著者

内山 雄介 石井 倫生 津旨 大輔 宮澤 泰正

出版者

公益社団法人 土木学会

雑誌

土木学会論文集B2(海岸工学) (ISSN:18842399)

巻号頁・発行日

vol.68, no.2, pp.I_931-I_935, 2012 (Released:2012-11-15)

参考文献数

6

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The 2011 Tohoku earthquake and the associated tsunami caused a severe nuclear accident at the Fukushima Daiichi Nuclear Power Plant (1F), leading to radioactive water leaking into the sea. We conduct a triple nested high-resolution numerical hindcast to assess oceanic dispersion of the leaked cesium-137 (137Cs) in the coastal marginal sea, and successfully reproduce fluctuations of 137Cs concentration. While an alongshore 137Cs concentration PDF indicates a prevailing northward transport, a 137Cs flux budget analysis exhibits that the cumulative alongshore flux is much greater than the offshore flux with latitudinal asymmetry due to the eddy transport, suggesting that 137Cs tend to remain in the coastal zone.