Analysis of scour characteristics in presence of aerated crossing jets

Pagliara, Stefano; Palermo, Michele

doi:10.7158/w12-012.2013.16.2

Cited by 5 publications

(1 citation statement)

References 14 publications

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“…They observed that at all crossing angles the scour depth decreases with increasing the tailwater depth. Pagliara & Palermo (2013) studied the 3D scour by the two aerated crossing jets; they observed that the air in the jets changes the scour shape. Pagliara & Palermo (2017) studied the effect of vertical non-crossing jets by locating the virtual crossing point beneath the bed; they concluded that the virtual crossing point is an essential parameter in the scour shape.…”

Section: Introductionmentioning

confidence: 99%

Effect of sediment gradation on scour by symmetric crossing jets: an experimental investigation

2022

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A laboratory study with 162 experiments was designed and conducted to investigate the effect of three non-uniform sediment samples on the scour morphology by the symmetric crossing jets. The bed sediment materials with close median diameter values and different non-uniformities were utilized to investigate the scour at various crossing angles. The results were also compared with the equivalent single jet. The proper novel relationships were presented to predict the scour hole depth, and dimensions. The results showed that at a crossing angle of 30° with low and medium tailwater depth, the scour depth increases with increasing the non-uniformity of the bed materials. At the crossing angle of 30°, the armor layer was created perfectly that was thick on the bottom of the scour hole, but for the crossing angles of 70° and 110° it was thin and was a mixture of the coarse and fine particles. At low tailwater depth at the crossing angles of 70° and 110°, by increasing the non-uniformity of the sediments, the scour tended to be more asymmetric. At the high tailwater depth, for the crossing angles of 70° and 110° the scouring was less than that of the crossing angle of 30° and single jet.

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Section: Introductionmentioning

confidence: 99%

Effect of sediment gradation on scour by symmetric crossing jets: an experimental investigation

2022

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Scour process caused by multiple subvertical non-crossing jets

Pagliara

Palermo

2017

Water Science and Engineering

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The scour process induced by plunging jets is an important topic for hydraulic engineers. In recent decades, several researchers have developed new strategies and methodologies to control the scour morphology, including different jet arrangements and structures located in the stilling basin. It has been found that multiple jets can cause less scouring than single plunging jets. Based on this evidence, this study aimed to investigate the equilibrium morphology caused by multiple non-crossing jets. A dedicated laboratory model was built and experimental tests were carried out under different combinations of jet inclination angles, by varying the tailwater level and the virtual crossing point location, which was set below the original channel bed level. It was experimentally shown that the equilibrium scour morphology depends on the jet discharge, the differences in non-crossing jet inclination angles, the downstream water level, and the distance of the virtual crossing point from the original channel bed level. In particular, the last parameter was found to be one of the most influential parameters, because of the resulting flow patterns inside the water body. Furthermore, the analysis of experimental evidence allowed for a complete and detailed classification of the scour hole typologies. Three different scour typologies were distinguished and classified. Finally, based on previous studies, two novel relationships have been proposed to predict both the maximum scour depth and length within a large range of hydraulic and geometric parameters

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