Preliminary calculation of sediment and Cs transport in the Ukedo River of Fukushima

Kurikami, Hiroshi  ; Kitamura, Akihiro   ; Yamaguchi, Masaaki ; Onishi, Yasuo*

We applied the TOMAM model to the Ukedo River as a preliminary analysis to roughly understand what was important for cesium migration. The main lessons were as follows: Cesium migrates mainly in high river discharge conditions. Migration in a dissolved form is important in low river discharge conditions, while suspended sediments, especially silt and clay, are main carriers of cesium in high discharge conditions. Bed contamination is mainly reflected by sediment erosion and deposition instead of direct sorption in the riverbed.