Abstract
After the accident of Fukushima Dai-ichi Nuclear Power Plant (FDNPP), a large amount of radiocesium were deposited in the wide area and adsorbed strongly to the soil particles. To evaluate the environmental fate of radiocesium, it is necessary to predict the behaviors of soil particles by rain-runoff. In this study, the migration of soil particles in the Abukuma river basin, located in the vicinity of FDNPP, was analyzed by a hydrological/water quality model for the three years of 2009-2011. The hydrological model simulated well river flows in the basin both in flooding and non-flooding seasons. The water quality model could analyze the behaviors of soil particles: clay, silt, very fine sand and fine sand.
