The contribution of 137Cs export flux from the Tone River Japan to the marine environment

[Display omitted] •River 137Cs contribution to the ocean for 2014–15 after FDNPP accident was estimated.•Targeted Tone River has 190–280 TBq of 137Cs in catchment.•Annual riverine 137Cs flux was 78–107 GBq during 2014–2015.•Tone River 137Cs flux was comparable with that for rivers in the vicinity of...

Full description

Saved in:
Bibliographic Details
Published in:The Science of the total environment 2020-01, Vol.701, p.134550-134550, Article 134550
Main Authors: Takata, Hyoe, Inatomi, Naohiko, Kudo, Natsumi
Format: Article
Language:English
Subjects:
Dissolved phase
Particles
Particulate phase
Riverine flux
Water regime
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] •River 137Cs contribution to the ocean for 2014–15 after FDNPP accident was estimated.•Targeted Tone River has 190–280 TBq of 137Cs in catchment.•Annual riverine 137Cs flux was 78–107 GBq during 2014–2015.•Tone River 137Cs flux was comparable with that for rivers in the vicinity of FDNPP.•Input was ~10% of the continuous direct effluent from FDNPP during 2014–2015. The contribution of 137Cs transport to the marine environment via the Tone River, Japan was investigated. This river has the largest discharge among rivers on the North Pacific side of eastern Japan. The sampling site was located upstream near the river mouth and dissolved and particulate 137Cs in the river water was measured during 2014–2015, three years after the Tokyo Electric Power Corporation Fukushima Daiichi Nuclear Power Plant (FDNPP) accident. Annual fluxes of total (dissolved and particulate) 137Cs with considering desorption of 137Cs from riverine particles by change of salinity from the Tone River were similar in both years (78–107 × 109 Bq/y), indicating that about 0.03–0.06% of the estimated total amount of 137Cs deposited in the catchment (1.9–2.8 × 1014 Bq) was transported to the marine environment each year. Although the annual flux was about one order of magnitude lower than the daily direct discharge into the ocean from the FDNPP (800 × 109 Bq/y) during the corresponding period, continuous monitoring of rivers in the southern coastal area of east Japan on the North Pacific side are needed for the effect of 137Cs release via the rivers in the Kanto area over the long-term.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2019.134550