Horizontal and vertical distributions of Cs in seabed sediments around the river mouth near Fukushima Daiichi Nuclear Power Plant

Tsuruta, Tadahiko; Harada, Hisaya*; Misono, Toshiharu; Matsuoka, Toshiyuki; Hodotsuka, Yasuyuki*

Journal of Oceanography, 73(5), p.547 - 558, 2017/10

https://doi.org/10.1007/s10872-017-0439-8

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 Cs inventory was several tens of kBq/m and the grain sizes (the D50 values) were nearly constant (fine sand) on the flat seafloor. On the terrace seafloor, the 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 Cs inventories, more than several thousands of kBq/m, are thought to be confined to a small area. Vertical changes in the Cs inventories suggested that the Cs inventories have significantly decreased in large areas of the shallow sea.

Long-term assessment of transport of radioactive contaminant in the environment of Fukushima (F-TRACE Project), 11; Transport and accumulation behavior of radioactive cesium in coastal area

Tsuruta, Tadahiko; Harada, Hisaya; Misono, Toshiharu; Matsuoka, Toshiyuki

no journal, , 

no abstracts in English

Radiocaesium distribution in a Fukushima river estuary

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

no journal, , 

Characteristic of mineral assemblage of seabed sediments off the Fukushima coast

Tsuruta, Tadahiko; Harada, Hisaya*; Misono, Toshiharu

no journal, , 

no abstracts in English

Distribution, of radiocesium concentration and grain size of sediments in the coastal area of Fukushima Prefecture

Harada, Hisaya; Tsuruta, Tadahiko

no journal, , 

no abstracts in English