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Persistent impact of Fukushima decontamination on soil erosion and suspended sediment

Author

Listed:
  • Feng

    (University of Tsukuba)

  • Yuichi Onda

    (University of Tsukuba)

  • Yoshifumi Wakiyama

    (Fukushima University)

  • Keisuke Taniguchi

    (Tsuyama College)

  • Asahi Hashimoto

    (University of Tsukuba)

  • Yupan Zhang

    (University of Tsukuba)

Abstract

In Fukushima, government-led decontamination reduced radiation risk and recovered 137Cs-contaminated soil, yet its long-term downstream impacts remain unclear. Here we provide the comprehensive decontamination impact assessment from 2013 to 2018 using governmental decontamination data, high-resolution satellite images and concurrent river monitoring results. We find that regional erosion potential intensified during decontamination (2013–2016) but decreased in the subsequent revegetation stage. Compared with 2013, suspended sediment at the 1-year-flood discharge increased by 237.1% in 2016. A mixing model suggests that the gradually increasing sediment from decontaminated regions caused a rapid particulate 137Cs decline, whereas no significant changes in downstream discharge-normalized 137Cs flux were observed after decontamination. Our findings demonstrate that upstream decontamination caused persistently excessive suspended sediment loads downstream, though with reduced 137Cs concentration, and that rapid vegetation recovery can shorten the duration of such unsustainable impacts. Future upstream remediation should thus consider pre-assessing local natural restoration and preparing appropriate revegetation measures in remediated regions for downstream sustainability.

Suggested Citation

  • Feng & Yuichi Onda & Yoshifumi Wakiyama & Keisuke Taniguchi & Asahi Hashimoto & Yupan Zhang, 2022. "Persistent impact of Fukushima decontamination on soil erosion and suspended sediment," Nature Sustainability, Nature, vol. 5(10), pages 879-889, October.
    • Handle: RePEc:nat:natsus:v:5:y:2022:i:10:d:10.1038_s41893-022-00924-6
    DOI: 10.1038/s41893-022-00924-6
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    References listed on IDEAS

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    1. Xingli Giam & Julian D. Olden & Daniel Simberloff, 2018. "Impact of coal mining on stream biodiversity in the US and its regulatory implications," Nature Sustainability, Nature, vol. 1(4), pages 176-183, April.
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