Abstract
Although watershed of Lake Teganuma have had a lot of radioactive hot spots since 2011, it is unclear when radioactive contamination in urban area, river and lake will be purified. This study attempts to evaluate radioactive cesium supply from the watershed to Lake Teganuma by using a distributed model for SS in watershed and monitoring data for radioactive cesium in watershed, river and lake. The present model is developed based on "SIPHER model" which is a distributed model for water and material cycles. The results indicate that 1)the present model can reproduce accurately temporal variations of river discharge and SS flux, and 2)the supply of radioactive cesium evaluated with the product of the simulated SS and measured cesium were good agreement with the observed data, showing the fundamental validity of the present approach.
