EGU2020-13965, updated on 20 Jan 2021
https://doi.org/10.5194/egusphere-egu2020-13965
EGU General Assembly 2020
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Effect of decontamination on sediment discharge from mountain stream to river and cesium transfer in Yamakiya district

Fumiaki Makino, Yuichi Onda, Keisuke Taniguchi, Mitbaa Slim, Yoshifumi Wakiyama, Syohei Kozuka, Hiroaki Kato, and Sho Iwagami
Fumiaki Makino et al.
  • Center for research in isotopes and environmental dynamics, University of Tsukuba, Tsukuba, Japan (happyhippy59@ezweb.ne.jp)

After the accident of the Fukushima nuclear power plant, decontamination works had been conducted from 2013 to 2017 in the area of heavly contamination by fallout radionuclides. Although decontamination is conductive to decrease the air dose rate, associated disturbances of soil, such as scraping, reversal tillage, and soil dressing. These decontamination works, in turn, could increase the sediment discharge to downstream, but no studies are available on the effect of the decontamination in upstream headwaters that affects sediment discharge in rivers. Furthermore, decontamination has been carried out in the target area, the Yamakiya area, from 2013, and decontamination has been completed in the spring of 2016, decontamination work has been completed in 2017, and the residents have been returned. The sediment runoff due to human activities can be different from the sediment runoff due to decontamination.

The purpose of this study was to study the relationship between sediment dynamics and Cs dynamics due to decontamination, and the changes in sediment dynamics due to the return of residents. Observations and historical data were analyzed at Iboishi mountain in the forest and the middle stream of Kuchibuto. We have been monitoring suspended sediment Cs-137 concentration, water runoff, and suspended sediment runoff since 2014 at the middle point of the Kuchibuto River and since 2013 at Mt.Iboishi. The slope of the approximation line was compared with the LQ curve for comparison of the amount of sediment runoff. In the middle of the Kuchibuto river, it was 1.54 in 2014, 2.28 in 2015, 2.12 in 2016, 0.164 in 2017, and 0.189 in 2018. At Iboishi mountain in the forest, it was 1.72 in 2014, 0.947 in 2015, 1.39 in 2016, 0.219 in 2017, and 1.15 in 2018. The same tendency was shown in the slopes of the LQ curves in the middle part of the Kuchibuto river and the Iboishi mountain in the forest area. The Cs concentration was high until November 2015, but since then, the Cs concentration has decreased. These results suggest that the increased sediment discharge due to decontamination of the forest area affected the sediment discharge in the middle stream of the Kuchibuto River.

How to cite: Makino, F., Onda, Y., Taniguchi, K., Slim, M., Wakiyama, Y., Kozuka, S., Kato, H., and Iwagami, S.: Effect of decontamination on sediment discharge from mountain stream to river and cesium transfer in Yamakiya district, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-13965, https://doi.org/10.5194/egusphere-egu2020-13965, 2020

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  • CC1: Comment on EGU2020-13965, Olivier Evrard, 08 May 2020

    Thanks for sharing a very interesting display presentation! I wondered what type of decontamination was conducted in these watersheds; was the 5-cm topsoil layer removed and then replaced with crushed granite (as in neighbouring areas)? Thanks for your feedback!

    Kind regards, Olivier Evrard

    • AC1: Reply to CC1, Fumiaki Makino, 08 May 2020

      Thank you for your comment.

      You're right.In the farmland, 5 cm of surface soil was removed and granite was laid on it. In forest areas, remove litter from the forest floor and cut twigs. In a residential area, wipe the roof and remove soil from the garden.

      Fumiaki Makino

      • CC2: Reply to AC1, Olivier Evrard, 08 May 2020

        Thanks for your feedback! Did you consider testing some sediment tracing techniques to identify the occurrence of changes in sediment sources with time in these catchments? Kind regards, Olivier

        • AC2: Reply to CC2, Fumiaki Makino, 15 May 2020

          Sorry for the late reply. No, I haven't tried. Best regards.

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