A theoretical and experimental study of the hydraulic jump evolving in a rough bottom channel

Abstract

This paper conducts a theoretical and experimental analysis of the hydraulic jump controlled by a threshold in rectangular channel with a rough bottom for various tested roughnesses namely ε = 6, 8, 10 and 12mm. We obtained a theoretical relationship, in dimensionless terms, linking the various parameters of the jump, showing the effect of the roughness of the bottom of the channel. It is essential to adjust at the end of this experiment the relation which is drawn by the theoretical development of the equation of the quantity of movement. The results showed that the presence of roughness positively influences the jumps which tend to shorten and dissipate more energy, a relation was proposed for this purpose to facilitate the determination of the dimensions of the damping basin.