Abstract

One of the most effective approaches for bank control erosion is using bank-attached vanes. In spite of superiority of the bank-attached vanes to spur dikes, the vans' tips are still vulnerable to local scour caused by flow-structure interaction. In this study, slotted bank-attached vanes are proposed to reduce local scour at the tip of the triangular submerged vane. For this, a rectangular slot is created parallel to the chord of the vane with the area of 10 percent of effective area of vane surface. Two types of conventional vanes and slotted vanes were installed at different angles of attack of 23, 30, 40 and 60 degrees in an arch flume. Experiments carried out in clear water conditions with different flow regimes with Froude numbers of Fr = 0.287, 0.304 and 0.322. The results show that slotted vane outperforms conventional vane by reducing maximum scour depth by about 70, 20, 17 and 54 percent for different angle of attacks of 23, 30, 40 and 60 degrees, respectively. The proposed slotted vane also resulted in reduction of scour hole volume around the vane and formed the scour hole away from the outer bank.

HIGHLIGHTS

  • Slotted submerged vanes are introduced.

  • Performance of slotted vanes are investigated.

  • The conventional and slotted vanes are compared.

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