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A Modeling approach to estimate $$^{3}$$H discharge from rivers; Comparison of discharge from the Fukushima Dai-ichi and inventory in seawater in the Fukushima coastal region

Sakuma, Kazuyuki  ; Machida, Masahiko ; Kurikami, Hiroshi ; Iwata, Ayako; Yamada, Susumu ; Iijima, Kazuki 

Estimation of $$^{3}$$H discharge from river catchments is important to evaluate the effect of Fukushima Dai-ichi discharge and future planned $$^{3}$$H release to the ocean on the coastal environment. Using a previously developed model based on the tank model and observed $$^{3}$$H concentration in river water, the $$^{3}$$H discharge from the Abukuma River and 13 other rivers in the Fukushima coastal region were estimated from June 2013 to March 2020. The annual $$^{3}$$H discharge from catchments of the Abukuma River and 13 other rivers in the Fukushima coastal region during 2014-2019 were estimated to be 1.2-4.0 TBq/y. These values were approximately 2-22 times larger than the annual $$^{3}$$H discharge from the Fukushima Dai-ichi after 2016, indicating the significance of naturally derived $$^{3}$$H discharge from the catchments through the rivers. This estimation is expected to be useful to evaluate and predict $$^{3}$$H concentrations and inventories in the Fukushima coastal region for consideration of planned $$^{3}$$H release to the ocean.

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