Horizontal and vertical distributions of $$^{137}$$Cs in seabed sediments around the river mouth near Fukushima Daiichi Nuclear Power Plant
鶴田 忠彦; 原田 久也*; 御園生 敏治; 松岡 稔幸; 程塚 保行*
Tsuruta, Tadahiko; Harada, Hisaya*; Misono, Toshiharu; Matsuoka, Toshiyuki; Hodotsuka, Yasuyuki*
The seafloor topography was divided into flat and terrace seafloors based on their topographical features and seabed sediments were distributed in an area that was half a degree of the entire investigation area. The $$^{137}$$Cs inventory was several tens of kBq/m$$^{2}$$ and the grain sizes (the D50 values) were nearly constant (fine sand) on the flat seafloor. On the terrace seafloor, the $$^{137}$$Cs inventory was larger than that on the flat seafloor, and the grain size varied from silt to coarse sand. The grain size distributions appear to be influenced by the mean shear stress at the seafloor bottom, and a significant factor in the mean shear stress is thought to be the seafloor topography. Distributions of remarkably large $$^{137}$$Cs inventories, more than several thousands of kBq/m$$^{2}$$, are thought to be confined to a small area. Vertical changes in the $$^{137}$$Cs inventories suggested that the $$^{137}$$Cs inventories have significantly decreased in large areas of the shallow sea.
使用言語 : English
掲載資料名 : Journal of Oceanography
: 73
: 5
ページ数 : p.547 - 558
発行年月 : 2017/10
出版社名 : 日本海洋学会
特許データ :
論文URL :
キーワード : radioactive cesium; seabed sediment; seafloor topography; Fukushima Daiichi Nuclear Power Station Accident; 福島第一原子力発電所事故
使用施設 :
広報プレスリリース :
受委託・共同研究相手機関 :
登録番号 : AA20160496
抄録集掲載番号 : 45001212
論文投稿番号 : 19443
Accesses  (From Jun. 2, 2014)
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