2004 Volume 48 Pages 547-552
The effects of several kinds of permeable spur dike on 3-D flow structures and river bed evolution were investigated in curved open channels experimentally and numerically. In this study, three-dimensional mean flow structures were measured in a curved open channel with spur dikes arranged along the outer bank. Experiments were conducted in movable beds and the effects of spur dikes on the local scour were examined. The secondary flow cell was generated in the same manner as the uniform rod roughness cases. Outer-bank arrangements of permeable spur dikes can reduce the outer-bank scour, but additional scour is generated in different regions. A traditional hydraulic structure, “Seigyu” has the similar effects on flow structures as the pile dikes. A 2-D numerical simulation model can be applied to these spur dike cases with the same assumption for the secondary flow dispersion terms.
