Optimal Waterway Passage in Submerged Curved Deflector for Minimization of Local Scour

Many of the huge structures like New Esna, and New Nega Hammadi Barrages face a great harmful caused by local scour downstream (DS) their stilling basins. It is planned to redesign many of these structures to minimize these harmful impacts of the DS local scour. This research paper presents the results of an extensive experimental investigation on using an optimized submerged curved deflector to efficiently minimize the local scour DS the stilling basin of the multivents regulators. Different percentages of waterway passage through the deflector were tested while the deflector was fixed at an optimized location. The tests were carried out under submerged flow conditions. The main goal of the present research paper is to determine the optimal percentage of waterway passage of the tested deflector. In order to achieve this goal, the effects of flow submergence, Froude number, operation policy of gates and percentage waterway passage of deflector on the maximum scour dimensions (depth and length) and on the velocity distribution near to bed were investigated. It was found that a waterway passage of 28% minimize both the scour dimensions and the near-bed-velocity. An average reduction of 86% in the maximum scour depth and 77% in the near-bed-velocity was obtained when the deflector was fixed at the optimal position.