Study of the experimental approach of the relative threshold of the hydraulic jump evolving in a rectangular channel of composed section with rough minor bed

Abstract

The aim of this experimental study is to analyze the ratio of the relative threshold of the hydraulic jump evolving in a rectangular channel composed with a rough minor bed. functional relations, in dimensionless terms, as a function of the Froude number and of the roughness were obtained.

Indeed, for a fixed initial height h₁, the increase in the incident Froude number causes both the displacement of the step downstream. therefore, it corresponds to a length Lj of the step and Lr of the roll, as well as a height h₂ downstream of the step and a height S of the threshold..