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Journal Articles

Impact of extreme typhoon events on the fluvial discharge of particulate radiocesium in Fukushima Prefecture

Nakanishi, Takahiro; Oyama, Takuya; Hagiwara, Hiroki; Sakuma, Kazuyuki

Journal of Coastal Research, 114(SI), p.310 - 314, 2021/10

https://doi.org/10.2112/JCR-SI114-063.1
 Times Cited Count：5 Percentile：42.16(Environmental Sciences)

The two huge typhoons in 2019, Hagibis and Bualoi, caused enormous flood damage to Fukushima. On the basis of field observations over 6 years in Ukedo River near the Fukushima Nuclear Power Plant, sediment and $$^{137}$$Cs discharges from the river catchment were quantitatively evaluated. Approximately 90% of annual sediment and $$^{137}$$Cs discharges in 2019 was occupied during the typhoons Hagibis and Bualoi events. This sediment discharge was almost twice than the discharge during the largest ever flood event since the Fukushima nuclear accident, caused by typhoon Etau in September 2015. However, $$^{137}$$Cs discharge during Hagibis and Bualoi events was two-thirds that of Etau event, because the particulate $$^{137}$$Cs concentration in river water decreased during the observation period. Moreover, $$^{137}$$Cs discharge during two typhoon events in 2019 accounted for only 0.1% of the catchment $$^{137}$$Cs deposition and the impact of radiocesium to the coastal area was extremely limited.

Oral presentation

Transport behavior of radiocesium in the river system during the typhoon Hagibis and torrential rain in October, 2019

Niizato, Tadafumi; Sakuma, Kazuyuki; Iijima, Kazuki; Nakanishi, Takahiro

no journal, , 

no abstracts in English

Oral presentation

Impact of huge typhoon events on behavior of radiocesium in river water

Nakanishi, Takahiro

no journal, , 

This presentation is a summary of the research results that have been obtained in environmental dynamics research conducted by JAEA in Fukushima Prefecture, especially riverine environments. Our result revealed a declining trend for the dissolved and particulate $$^{137}$$Cs concentration in river water after the FDNPP accident. Sediment discharge caused by extreme typhoons Hagibis and Bualoi in 2019 was almost twice that related to the largest ever flood event since the Fukushima nuclear accident, which was caused by the typhoon Etau in September 2015. However, the $$^{137}$$Cs discharge related to the Hagibis and Bualoi events was two-thirds of the Etau event; the particulate $$^{137}$$Cs concentration in river water decreased during the observation period. The air dose rates on the floodplains were gradually decreasing with time, because the radiocesium concentration in surface sediment decreased with the decrease in the radiocesium concentration of suspended particles.

Oral presentation

Impact of typhoon events on the fluvial discharge of particulate radiocesium

Nakanishi, Takahiro

no journal, , 

no abstracts in English

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