摘要：This paper outlines circumstances regarding development of models to evaluate radioactive cesium behavior in river systems and discusses issues to be considered. The study used a relatively simple approach, parameterizing the transfer rate of radionuclides from one component to others, using, for example, soil-loss models and multi-compartment models. These models were applied to calculate the annually averaged transport behavior of radioactive cesium across entire river basins. On the other hand, detailed river models and water transport models were applied to evaluate the behavior during each high water event. A comparison of these models indicates that the amounts of discharged radioactive cesium brought mostly by wash loads are more or less successfully calculated by all models investigated. Liquid wash-off and/or desorption behavior is expected to be modeled in detail to calculate the future behavior of dissolved cesium, which is thought to migrate easily into ecosystems.
关键词：radioactive cesium; river system; transport modeling
