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| Titel |
Export of 134 Cs and 137 Cs in the Fukushima river systems at heavy rains by Typhoon Roke in September 2011 |
| VerfasserIn |
S. Nagao, M. Kanamori, S. Ochiai, S. Tomihara, K. Fukushi, M. Yamamoto |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 10 ; Nr. 10, no. 10 (2013-10-02), S.6215-6223 |
| Datensatznummer |
250085346
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| Publikation (Nr.) |
 copernicus.org/bg-10-6215-2013.pdf |
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| Zusammenfassung |
| At stations on the Natsui River and the Same River in Fukushima Prefecture,
Japan, effects of a heavy rain event on radiocesium export were studied
after Typhoon Roke during 21–22 September 2011, six months after the
Fukushima Dai-ichi Nuclear Power Plant accident. Radioactivity of 134Cs
and 137Cs in river waters was 0.009–0.098 Bq L−1 in normal flow
conditions during July–September 2011, but it increased to 0.85 Bq L−1 in
high flow conditions because of heavy rains occurring with the typhoon. The
particulate fractions of 134Cs and 137Cs were 21–56% of total
radiocesium in the normal flow condition, but were close to 100% after
the typhoon. These results indicate that the pulse input of radiocesium
associated with suspended particles from land to coastal ocean occurred
because of the heavy rain event. Export flux of 134Cs and 137Cs
attributable to the heavy rain accounts for 30–50% of the annual
radiocesium flux from inland to coastal ocean region in 2011. Results show
that rain events are one factor contributing to the transport and dispersion
of radiocesium in river watersheds and coastal marine environments. |
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