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Cs released from the Fukushima Daiichi Nuclear Power PlantMasumoto, Yukio*; Miyazawa, Yasumasa*; Tsumune, Daisuke*; Tsubono, Takaki*; Kobayashi, Takuya; Kawamura, Hideyuki; Estournel, C.*; Marsaleix, P.*; Lanerolle, L.*; Mehra, A.*; et al.
Elements, 8(3), p.207 - 212, 2012/06
Times Cited Count：82 Percentile：92.24(Geochemistry & Geophysics)Present status of oceanic dispersion simulations of cesium 137 (Cs) directly discharged from Fukushima Daiichi Nuclear Power Plant are reviewed using five model outputs and other available informations, focusing on estimations of discharged amount of Cs and subsequent dispersion in a region off Fukushima during March and April, 2011. Common aspects and discrepancies among the simulated results are described. While the discharged amount spreads from about 1 to 27 P Bq of Cs among the estimates, the values obtained from the five models indicate 2 to 4 P Bq. With these total amounts and time evolutions of the discharge rate, mimicking observed Cs concentration near FDNPP, as a source for the dispersion calculation, all the five models simulated the Cs dispersion in the ocean reasonably well corresponding to the observed distributions.
Miyazawa, Daisuke*; Sanada, Hiroyuki; Kiyama, Tamotsu*; Sugita, Yutaka; Ishijima, Yoji*
Journal of MMIJ, 127(3), p.132 - 138, 2011/03
The geology around the Japanese coast exhibits a wide distribution of mudstones composed of fossil diatoms and silica rocks. These bedrocks are categorized as porous and low permeability rock. When underground openings at rocks with such rock mechanics properties are constructed, evaluation which takes into account flow-stress coupling behavior is required. Poroelasticity treats both pore fluids and the mineral particles which make up rocks as compressible. Consequently, its application can extend to rock that is harder than soil materials. In this study, laboratory experiments by using the siliceous rocks distributed in the Horonobe area, Hokkaido, Japan were carried out as a case study. Proposal method for obtaining poroelasic coefficients as well as determination of poroelastic coefficients distributed in the Horonobe area are described in this paper.
Miyazawa, Daisuke*; Kiyama, Tamotsu*; Ishijima, Yoji*; Sugita, Yutaka; Sanada, Hiroyuki
no journal, ,
no abstracts in English
Miyazawa, Daisuke*; Kiyama, Tamotsu*; Ishijima, Yoji*; Kumakura, Satoshi*; Sugita, Yutaka; Sanada, Hiroyuki
no journal, ,
no abstracts in English
