Japan Geoscience Union Meeting 2015

Presentation information


Symbol H (Human Geosciences) » H-CG Complex & General

[H-CG34] Nuclear Energy and Geoscience

Tue. May 26, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

Convener:*Eiji Sasao(Tono Geoscience Center, Japan Atomic Energy Agency), Hidekazu Yoshida(Nagoya University Museum)

6:15 PM - 7:30 PM

[HCG34-P02] Estimates of a sediment yield and a outflow of radioactive Cs with 3D laser scanner

*Takayoshi WATANABE1, Takuya OHYAMA1, Yasuo ISHII1, Tadafumi NIIZATO1, Hironobu ABE1, Katsuaki MITACHI1, Yoshito SASAKI1, Akihiro KITAMURA1 (1.Japan Atomic Energy Agency)

Keywords:F-TRACE project, accident at the Fukushima Daiichi Nuclear Power Station, 3D laser scanner, denudation rate

For an estimate of movement from forest to living spheres, it is important to understand value of movement of soil and radioactive Cs from forest. We measured volumes of deposit with 3D laser scanner in an erosion control dam in Fukushima prefecture on August 29, 2013 and December 3, 2014.
As a result of measurement, an amount of increase of sediment for 15 months is 0.5 m3. A denudation rate is 0.02 mm/year. This value is on the same level with denudation rates in meadows and forest, 10-2 - 10-1 mm/year (Fujiwara et al, 1999). And it is estimated that a variation of radioactive Cs is Cs-137:200,000,000 Bq, Cs-134:80,000,000 Bq.