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Report No.

Arrangement of an adequate environment survey program in small-scale land water environment

Okawa, Yasuhisa; Seya, Natsumi ; Hashimoto, Makoto  ; Nunokawa, Jun*; Matsuzawa, Hajime*; Yanagawa, Yukihide*; Iimoto, Takeshi*

Radioactive nuclide released at the accident of Fukushima Dai-ichi NPP accident fell on to land surface and was transferred to water environment. In this study, a systematic analysis on the distribution and movement of radioactive material in the small-scale land water environment based on the actual data and anlytic calculation was made. We selected Matsugasaki pond of Kashiwa sity as a research area. The Matsugasaki pond is an affordable size (60 m length, 30 m wide, "bottle gourd" shape) to make detail study. The specific characteristic of this pond is that the water inlet and outlet is same shore. 10 of sediment samples were collected, and that samples were distributed with particle size and all of the distributed samples were weighed and measured radioactive concentration. These data were utilized for modeling of the soil particle transportation in and around the Matsugasaki pond, using two types of calculation models, Nays2DH and Nays2DFood of iRIC. The movements of water and sediment are evaluated as follwings; In inlet/outlet front part, suspended sand in the flowing water is discharged with the water flow, the bottom become shallow at central zone and become deep at peripheral portion. In back part, the soil particles are kept in place and hardly flow out. These characteristics are consisten with actual sediment conditions. Thesefore, adequate combination of a few measurements of actual environment samples and appropriate analytic calculation could estimate the perspective of movement of radioactive sediments in small-scale land water environment. In can also contribute for Fukushima environmental recovery.



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