[2A13-19] Environmental Radioactivity and Monitoring 3

[2A18] Investigation on distribution of radioactive substances in Fukushima

(18)Analysis of radiocesium discharge using GeoWEPP in Iitate village, Fukushima

*Seigo FUJIWARA¹, Kazutoshi OSAWA² (1. Univ. of Tsukuba, 2. Utsunomiya Univ.)

Keywords:Radiocesium, Soil erosion, Modelling, GeoWEPP

On March 11th, 2011, a massive tsunami inundated the Fukushima Dai-ichi Nuclear Power Plant, which resulted in an enormous amount of radioactive fallout and deposition on the soil in Fukushima Prefecture. Radiocesium deposited on the soil is predicted to be discharged into coastal and fluvial areas during rainfall events. Especially, the half-life of radiocesium137 (¹³⁷Cs) is 30.2 years. Thus, the effects in Fukushima Prefecture is an ongoing, long-term issue to the local population. The objectives of this study are (i) to clarify the ¹³⁷Cs discharge using the Geospatial Interface for the Water Erosion Prediction Project (GeoWEPP), and (ii) to identify the sources of the ¹³⁷Cs discharge in the watersheds. As a result, the sources of ¹³⁷Cs discharge were determined.