Investigation of Hydraulic Jump Over Rough Sloping Floor in Prismatic Rectangular Channel—An Experimental Study

Abstract

Hydraulic jump is the one, which has widely been studied in hydraulic engineering. It is the most regular encountered cases of rapidly varied flow in hydraulic engineering. Very limited studies have been reported in literature on the performance of the behavior of hydraulic jump, only for smooth and rough horizontal channel beds. This study attempts to investigate the characteristics of hydraulic jumps formed on rough sloping channel beds under different flow conditions using laboratory experiments. A series of experiments were conducted in a rectangular flume having artificially roughened beds which is formed by placing concrete with different roughness and tilting flume slope. This study concerns with the investigations of effects on slopes of channel and channel bed roughness height at hydraulic characteristics. To achieve this, the bed of flume was provided the roughness with the help of different size of gravels (d50 = 1, 1.2, 1.5 and 1.7 cm) and three different channels slopes (0.0115, 0.0146, 0.0174) were used. In all 48 different runs were conducted with varying discharge and approach supercritical flow depth. The available empirical relationships for estimating the sequent depth ratio were first checked for their accuracy for new data. As the existing relationships were inadequate, new relationship are proposed, herein for parameter of the hydraulic jump. Comparison of observed values of sequent depth ratio with calculating values coming from respective proposed relationship showed satisfactory agreement.