Modeling of leachable 137Cs in throughfall and stemflow for Japanese forest canopies after Fukushima Daiichi Nuclear Power Plant accident

Loffredo, Nicolas; Onda, Yuichi; Kawamori, Ayumi; Kato, Hiroaki

doi:10.1016/j.scitotenv.2014.06.059

Cited by 56 publications

(26 citation statements)

References 24 publications

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“…This indicates that the radiocesium deposited in the forest has steadily remained within the forest ecosystem (Forestry and Forest Products Research Institute, 2015). Detailed studies have also been performed, which focused on the initial transfer of radiocesium from a canopy to the forest floor via throughfall, stemflow, and litterfall processes (Hisadome et al, 2013;Kato et al, 2012;Teramage et al, 2014;Loffredo et al, 2014) and outflow from a forested mountainous region (Yoshimura et al, 2015;Nishikiori et al, 2015). In addition to the above field-based investigation studies, a modeling assessments of radiocesium fate in a forest ecosystem have been conducted (Hashimoto et al, 2013;Mahara et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Input and output budgets of radiocesium concerning the forest floor in the mountain forest of Fukushima released from the TEPCO's Fukushima Dai-ichi nuclear power plant accident

Niizato

Abe

Mitachi

et al. 2016

Journal of Environmental Radioactivity

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Estimations of radiocesium input and output concerning the forest floor within a mountain forest region have been conducted in the north and central part of the Abukuma Mountains of Fukushima, northeast Japan, after a 2-3 year period following the TEPCO Fukushima Dai-ichi nuclear power plant accident. The radiocesium input and output associated with surface washoff, throughfall, stemflow, and litterfall processes at experimental plots installed on the forest floor of evergreen Japanese cedars and deciduous Konara oaks have been monitored. Despite the high output potential in the mountainous forest of Fukushima, the results at both monitoring locations show the radiocesium input to be 4-50 times higher than the output during the summer monsoon in Fukushima. These results indicate that the radiocesium tends to be preserved in the forest ecosystem due to extremely low output ratios (0.05%-0.19%). Thus, the associated fluxes throughout the circulation process are key issues for the projecting the environmental fate of the radiocesium levels, along with the subsequent reconstruction of life emphasized within the setting.

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Section: Introductionmentioning

confidence: 99%

Input and output budgets of radiocesium concerning the forest floor in the mountain forest of Fukushima released from the TEPCO's Fukushima Dai-ichi nuclear power plant accident

Niizato

Abe

Mitachi

et al. 2016

Journal of Environmental Radioactivity

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“…For example, Tanaka et al (2014) found that the silt and sand fractions contained 95% of the total 137 Cs activities in suspended sediment. Furthermore, radiocesium is contained within the tree canopy, leaf litter and soil organic matter in contaminated forests Kato et al, 2012;Loffredo et al, 2014). Accordingly, this current study compares contaminated source contributions to both the <2 mm (bulk) and <63 mm (fine) fractions.…”

Section: Sample Processing and Analysesmentioning

confidence: 98%

“…Ciais et al, 2008;Doetterl et al, 2012). In the Fukushima region, radiocesium contamination is found in leaves, leaf litter and soil organic matter (Hashimoto et al, 2012;Koarashi et al, 2012;Loffredo et al, 2014). Therefore, the particulate matter was traced in both the bulk (<2 mm) and fine (<63 mm) fractions.…”

Section: Particulate Matter Propertiesmentioning

confidence: 99%

“…As the majority (~66%) of the landscape receiving high levels of radiocesium fallout (i.e. >1000 kBq m À2 ) were a mixture of evergreen and deciduous forests (Hashimoto et al, 2012), a significant quantity of radiocesium is also stored within the forest canopy, leaf litter, and soil organic matter (Hashimoto et al, 2013;Koarashi et al, 2012;Loffredo et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Do forests represent a long-term source of contaminated particulate matter in the Fukushima Prefecture?

Laceby

Huon

Onda

et al. 2016

Journal of Environmental Management

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a b s t r a c tThe Fukushima Daiichi Nuclear Power Plant (FDNPP) accident resulted in radiocesium fallout contaminating coastal catchments of the Fukushima Prefecture. As the decontamination effort progresses, the potential downstream migration of radiocesium contaminated particulate matter from forests, which cover over 65% of the most contaminated region, requires investigation. Carbon and nitrogen elemental concentrations and stable isotope ratios are thus used to model the relative contributions of forest, cultivated and subsoil sources to deposited particulate matter in three contaminated coastal catchments. Samples were taken from the main identified sources: cultivated (n ¼ 28), forest (n ¼ 46), and subsoils (n ¼ 25). Deposited particulate matter (n ¼ 82) was sampled during four fieldwork campaigns from November 2012 to November 2014. A distribution modelling approach quantified relative source contributions with multiple combinations of element parameters (carbon only, nitrogen only, and four parameters) for two particle size fractions (<63 mm and <2 mm). Although there was significant particle size enrichment for the particulate matter parameters, these differences only resulted in a 6% (SD 3%) mean difference in relative source contributions. Further, the three different modelling approaches only resulted in a 4% (SD 3%) difference between relative source contributions. For each particulate matter sample, six models (i.e. <63 mm and <2 mm from the three modelling approaches) were used to incorporate a broader definition of potential uncertainty into model results. Forest sources were modelled to contribute 17% (SD 10%) of particulate matter indicating they present a long term potential source of radiocesium contaminated material in fallout impacted catchments. Subsoils contributed 45% (SD 26%) of particulate matter and cultivated sources contributed 38% (SD 19%). The reservoir of radiocesium in forested landscapes in the Fukushima region represents a potential long-term source of particulate contaminated matter that will require diligent management for the foreseeable future.

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“…Intensive field monitoring carried out in other catchments revealed that the deposition of 137 Cs differs according to LULC (e.g., Yoshimura et al, 2015;Loffredo et al, 2014). However, directly applying this evidence to the 137 Cs inventory model according to LULC remains relatively difficult because physics-based process modeling based on measurement data has not yet been completed.…”

Section: Post-accident Simulationsmentioning

confidence: 99%

Integrated watershed modeling for simulation of spatiotemporal redistribution of post-fallout radionuclides: Application in radiocesium fate and transport processes derived from the Fukushima accidents

Mori¹,

Tada²,

Tawara³

et al. 2015

Environmental Modelling & Software

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Modeling of leachable 137Cs in throughfall and stemflow for Japanese forest canopies after Fukushima Daiichi Nuclear Power Plant accident

Cited by 56 publications

References 24 publications

Input and output budgets of radiocesium concerning the forest floor in the mountain forest of Fukushima released from the TEPCO's Fukushima Dai-ichi nuclear power plant accident

Input and output budgets of radiocesium concerning the forest floor in the mountain forest of Fukushima released from the TEPCO's Fukushima Dai-ichi nuclear power plant accident

Do forests represent a long-term source of contaminated particulate matter in the Fukushima Prefecture?

Integrated watershed modeling for simulation of spatiotemporal redistribution of post-fallout radionuclides: Application in radiocesium fate and transport processes derived from the Fukushima accidents

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