Share:


Effects of thermodynamical processes on radiocesium behavior in lake tapeliai

Abstract

The article presents the results of the integrated study of radiocesium behavior in Lake Tapeliai using not only conventional data on radiocesium activity concentrations in lake water and sediments but also a complex data set on seasonal variations and vertical profiles of standard water variables. Radiocesium activity concentrations in lake water as well as the vertical structure of the water column considerably depend on the inflows of the colored waters from the swampy watershed of the lake enriched in radiocesium. The global fallouts are mainly responsible for radiocesium inventory in lake sediments, which reaches maximum in the upper part of the water column above the ~5.4-m depth. The maximum values of radiocesium inventories in lake sediments are consistent with the respective densities of its deposits in the nearest forest soils. The main process of sediment activation is the direct sorption of radiocesium onto the sediment surface. Sedimentation rates in the lake vary mainly in the range of 3.5–5 mm·a–1. Lake bottom feeding sources located mainly on the southern terrace as well as their related near-bottom flows reduce respective sedimentation and radiocesium inventories in the sediments.


Article in Lithuanian.


Termodinaminių procesų įtaka radiocezio elgsenai tapelių ežere


Santrauka. Straipsnyje nagrinėjama radiocezio elgsena Tapelių ežere, naudojant ne tik radiocezio savitojo ir tūrinio aktyvumų duomenis, bet ir standartinius vertikaliuosius parametrus, tokius kaip temperatūra, elektros laidumai ir oksiduoto sluoksnio storis. Radiocezio aktyvumas ežero vandenyje priklauso nuo spalvoto pelkinio vandens, kuriame yra radiocezio, patekimo į ežerą. Radiocezio apkrova dugno nuosėdose yra didžiausia viršutinėje ežero dalyje, t. y. iki 5,4 m gylio. Sedimentacijos greitis svyruoja 3,5–5 mm·m–1. Ežero priedugniniai vandens šaltiniai daugiausia išsidėstę pietinėje ežero terasoje, jų srovės sumažina sedimentaciją ir radiocezio apkrovą dugno nuosėdose.


Raktiniai žodžiai: dugno nuosėdos, ežeras, radiocezis, radiocezio apkrova.

Keyword : sediments, lake, radiocesium, radiocesium inventory

How to Cite
Moisejenkova, A., Girgždys, A., & Tarasiuk, N. (2012). Effects of thermodynamical processes on radiocesium behavior in lake tapeliai. Mokslas – Lietuvos Ateitis / Science – Future of Lithuania, 3(6), 95-100. https://doi.org/10.3846/mla.2011.121
Published in Issue
Jan 3, 2012
Abstract Views
252
PDF Downloads
176
Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.