Mahmoud Debabeche

Ressaut contrôléar seuil dans un canal profilé en U

The control of a hydraulic jump by both thin-crested and broad-crested sills in a U-shaped channel is examined theoretically and experimentally. Under certain simplifications, the theoretical development results in explicit relations for the relative sill height, by including the effect of approach velocity. This also leads to a similar condition for the control by a sill in the rectangular channel, by extension of the Forster and Skrinde approach. A particular study is presented to define the conditions required for the minimum height of a broad-crested sill. Finally, the relative length of jump is quantified by accounting for the relative depth of the approaching flow.

Effect of sill in the hydraulic jump in a triangular channel/ Effet du seuil sur le ressaut hydraulique dans un canal triangulaire

Hydraulic jumps are experimentally examined in a horizontal symmetrical triangular channel of 90° central angle. This study investigates the main features of both the minimum-B jump and the sill-controlled jump under various inflow conditions. The development of jumps was ensured using either a thin-crested or a broad-crested sill. Based on a large experimental program, the data were fitted to empirical relations to detect the effect of the inflow Froude number on the relative sill height, the sequent depths ratio and the non-dimensional toe position of the sill. The relations obtained are recommended for designing irrigation ditches.

Control of hydraulic jump by sill in triangular channel

The control of an hydraulic jump by a thin wall continuous sill in a triangular channel with an aperture of 90° is analyzed experimentally. A relationship for the control of the hydraulic jump under any conditions of generation is presented in an adimensionnal form in order to have a general validity character. The sill effect on the stilling basin is observed and evaluated. This research has its application in the ditch irrigation with triangular shape, using the jump ability to raise the flow head plane downstream.

Hydraulic jump in a sloped triangular channel

The hydraulic jump in a sloped triangular channel of 908 central angle is theoretically and experimentally exam- ined. The study aims to determine the effect of the channels slope on the sequent depth ratio of the jump. A theoretical relation is proposed for the inflow Froude number as function of the sequent depth ratio and the channel slope. An experi- mental analysis is also proposed to find a better formulation of the obtained relation. For this motive, six positive slopes are tested. The relations obtained are recommended for designing irrigation ditches.

Experimental study of sequent depths ratio of hydraulic jump in sloped rectangular channel

The hydraulic jump in a sloped rectangular sidewall inclination angle was experimentally examined. The study aimed to determine the effect of channel slope on the sequent depths ratio of the jump. An experimental analysis is proposed to determine experimental relationships of the inflow Froude number as a function of the sequent depth ratio of the jump and the channel slope. For this purpose, positive slopes were tested.

Experimental Study of Sequent Depths Ratio of Hydraulic Jump in Sloped Trapezoidal Chanel

The hydraulic jump in a sloped trapezoidal channel of 72.68° sidewall inclination angle was experimentally examined. The study aimed to determine the effect of channel slope on the sequent depths ratio of the jump. An experimental analysis is proposed to determine experimental relationships of the inflow Froude number as a function of the sequent depth ratio of the jump and the channel slope. For this purpose, positive and negative slopes were tested.