利根川中流調節池群における越流堤への可動堰設置による治水機能の評価

摘要

The detention reservoir is one of the most effective countermeasures to prevent the flood damage in thealluvial plain. Most of such facilities are constructed with an overflow levee, but if we make a movableweir on that and make an artificial operation, some additional effects are expected. For instance, savingthe capacity of reservoir, we can prepare for the excess flood. Or, when smaller flood comes, we can keepthe needless inundation away from inside of the reservoir. So we considered the effectiveness for 3detention reservoirs in the middle Tone River by using numerical simulation model. Then we confirmedthe effects of movable weir construction and obtained some interesting results, but it was difficult tocontrol the harder excess flood without wise operation.