B13A-0593
Mathematical Modeling of Radiocesium Migration and Air Dose Rate Changes in Eastern Fukushima Prefecture
Monday, 14 December 2015
Poster Hall (Moscone South)
Akihiro Kitamura1, Kazuyuki Sakuma2, Hiroshi Kurikami1, Alex Malins3, Masahiko Okumura3, Mitsuhiro Itakura3, Susumu Yamada4 and Masahiko Machida3, (1)Japan Atomic Energy Agency, Naka-Gun, Tokai-Mura, Japan, (2)JAEA Japan Atomic Energy Agency, Fukushima Environmental Safety Center, Toki, Japan, (3)JAEA Japan Atomic Energy Agency, Center for Computational Science & e-Systems, Kashiwa, Japan, (4)JAEA Japan Atomic Energy Agency, Center for Computational Science & e-Systems, Toki, Japan
Abstract:
Radioactive cesium that was deposited over Fukushima Prefecture after the accident at the Fukushima Daiichi nuclear power plant station is one of the major concerns regarding health physics today. Its migration is primarily by soil erosion and sediment transport within surface water during times of heavy rainfall and flooding. In order to predict the future distribution of radioactive cesium and resulting air dose rate at any location in Fukushima, we have integrated a number of mathematical models covering different time and spatial scales. In this presentation we report our overall scheme of prediction starting from sediment and radioactive cesium movement and resulting long term air dose rate changes. Specifically, we present simulation results of sediment movement and radioactive cesium migration using semi-empirical and physics based watershed models, and that of sediment and radioactive cesium behavior in a dam reservoir using one and two dimensional river simulation models. The model’s results are compared with ongoing field monitoring.
