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タイトル福島周辺海域における表層堆積物中の137Cs濃度の長期変化をもたらす過程
翻訳タイトルProcesses affecting long-term changes in 137Cs concentration in surface sediments off Fukushima
情報提供機関日本海洋学会
著者乙坂 重嘉
掲載日2017-10
言語eng
ページ数559p.-570p.
種別report
内容記述Based on monitoring data from 71 stations off the coast of Fukushima, Miyagi and Ibaraki Prefectures, changing tendencies of 137Cs concentration in surface (0-10 cm) sediment are analyzed, and primary processes affecting the temporal changes are determined. In the coastal region (water depth < 100m), between 2011 and 2015, concentrations of 137Cs in the surface sediment decreased at the rate of 27% per year in average. Such a remarkable temporal change in the 137Cs concentration of sedimentary radiocesium was not observed in the offshore regions. By applying observed data of vertical distribution of sedimentary 137Cs into a pulse input sediment mixing model, it was estimated that more than a half of the decreasing effect was explained by vertical mixing of 137Cs-bound surface sediment with less-contaminated sediment in the deeper layers.
情報源JOPSS関連URL関連URL
URIhttps://f-archive.jaea.go.jp/dspace/handle/faa/211363