Investigating scouring phenomenon in complementary channels with screen plates

Abstract

Recognizing the significance of scouring and implementing effective measures to mitigate and control its impact is paramount. This research delves into the examination of scouring downstream of hydraulic structures, employing screen plates as a pivotal component. To serve as energy absorbers, screen plates with varying aperture ratios of 40% and 50% have been strategically positioned at a distance of 1.5 m from the sluice gate. The primary focus is on evaluating the impact of screens on the maximum depth and length of the scour hole. Subsequently, a moving bed comprising particles of three distinct sizes (1.8, 2.6, and 5.2 mm) was selected. The outcomes of the study reveal that key parameters, including the thickness and opening ratio of the screens and their placement distance from the gate, significantly influence scouring. Notably, the maximum and minimum depths and lengths of the scour holes were observed in screens with opening ratios of 40% and 50%, respectively. Consequently, an increase in the opening ratio and thickness of the screens correlates with a reduction in the dimensions of scour holes, suggesting potential strategies for enhancing bridge resilience against scouring effects.