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Ikenoue, Tsubasa; Nakanishi, Takahiro; Shimadera, Hikari*; Kawamura, Hideyuki; Kondo, Akira*
E3S Web of Conferences (Internet), 530, p.02005_1 - 02005_10, 2024/05
The accident at the Fukushima Daiichi Nuclear Power Plant (FDNPP) caused a radioactive contamination in seabed sediment. The Cs supply from rivers could be an important process for the long-term behavior of
Cs in seabed sediment. In this study, a ten-year simulation of the
Cs behavior in seabed sediment was conducted using an oceanic dispersion model combined with a prediction model of
Cs behavior in land and river. In the waters north of FDNPP, the simulation results suggested that the
Cs supply from rivers had a great impact on the concentrations in coastal sediment due to the initial low concentrations in seabed sediment and the large supply of
Cs from rivers. In the waters near FDNPP and south of FDNPP, the simulation results suggested that the impact of the
Cs supply on the temporal variation of
Cs concentration in coastal sediment was relatively small due to the large initial adsorption from seawater. Overall, these results indicated that
Cs supply from rivers had an impact on the spatiotemporal distribution of
Cs concentrations in seabed sediment on a decadal time scale and the impact was especially great in the waters north of FDNPP.