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Analysis of ground deposition of radionuclides under different wind fields from the Fukushima Daiichi accident

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Abstract

The relationship between ground deposition of radionuclides and wind fields from the Fukushima Daiichi accident was investigated using the weather research and forecasting/chemistry model with the improvements by adding the radioactive decay process, dry and wet deposition parameterizations. To examine this correlation, wind fields near Fukushima Daiichi nuclear power plant (FDNPP) were defined as four different types mainly based on the wind direction, and the contaminated land areas were classified to five levels. The results showed that the distribution of the ground deposition of the radionuclides is mainly determined by the wind field rather than the precipitation distribution; Northeast wind has the largest contaminated land areas, and it is considered to much more easily accelerate the transport of radionuclides than any other wind direction near the FDNPP. It was also indicated by the results that in terms of high contaminated land area (>100 Bq/m2), total ground deposition is dominated by dry deposition for 131I, and by wet deposition for 137Cs.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (Grant No. 2016YFC0802801). The authors also express their gratitude to the anonymous reviewers for their insightful comments and for the precious advice given to improve this paper.

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Correspondence to Jiansong Wu.

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Wu, J., Hu, X., Ma, J. et al. Analysis of ground deposition of radionuclides under different wind fields from the Fukushima Daiichi accident. Nat Hazards 87, 533–544 (2017). https://doi.org/10.1007/s11069-017-2777-7

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  • DOI: https://doi.org/10.1007/s11069-017-2777-7

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