Accuracy evaluation of scour depth equations under the submerged vertical jet

Abstract

Scouring of sediment materials under submerged vertical jets is shown at grade-control structures, downstream of weirs, and submerged vertical water jets have several uses, including seabed sediment removal and dredging in ocean engineering. Numerous studies have been conducted to demonstrate the scour process and the variation of scour profile utilizing various influencing parameters. Many researchers developed equations for predicting the scour hole characteristics. Previous studies identified two types of scour hole depth configurations: static and dynamic scour depth and the variation of scour hole variations differs for long- and short-impinging jet height conditions. In this study, extensive data on non-dimensional static and dynamic scour depth under short- and long-impinging jets acquired from prior literature, and the previously proposed equations of static and dynamic scour depth were analyzed using graphical and statistical analysis. The findings demonstrated that the relationships proposed by Aderibigbe and Rajaratnam (1996) for long-impinging jets and Amin et al. (2021) for short-impinging jets predict the static scour depth better than the other equations. The proposed equations for dynamic scour depth under long- and short-impinging jets are highly biased and inaccurate.