The effects of sediment transport on temporal variation in radiocesium concentrations in very shallow water off the southern coast of Fukushima, Japan

Publication date: April 2018
Source:Journal of Environmental Radioactivity, Volumes 184–185
Author(s): Akira Matsumoto, Hiroshi Myouse, Hisayuki Arakawa, Ken Higuchi, Naoto Hirakawa, Yoshiaki Morioka, Takuji Mizuno
We studied the very shallow coastal water off Iwaki City, Fukushima Prefecture, and investigated: (1) temporal variation in ¹³⁷Cs concentrations; (2) particle-size distribution of sediments; and (3) the effect on variation by waves, component-fractionated concentration of radiocesium and mineral composition at three sampling stations (Yotsukura, Ena rocky reef and Ena sandy station). There was a decline in ¹³⁷Cs concentrations in sediment samples at all sampling stations between 425 and 1173 days after the accident. All stations had fluctuations in ¹³⁷Cs concentrations between 425 and 800 days. At Ena sandy station and Ena rocky reef stations the declines in ¹³⁷Cs concentrations slowed from about 800 days after the accident. Fluctuations in particle median diameters were seen, as well as in ¹³⁷Cs concentrations. At Yotsukura, where the fluctuation in median diameter was small, a constant decrease in ¹³⁷Cs concentrations was observed. We considered that bioturbation may contribute the constant decrease. At Ena sandy station, where the fluctuation of the median diameter was large, the fluctuation in ¹³⁷Cs concentrations was also large. The movement of sediments was evaluated by the Shields parameter, and results indicated that at any station where the sediment was moved more frequently, the fluctuation in ¹³⁷Cs concentrations was also large. The highly contaminated small particles moved from our stations due to wave action between 425 and 800 days after the accident. The remaining relatively large particles might contribute to the slowing down in reduction of ¹³⁷Cs concentrations from 800 days after the accident. However, the ¹³⁷Cs concentrations in sediments in very shallow water off the southern coast of Fukushima may continue to decline over time.



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