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Journal Articles

Characteristics of radio-cesium transport and discharge between different basins near to the Fukushima Dai-ichi Nuclear Power Plant after heavy rainfall events

Sakuma, Kazuyuki; Kitamura, Akihiro; Malins, A.; Kurikami, Hiroshi; Machida, Masahiko; Mori, Koji*; Tada, Kazuhiro*; Kobayashi, Takamaru*; Tawara, Yasuhiro*; Tosaka, Hiroyuki*

Journal of Environmental Radioactivity, 169-170, p.137 - 150, 2017/04

 Times Cited Count:18 Percentile:69.64(Environmental Sciences)

This paper describes watershed modeling of catchments surrounding the Fukushima Dai-ichi Nuclear Power Plant to understand radio-cesium redistribution by water flows and sediment transport. We extended our previously developed three-dimensional hydrogeological model of the catchments to calculate the migration of radio-cesium in both sediment-sorbed and dissolved forms. The simulations cover the entirety of 2013, including nine heavy rainfall events, as well as Typhoon Roke in September 2011. Typhoons Man-yi and Wipha were the strongest typhoons in 2013 and had the largest bearing on radio-cesium redistribution. The simulated $$^{137}$$Cs discharge quantities over the nine events in 2013 are in good agreement with field monitoring observations. Deposition mainly occurs on flood plains and points where the river beds broaden in the lower basins, and within dam reservoirs along the rivers. Differences in $$^{137}$$Cs discharge ratios between the five basins are explained by differences in the initial fallout distribution within the basins, the presence of dam reservoirs, and the input supply to watercourses. It is possible to use these simulation results to evaluate future radioactive material distributions in order to support remediation planning.

Journal Articles

Redistribution and export of contaminated sediment within eastern Fukushima Prefecture due to typhoon flooding

Kitamura, Akihiro; Kurikami, Hiroshi; Sakuma, Kazuyuki; Malins, A.; Okumura, Masahiko; Machida, Masahiko; Mori, Koji*; Tada, Kazuhiro*; Tawara, Yasuhiro*; Kobayashi, Takamaru*; et al.

Earth Surface Processes and Landforms, 41(12), p.1708 - 1726, 2016/09

 Times Cited Count:14 Percentile:62.25(Geography, Physical)

Sediment erosion and transport processes that are considered to be important in predicting the future radioactive material distribution through sediment-sorbed form in Fukushima Prefecture are simulated. Since large portion of the sediment is considered to be supplied into the rivers, it is important to trace their migration process in terms of each river basin. We choose five river basins, namely the Odaka, the Ukedo, the Maeda, the Kuma, and the Tomioka, from north to south, because of their importance in contamination aspects and prediction studies. The results are summarized as comprehensive dataset of sediment migration for particular river basins in typical typhoon events that account for the most of annual soil erosion. Detail calculations implemented for the amount of sediment supplied in to the river, deposited on river and dam beds, and exported to the ocean.

Journal Articles

Radiator design for detecting high-energy neutrons with a nuclear track detector

Oda, Keiji*; Imasaka, Yuichi*; Yamauchi, Tomoya*; Nakane, Yoshihiro; Endo, Akira; Tawara, Hiroko*; Yamaguchi, Yasuhiro

Radiation Measurements, 40(2-6), p.570 - 574, 2005/11

 Times Cited Count:7 Percentile:47.08(Nuclear Science & Technology)

no abstracts in English

Oral presentation

Development of dose monitor and dosimeter applicable to high-energy neutron

Endo, Akira; Sato, Tatsuhiko; Satoh, Daiki; Shikaze, Yoshiaki; Tanimura, Yoshihiko; Saegusa, Jun; Tsutsumi, Masahiro; Yamaguchi, Yasuhiro; Kaneko, Hirohisa; Oda, Keiji*; et al.

no journal, , 

no abstracts in English

Oral presentation

A Validation study on applicability of the thermal-hydrological-chemical coupling method to manage groundwater quantities and qualities in Yotsugi Former Open-pit Mine

Tawara, Yasuhiro*; Yoshida, Takafumi*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Application of hydro-chemical coupled simulator for control work design to reduce polluted water in Ningyo-toge uranium mine

Tawara, Yasuhiro*; Yoshida, Takafumi*; Matsuura, Taichi*; Fukazawa, Soki*; Tokoro, Chiharu*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Application of hydro-chemical coupled simulation technique for mine drainage control

Tawara, Yasuhiro*; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

7 (Records 1-7 displayed on this page)
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