статья в журнале

En

PHYSICAL OCEANOGRAPHY

ISSN:0928-5105
eSSN:1573-160X

2021

10.22449/1573-160X-2021-2-191-204

Purpose. The aim of the work is to study spatial variability of the Cs-137 and K-40 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 Cs-137 and K-40 concentration measurements in 5 columns of the bottom sediments sampled in various parts of the Balaklava Bay are represented. Activity of Cs-137 and K-40 in the samples was determined by the gamma spectrometric analysis. Based on the measurement data, spatial variability of the Cs-137 and K-40 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 Cs-137 and K-40 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.

LACK SEA, ALAKLAVA BAY, OTTOM SEDIMENTS, ESIUM-137 (137CS), OTASSIUM-40 ( K), 40 SEDIMENTATION RATE, IOGENIC FRACTIO

2021-07-15 11:35:23