Impact of changing the wet deposition schemes in ldx on 137-cs atmosperic deposits after the fukushima accident
HARMO 2016 - 17th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, L{\'a}szl{\'o} Boz{\'o}, Zita Ferenci, May 2016, Budapest, Hungary. pp.598-602 The Fukushima-Daiichi release of radioactivity is a relevant event to study the a...
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Main Authors | , , , , , , , , , |
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Format | Journal Article |
Language | English |
Published |
21.08.2024
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Subjects | |
Online Access | Get full text |
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Summary: | HARMO 2016 - 17th International Conference on Harmonisation within
Atmospheric Dispersion Modelling for Regulatory Purposes, L{\'a}szl{\'o}
Boz{\'o}, Zita Ferenci, May 2016, Budapest, Hungary. pp.598-602 The Fukushima-Daiichi release of radioactivity is a relevant event to study
the atmospheric dispersion modelling of radionuclides. Actually, the
atmospheric deposition onto the ground may be studied through the map of
measured Cs-137 established consecutively to the accident. The limits of
detection were low enough to make the measurements possible as far as 250km
from the nuclear power plant. This large scale deposition has been modelled
with the Eulerian model ldX. However, several weeks of emissions in multiple
weather conditions make it a real challenge. Besides, these measurements are
accumulated deposition of Cs-137 over the whole period and do not inform of
deposition mechanisms involved: in-cloud, below-cloud, dry deposition. In a
previous study (Qu{\'e}rel et al., 2016), a comprehensive sensitivity analysis
was performed in order to understand wet deposition mechanisms. It has been
shown that the choice of the wet deposition scheme has a strong impact on
assessment of deposition patterns. Nevertheless, a ``best'' scheme could not be
highlighted as it depends on the selected criteria: the ranking differs
according to the statistical indicators considered (correlation, figure of
merit in space and factor 2). A possibility to explain the difficulty to
discriminate between several schemes was the uncertainties in the modelling,
resulting from the meteorological data for instance. Since the move of the
plume is not properly modelled, the deposition processes are applied with an
inaccurate activity concentration in the air. In the framework of the SAKURA
project, an MRI-IRSN collaboration, new meteorological fields at higher
resolution (Sekiyama et al., 2013) were provided and allow to reconsider the
previous study. An update including these new meteorology data is presented. In
addition, the focus is put on the deposition schemes commonly used in nuclear
emergency context. |
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DOI: | 10.48550/arxiv.2408.11460 |