Displacement of a Hydraulic Jump in a Rectangular Channel: Experimental Study

The formation of a hydraulic jump is the result of rapid transition from supercritical to subcritical flow regime; this phenomenon is always accompanied by energy dissipation. Knowledge of where hydraulic jumps form is necessary to minimize the erosion risk in hydraulic structures. Protecting the floor of stilling basins, channels and rivers is one of the objectives of studying hydraulic jump characteristics. The present work aims to analyze the displacement of the hydraulic jump in a rectangular channel controlled by a sill. It permitted to find a general equation that allows determining the location of the hydraulic jump in a rectangular channel. This formula was obtained through an analysis of the experimental tests carried out at the LARGHYDE laboratory. Comparison between the displacements of the hydraulic jumps measured experimentally and those calculated by the general equation obtained showed that the absolute relative differences between them are mostly less than 10%, which gives validity to the general equation obtained.