayaT. S. SolovevaO. V. BurdiyanN. V. TikhonovaE. A. MironovO. A. DoroshenkoYu. V. Sanitary and Biological Studies of the South-Western Crimea Coastal Waters at the Beginning of XXI Century Simferopol IT "ARIAL" 2018 276 10.21072/978-5-907118-89-8 (in Russian) MironovO. G. KirjukhinaL. N. AlyomovS. V. Sanitary-Biological Aspects of the Sevastopol Bays Ecology in XX Century Sevastopol ECOSI-Gidrofizika 2003 185 (in Russian) SolovevaO. V. TikhonovaE. A. The Organic Matter Content Dynamics in the Sea Bottom Sediments of the Sevastopol Harbor Water Area Scientific Notes of V.I. Vernadsky Crimean Federal University. Biology. Chemistry 2018 4 70 196 206 (in Russian) KurinnayaYu. S. GurovK. I. ZabegaevI. A. OrekhovaN. A. Redox Conditions and Characteristics of Bottom Sediments in the Bays of the Sevastopol Region Ecological Safety of Coastal and Shelf Zones of Sea 2022 1 42 54 10.22449/2413-5577-2022-1-42-54 MirzoevaN. Yu. GulinS. B. MiroshnichenkoO. N. Strontium and Cesium Radionuclides LisitzinA. P. The Black Sea System Moscow Scientific World 2018 605 624 10.29006/978-5-91522-473-4.2018.605 (in Russian) FuhrmannM. PietrzakR. NeiheiselJ. DyerR. Partitioning of Cs-137 between Sediment and Water from the Black Sea Chemistry and Ecology 1992 7 1-4 3 17 10.1080/02757549208055429 BuesselerK. O. LivingstonH. D. Time-Series Profiles of ¹³⁴Cs, ¹³⁷Cs and ⁹⁰Sr in the Black Sea OzsoyE. MikaelyanA. Sensitivity to Change: Black Sea, Baltic Sea and North Sea Dordrecht Springer 1997 27 239 251 10.1007/978-94-011-5758-2_19 PolikarpovG. G. EgorovV. N. GulinS. B. StokozovN. A. LazorenkoG. E. MirzoevaN. Yu. TereshchenkoN. N. TsytsuginaV. G. KulebakinaL. G. Radiocological Response of the Black Sea to the Chernobyl Accident Sevastopol ECOSI-Gidrofizika 2008 666 (in Russian) DelfantiR. OzsoyE. KaberiH. SchironeA. SalviS. ConteF. TsabarisC. PapucciC. Evolution and Fluxes of ¹³⁷Cs in the Black Sea/Turkish Straits System/North Aegean Sea Journal of Marine Systems 2014 135 117 123 10.1016/j.jmarsys.2013.01.006 ChiroscaG. MihailovM. E. TugulanL. C. ChiroscaA. V. Radionuclides Assessment for the Romanian Black Sea Shelf FinklC. MakowskiC. Diversity in Coastal Marine Sciences Cham Springer 2018 23 221 232 10.1007/978-3-319-57577-3_13 MirzoevaN. Y. GulinS. B. SidorovI. G. GulinaL. V. Estimation of Sedimentation and Sedimentation Rates in the Coastal and Deep-Water Areas of the Black Sea Using Natural and Anthropogenic (Chernobyl) Radionuclides LisitzinA. P. The Black Sea System Moscow Scientific World 2018 659 670 10.29006/978-5-91522-473-4.2018 (in Russian) DovhyiI. I. KremenchutskiiD. A. BezhinN. A. KozlovskaiaO. N. MilyutinV. V. KozlitinE. A. Distribution of ¹³⁷Cs in the Surface Layer of the Black Sea in Summer, 2017 Physical Oceanography 2020 27 2 152 160 10.22449/1573-160X-2020-2-152-160 DrexlerJ. Z. FullerC. C. ArchfieldS. The Approaching Obsolescence of ¹³⁷Cs Dating of Wetland Soils in North America Quaternary Science Reviews 2018 199 83 96 10.1016/j.quascirev.2018.08.028 EvrardO. ChabocheP.-A. RamonR. FoucherA. LacebyJ. P. A Global Review of Sediment Source Fingerprinting Research Incorporating Fallout Radiocesium ¹³⁷Cs Geomorphology 2020 362 107103 10.1016/j.geomorph.2020.107103 GulinS. B. SidorovI. G. GulinaL. V. Biogenic Sedimentation in the Black Sea: Radiotracer-Derived Study Marine Ecological Journal 2013 12 2 19 25 (in Russian) GulinS. B. GulinaL. V. SidorovI. G. ProskurninV. Yu. DukaM. S. MoseichenkoI. N. RodinaE. A. ⁴⁰K in the Black Sea: A Proxy to Estimate Biogenic Sedimentation Journal of Environmental Radioactivity 2014 134 21 26 10.1016/j.jenvrad.2014.02.011 RusakovV. Yu. BorisovA. P. SolovievaG. Yu. Sedimentation Rates in Different Facies-Genetic Types of Bottom Sediments in the Kara Sea: Evidence from the ²¹⁰Pb and ¹³⁷Cs Radionuclides Geochemistry International 2019 57 11 1185 1200 10.1134/S0016702919110077 KremenchutskiiD. A. GurovK. I. Assessment of Sedimentation Rate in the Balaklava Bay by Radionuclides 20th International Multidisciplinary Scientific GeoConference SGEM 2020 2020 20 1.1 65 72 AbrilJ. M. On the Use of ²¹⁰Pb-Based Records of Sedimentation Rates and Activity Concentrations for Tracking Past Environmental Changes Journal of Environmental Radioactivity 2022 244-245 106823 10.1016/j.jenvrad.2022.106823 SchironeA. RozmaricM. BarsantiM. RaiteriG. Sanchez-CabezaJ. A. Garcia-TenorioR. OsvathI. Assessment of Measurement Accuracy in ²¹⁰Pb Dating Sediment Methods Quaternary Geochronology 2022 69 101255 10.1016/j.quageo.2022.101255 KremenchutskiiD. A. GurovK. I. Distribution of ¹³⁷Cs and ⁴⁰K in the Bottom Sediments of the Balaklava Bay (the Black Sea) Physical Oceanography 2021 28 2 191 204 10.22449/1573-160X-2021-2-191-204 RobbinsJ. A. EdgingtonD. N. KempA. L. W. Comparative ²¹⁰Pb, ¹³⁷Cs, and Pollen Geochronologies of Sediments from Lakes Ontario and Erie Quaternary Research 1978 10 2 256 278 10.1016/0033-5894(78)90105-9 CurrieL. A. Limits for Qualitative Detection and Quantitative Determination. Application to Radiochemistry Analytical Chemistry 1968 40 3 586 593 10.1021/ac60259a007 OvsyanyE. J. RomanovA. S. Min'kovskayaR. Ya. KrasnovidI. I. OzyumenkoB. A. ZymbalI. M. Basic Polluting Sources of Sea near Sevastopol Ekologicheskaya Bezopasnost' Pribrezhnoi i Shel'fovoy Zon i Kompleksnoe Ispol'zovanie Resursov Shel'fa [Ecological Safety of Coastal and Shelf Zones and Comprehensive Use of Shelf Resources] 2001 2 138 152 (in Russian) EgorovV. N. GulinS. B. MalakhovaL. V. MirzoyevaN. Yu. PopovichevV. N. TereshchenkoN. N. LazorenkoG. E. PlotitsynaO. V. MalakhovaT. V. Biogeochemical Characteristics of the Sevastopol Bay Sedimentation Self-Purification from Radionuclides, Mercury and Chlorogenic Contaminants Marine Biological Journal 2018 3 2 40 52 10.21072/mbj.2018.03.2.03 LiY.-H. BurkhardtL. BuchholtzM. O'HaraP. SantschiP. H. Partition of Radiotracers between Suspended Particles and Seawater Geochimica et Cosmochimica Acta 1984 48 10 2011 2019 10.1016/0016-7037(84)90382-X HawleyN. RobbinsJ. A. EadieB. J. The Partitioning of ⁷Beryllium in Fresh Water Geochimica et Cosmochimica Acta 1986 50 6 1127 1131 10.1016/0016-7037(86)90393-5 KremenchutskiiD. A. BatrakovG. F. DovhyiI. I. SapozhnikovY. A. Role of Suspended Matter in Controlling Beryllium-7 (⁷Be) in the Black Sea Surface Layer Journal of Marine Systems 2021 217 103513 10.1016/j.jmarsys.2021.103513 EgorovV. N. GulinS. B. PopovichevV. N. MirzoyevaN. Yu. TereshenkoN. N. LazorenkoG. E. MalakhovaL. V. PlotitsinaO. V. MalakhovaT. V. Biogeochemical Mechanisms of Formation of Critical Zones Concerning to Pollutants in the Black Sea Marine Ecology Journal 2013 12 4 5 26 (in Russian)