渓流河川における魚道直上流部に設置される水制工の効果

抄録

To clarify transport of sediment and driftwood immediately upstream from the fishway in mountain stream, physical model experiments were conducted under the unsteady flow, and the transport of sediment and driftwood around the spur dike installed immediately upstream from the fishway was investigated.

When the distance of the spur dike from the side wall of the Sabo dam was 1.5 times that of the width of the fishway inlet, the sediment was not confirmed immediately upstream from the fishway after a flood stage. Furthermore, when the toe of the spur dike was located in the line with the toe of the side wall of the Sabo dam, driftwood did not approach the fishway inlet.