Effect of bed roughness shape on mitigating scour the downstream of parallel sluice gates

چکیده مقاله

Parallel sluice gates are crucial components in hydraulic structures, offering cost-effective and operationally flexible solutions for flow control in wide channels. This laboratory investigation examines the effectiveness of different bed roughness configurations—specifically trapezoidal and cubic geometries—in mitigating local scour downstream of parallel sluice gates, a persistent challenge that threatens structural integrity. The study systematically evaluated scour parameters under varying flow conditions and gate configurations, employing both quantitative measurements and qualitative flow visualization techniques. Results demonstrate that trapezoidal roughness elements significantly outperform their cubic counterparts across all measured parameters. Specifically, trapezoidal configurations achieved reductions of 25.3% in Average scour depth, 22% in scour length, 30.5% in cross-sectional area, and 50% in scour volume, compared to modest reductions of 20%, 14.35%, 21.57%, and 34.7% respectively for cubic roughness elements. The flow expansion ratio (