Distribution of 137Cs and 40K in the Bottom Sediments of the Balaklava Bay (the Black Sea)

IF 0.7 Q4 OCEANOGRAPHY
D. Kremenchutskii, K. Gurov
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引用次数: 1

Abstract

Purpose. The aim of the work is to study spatial variability of the 137Cs and 40K concentrations in the bottom sediments of the Balaklava Bay, and to estimate the sedimentation rate and relative content of the biogenic fraction. Methods and Results. The results of the 137Cs and 40K concentration measurements in 5 columns of the bottom sediments sampled in various parts of the Balaklava Bay are represented. Activity of 137Cs and 40K in the samples was determined by the gamma spectrometric analysis. Based on the measurement data, spatial variability of the 137Cs and 40K concentration fields in the bottom sediments was studied, and the sedimentation rate was quantitatively estimated. Application of the balance equation provided quantitative estimates of the relative biogenic fraction content; its spatial variability was described. Quantitative estimates of the relationship between the biogenic fraction estimates resulted from use of the direct and indirect methods are represented. Conclusions. According to the obtained results, the 137Cs and 40K concentrations in the upper 5 cm layer of bottom sediments varied in space from 11 to 62 and from 155 to 562 Bq/kg, respectively. The maximum radionuclide concentrations were characteristic of the northern part of the bay, the minimum ones – of its southern part. The sedimentation average rate was 0.51 ± 0.06 cm/year. Relative biogenic fraction content in the sediments varied in space from 30 to 89% and averaged 46 ± 25%. The maximum values were observed in the southern part of the bay, the minimum ones – in the northern part.
黑海巴拉克拉瓦湾海底沉积物中137Cs和40K的分布
目的。本研究旨在研究巴拉克拉瓦湾底部沉积物中137Cs和40K浓度的空间变异性,并估算沉积速率和生物成因组分的相对含量。方法与结果。本文介绍了在巴拉克拉瓦湾不同地区取样的5个底沉积物柱中137Cs和40K浓度的测量结果。样品中137Cs和40K的活性通过伽马能谱分析测定。基于实测数据,研究了海底沉积物中137Cs和40K浓度场的空间变异性,并定量估算了沉积速率。平衡方程的应用提供了相对生物组分含量的定量估计;描述了其空间变异性。对直接法和间接法估算的生物成因分数之间的关系进行了定量估计。结论。结果表明,沉积物上层5 cm层137Cs和40K浓度空间变化范围分别为11 ~ 62 Bq/kg和155 ~ 562 Bq/kg。放射性核素浓度最高的是海湾北部,最低的是海湾南部。平均沉降速率为0.51±0.06 cm/年。沉积物中相对生物组分含量空间变化范围为30 ~ 89%,平均为46±25%。最大值在海湾南部,最小值在海湾北部。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Physical Oceanography
Physical Oceanography OCEANOGRAPHY-
CiteScore
1.80
自引率
25.00%
发文量
8
审稿时长
24 weeks
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