検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

Radiocaesium distribution in a Fukushima river estuary

福島県内の河口域における放射性セシウムの分布状況

萩原 大樹  ; 小西 博巳*; 中西 貴宏   ; 原田 久也; 鶴田 忠彦  

Hagiwara, Hiroki; Konishi, Hiromi*; Nakanishi, Takahiro; Harada, Hisaya; Tsuruta, Tadahiko

On fluvial discharge, particulate fractions are the main carrier of radiocaesium from land to aquatic bodies such as rivers, lakes and the sea. However, within river estuaries, where there is a drastic increase in salinity, fine particles generally flocculate (in the size order of several tens $$mu$$m) before settling out and being deposited on the river bed. In this study, we investigated the sediment records and the distribution of radiocaesium within the estuary of the Odaka river in January 2014. Based on distribution of salinity, the environment of the Odaka river is divided into three areas; the freshwater area, the estuarine marine area and the brackish area between these two. Radiocaesium deposition ranged from 45 to 1070 kBq m$$^{-2}$$ with the inventory of radiocaesium in the estuary being significantly greater in the brackish area relative to both the freshwater and estuarine marineareas. Particle size dependency of radiocaesium concentration in the sediments showed that the distribution with relatively higher concentration was expected in the brackish area. The possibility of flocculation in the brackish area will be discussed.

Access

:

- Accesses

InCites™

:

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.