Document Type : Research Paper
faculty of water science
In this research, the effect of a submerged wall constructed by six-leg elements on the topography of the bed in a 90-degree mild bend has been investigated. The experiments of this research have been conducted under different hydraulic conditions in particle Froude numbers of 2.5, 2.75, 3, and 3.25 and three relative lengths of 0.5, 0.333, and 0.166 and with three relative widths of 0.064,0.114 and 0.164. The results showed that in all evaluation experiments, the wall caused the thalweg to move away from the outer bank so that the amount of scouring of the outer bank was reduced by about 100% compared to the control experiments. Also, the position of maximum scours depth is formed away from the outer bank and in the inner part of the wall, which has added to the protection of the outer bank. It was observed that for a constant relative width, the maximum scouring depth decreased with increasing relative wall length, and for a constant relative length value, the maximum relative scouring depth increased with increasing relative submerged wall width.