Japan Geoscience Union Meeting 2018

Presentation information

[EJ] Evening Poster

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

[H-CG26] What scientists should do for reconstruction after Fukushima Daiichi Nuclear Power Plant Accident

Tue. May 22, 2018 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Taku Nishimura(Deptartment of Biological and Environmental Engineering, Graduate School of Agricultural and Life Sciences, University of Tokyo), Masaru Mizoguchi(Graduate school of Agricultural and Life Sciences, The University of Tokyo), Kosuke Noborio

[HCG26-P09] Radiocesium transport on the hillslope of a backyard mountain

*Kosuke Noborio1, Yuki Sunakawa1, Ryuta Honda1, Yuki Takagi1, Masaru Mizoguchi2, Taku Nishimura2 (1.Meiji University, 2.The University of Tokyo)

Keywords:soil, hydrology, colloid

The radiocesium (Cs) fallout from the Fukushima Dai-ichi Nuclear Power Plant was scraped off from the surface layer on a hillslope of a backyard mountain in Iitate Village, Fukushima Prefecture. Since the fallout radiocesium was removed from the soil surface within a 20 m range from houses, we continued to monitor changes in Cs concentration at the surface layer from the foothill to the Cs-remaining part along the hillslope. Just after the Cs-removing process, Cs concentration on the whole slope was similar from the foothill to the uphill. Radiocesium transport on the hillslope of a backyard mountain seemed to increase during big rainfall events. With time elapsed, Cs concentration seemed to increase in the middle and upper hillslopes. Interestingly, Cs concentration in the Cs-remaining part increased with time, meaning that Cs was transported from the further upper part of the hillslope. Long-term monitoring on the hillslope and vertical transport to the deeper soil layers should be needed.