COASTAL DISPERSAL OF RIVER-DERIVED SUSPENDED RADIONUCLIDES DUE TO A FLOOD EVENT AROUND THE MOUTH OF NIIDA RIVER, FUKUSHIMA
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- YAMANISHI Takafumi
- 中日本高速道路株式会社
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- UCHIYAMA Yusuke
- 神戸大学大学院工学研究科市民工学専攻
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- IWASAKI Toshiki
- (国研)寒地土木研究所寒地水圏研究グループ
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- SHIMIZU Yasuyuki
- 北海道大学大学院工学研究院
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- TSUMUNE Daisuke
- (一財)電力中央研究所環境科学研究所
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- MISUMI Kazuhiro
- (一財)電力中央研究所環境科学研究所
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- ONDA Yuichi
- 筑波大学アイソトープ環境動態研究センター
Bibliographic Information
- Other Title
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- 出水イベントに伴う福島新田川河口周辺海域における懸濁態放射性核種の海洋分散について
- シュッスイ イベント ニ トモナウ フクシマ シン タガワ カコウ シュウヘン カイイキ ニ オケル ケンダクタイ ホウシャセイカクシュ ノ カイヨウ ブンサン ニ ツイテ
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Description
We examine oceanic dispersal of the iRIC-Nays2DH-evaluated sediment and suspended 137Cs influxes from Niida River, Fukushima, with a particular attention to the first flood event in late May of 2011 after the Fukushima nuclear accident. Alongshore suspended 137Cs transport occurs assymetrically, comprising storm-driven southward transport confined in the shallow area due to shoreward Ekman transport associated with strong northerly wind, followed by northwestward widespread transport under mild southerly wind condition. About 70 % of the Niida River-derived suspended 137Cs remains near the mouth for 20 days after the flood event. Nevertheless, our model results as well as an observation suggest that the area is dominated by erosion as for high bed shear stress all the time, thus suspended radionuclides are redistributed to dissipate away in long term.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72 (2), I_757-I_762, 2016
Japan Society of Civil Engineers