Due to construction of spur-dike structures in river streams and reducing flow width, a shear distribution change may occur from upstream to downstream side of structure. So, this leads to formation of wake vortices around spur-dike which results in extension of scour hole and may increase the risk of structure failure, as well. In the present study, three different kinds of non-submerged sacrificial piles in number and distance from the structure and with the skew angle of 30° were experimentally investigated. All the experiments were carried out in clear-water conditions and with the uniform sediment. The Results showed that under limitation of this study, use of the piles had a moderate efficiency for reduction of the maximum scour depth and the scour volume. Furthermore, the results indicated that efficiency of the sacrificial piles was a strong function of their geometric arrangement.
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