抄録
A lot of non-overflow groynes that do not sink under the water at the ordinary water flow are used, and it is known to it does working that keeps away the water current form the river bank.On the other hand, when the water level is surpassing of the height of the groyne, it becomes to sink. In this study, the height of the groyne was made constant, depth was changed systematically, and it aimed to clarify the characteristic of the bed level variation and the flow velocity profile of the flowfield with a single groyne by the laboratory experiment under the condition to assume the Froude number to be 0.2. As a result, the maximum depth of scour has become small as the relative groyne higher. The groyne height when relative height grows, the ratio of the main flow velocity to the mean flow velocity has grown.
