Characteristics aid Control of Local Flow in Downstream of River Bend

This study is concerned with the countermeasures to local scour in the downstream of river bend. The characteristic of the local flow around the river bend and the influence of spur dikes and rib-type structures on the feature of the flow is investigated through model experiments. Some usefull information of the flow affected by the river bend without countermeasures is obtained. It is shown that a spur dike set at the mid of bend section remarkably improve the conditions of main flow as well as the secondary flow; the effect of the dike depends on the set-angle. It is also indicated that the combination of a rib-type structure and a spur dike produces good results.