Page - 186 - in Book of Full Papers - Symposium Hydro Engineering

2.3. Curvature Submerge Vanes Submerge vanes are vanes whose effective application in changing flow pattern and bed shear stress in order to control local erosion and change sediment movement pattern has been studied by many researchers. First, Odgaard and Kennedy (1983) and Odgaard and Spoljaric (1986) attempted to design submerge vanes. Then, extensive studies on the application of submerge vanes to avoid bed load entering the intake were done by Barkdoll et al. (1999), Nakato and Ogden (1998), Wang et al. (1996) and also to control riverine erosion by Odgaard and Wang (1991a, 1991b), Marelius (2001), Voisin and Townsend (2002). According to extensive research on designing these vanes in the mentioned fields, research and theory have been offered on the use of submersibles vanes and also optimal dimensions and arrangements for vortex settling basins. Vane dimensions were determined based on recommendations by Odgaard and Kennedy (1983) and considering the flow depth (d= 8 cm) which is the prolapse of jet flow in the inlet opening of the vortex settling basin. Submerge vanes are galvanized with a rectangular initial shape (Figure 4) and a thickness of 2 mm. Table 2 shows the dimensions of submerge vanes. Table 2 Dimensions of curvature submerge vanes Length of submerge vane Lv Height of submerge vane Hv Parameter vHvLvH 43   5.02.0   d vH Recommended by Odgaard and Kennedy (1983) vLvH  3 d vH 5.0 Applied value The vanes placed on the basin floor are curved. The curvature of any vane is equal to the circular arc laid on its perimeter. Therefore, given the radial distance of vanes from each other, vanes have six different curvatures with radiuses of 27.95, 40.45, 52.95, 65.45, 77.95 and 90.45 cm. Figure 5 shows six different types of vanes with different curvature. 186