مشخصات پژوهش

In irrigation and drainage networks, trapezoidal open channels are common due to their hydraulic efficiency and cost-effectiveness. However, for effective flow management, channel cross-sections are often transitioned to rectangular stilling basins. This study explores the behavior of hydraulic jumps in a trapezoidal stilling basin fitted with triangular blocks. The blocks varied in height (1.0, 1.5, and 2.0 cm) and length (2.5 to 6.0 cm), with three placement angles (30, 45, and 60 degrees) and two block arrangements (A and B). Arrangement A had block densities of 5.6%, 6.7%, and 8.9%, while Arrangement B featured densities of 10%, 12.2%, and 13%. The findings revealed that block height significantly influenced hydraulic jump control, with densities of 6.7% (Arrangement A) and 12.2% (Arrangement B) being the most effective. Additionally, a 45-degree block angle was optimal for jump regulation in both arrangements. Overall, Arrangement B exhibited superior performance in controlling the energy dissipation, length, and second depth of the hydraulic jumps. Dimensional analysis was used to establish relationships for predicting hydraulic jump characteristics within the trapezoidal stilling basin.