DISPERSAL OF LAND-DERIVED SUSPENDED RADIONUCLIDES IN THE FUKUSHIMA COAST
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- YAMANISHI Takafumi
- Kobe University
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- UCHIYAMA Yusuke
- Kobe University
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- TSUMUNE Daisuke
- Central Research Institute of Electric Power Industry
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- MISUMI Kazuhiro
- Central Research Institute of Electric Power Industry
Bibliographic Information
- Other Title
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- 統合型河川・浅海域土砂輸送モデルを用いた河川由来懸濁態放射性核種の海洋分散解析
- トウゴウガタ カセン ・ センカイイキ ドシャ ユソウ モデル オ モチイタ カセン ユライ 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 カイセキ
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Description
Misumi et al. (2014) estimated suspended 137Cs concentration in the seabed by a mathematical model considering static adsorption and desorption of 137Cs between the seawater and the bed sediments. How-ever, the inferred bed 137Cs is substantially underestimated in the offshore area at depth deeper than 200 m. They attributed the reason of this discrepancy to nearshore-originated seaward sediment transport that is omitted in their model. Our model results reveal that although the land-derived or nearshore clay-class sediments reach the deeper area, the time-integrated deposition is only about 2.0×10-3 kg/m2 that is con-sidered to be a minor fraction. It is suggested that debris of organic matters and biogenic opal rather than land-derived minerals likely cause the offshore 137Cs deposition. We further examine nearshore dispersal patterns and quantify the 137Cs inventory in the land-derived sediments though the rivers.
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) 71 (2), I_565-I_570, 2015
Japan Society of Civil Engineers