Author(s): Yassin Jaafari Jourabi; Abdollah Ardeshir; Hojat Karami

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Keywords: Protective spur dike; Sacrificial spur dike; Vortex; Local scouring

Abstract: Many experimental investigations have been performed to increase the efficiency of spur dikes (SDs) .Previous studies on scouring around series of SDs have shown that the scouring occurring around each SD is a function of adjacent SDs dimensions as well as the stream conditions. It is well known that the maximum scour depth occurs at the first upstream SD. To reduce the scouring of the upstream SD, Karami et al, 2008 introduced a protective SD to be located upstream of the first SD with a shorter length. To further reduce the scouring around the series of SDs as well as the protective SD itself a sacrificial SD is suggested in the present work. This SD should be located upstream of the protective SD with even shorter length and provides a rather smooth transition from the river to the narrower section of SDs. To determine the optimal geometric parameters of sacrificial SD, various angles and distances from the protective SD were tested for it under clear-water condition and in a straight reach with a fixed flow depth.

DOI:

Year: 2015