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In this paper flume experiments were conducted to study effects of partial removal of a weir on bed morphology. The depth and width of the removed part were systematically changed. The channel formation and bed degradation were focused. It is found that the channel is formed at the center of the flume by partial removal. In comparing the systematic changes of the removal depth and width, it was noted that changes of the removal depth affects in wider area than the removal width. Moreover, the deep channel was confirmed in the channel. The results indicate that partially removed weir can improve sediment movement from the upstream to downstream. Since the various bed shapes can be formed by the partial removal, there is a possibility that can contribute to improve habitats of river organisms, such as riffle-pool structure and a smooth slope by deposition along the bank side.

CHANNEL TO DEVELOPMENT ON UPSTREAM DUE TO CHANGE OF PARTIALLY REMOVED WEIR