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A prediction model was constructed to estimate the variations of DO in the reservoir and the downstream of the dam associated with the sediment flushing. Based on the investigation of the sediment flushing in case of Dashidaira dam located in Kurobegawa-river, it is assumed that DO decrease is caused by Fe (II) oxidation, which have been reduced in the bottom sediment.To estimate quantitatively the influence of accumulating duration on DO decrease, the model describing the transport and transform process of DO, Fe (II) and Fe (III) was incorporated into the one-dimensional sediment movement model. The validity of the present model is verified by the comparison of predicted results with the measured ones of the sediment flushing operations carried out at the dam on 1994 and 1999.

A NUMERICAL MODEL OF DO VARIATION WITH SEDIMENT FLUSHING