Radioactivity Dynamics in River System
（2016）
ＱWill radioactive contamination continue to accumulate in reservoirs due to the inflow of radioactive cesium from rivers? 【Tendency of the change of the concentration in reservoir beds】
Ａ137Cs continues flowing to dam lake and accumulating in bottom sediment, however, the concentration of 137Cs from upstream tends to decrease with time.
- Investigation at Ogaki dam in Fukushima pref. revealed that the concentration of 137Cs in bottom sediment and precipitation particle was high just after accident and tend to gradually decreasing with time.
- This finding is in good agreement with the tendency for cesium flowing from forests into mountain rivers to be gradually decreasing with time (see Q Is there a continuous input of cesium contamination to rivers from forests?).
Fig.1 Map of Ogaki dam and sampling position of bottom sediment and precipitation particle
Map is cited from Map data by Geographical Survey Institute
Fig.2 Time change of radioactive cesium concentration of these sediment and sedimented particles
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