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Impact of the 2019 typhoons on sediment source contributions and radiocesium concentrations in rivers draining the Fukushima radioactive plume, Japan

Abstract : The Fukushima nuclear accident in March 2011 generated a 3000 km2 plume of soils heavily contaminated with 137Cs. Decontamination was completed early in 2019. Typhoon Hagibis was the first extreme event that occurred in the region after decontamination. Its impact on sediment sources and sediment 137Cs contamination was investigated through the application of a sediment fingerprinting procedure using spectrocolorimetry and geochemical properties. Sediment deposits (n=24) were collected in the Mano and Niida River catchments after the 2019 typhoons, and their signature was compared to that of potential sources (e.g., cropland, forests, and subsurface; n=57). Results demonstrate the dominance of cropland as the main source of sediment (mean: 54%) followed by forests (41%) with much lower contributions of subsurface material (5%). Overall, 137Cs concentrations in sediment were on average 84%–93% lower than the levels recorded after the accident in 2011, which demonstrates the effectiveness of cropland decontamination.
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https://hal-cea.archives-ouvertes.fr/cea-03079420
Contributor : Olivier Evrard <>
Submitted on : Thursday, December 17, 2020 - 11:14:36 AM
Last modification on : Thursday, May 6, 2021 - 10:53:09 AM
Long-term archiving on: : Thursday, March 18, 2021 - 6:55:56 PM

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Olivier Evrard, Roxanne Durand, Atsushi Nakao, J. Patrick Laceby, Irène Lefèvre, et al.. Impact of the 2019 typhoons on sediment source contributions and radiocesium concentrations in rivers draining the Fukushima radioactive plume, Japan. Comptes Rendus Géoscience, Elsevier Masson, 2020, 352 (3), pp.199-211. ⟨10.5802/crgeos.42⟩. ⟨cea-03079420⟩

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