Abstract
The present knowledge on the behaviour of hydraulic jump is only for smooth, horizontal channel beds and very limited studies have been reported in literature on the performance of hydraulic jumps on rough beds. This research attempts to investigate the characteristics of hydraulic jumps formed on rough, horizontal channel beds under different flow conditions using laboratory investigations. A series of experiments were carried out in a rectangular flume which consists of artificially roughened beds formed by placing rectangular wooden strips in specific intervals. The hydraulic parameters such as, initial water depth, sequent water depth, and flow rate were measured for different bed roughnesses. The analysis of experimental data showed that the rough bed reduces the distance to the jump from the gate and the sequent depth ratio than those on smooth beds while creating a high energy loss. With the availability of a large number of experimental data on hydraulic jumps over rough channel beds, mathematical formulations were developed to express the hydraulic jump characteristics relating roughness parameters such as; roughness density and roughness height. DOI: http://dx.doi.org/10.4038/engineer.v46i3.6779 ENGINEER, Vol. 46, No.03, pp.1-7, 2013
Highlights
Hydraulic jump is one of the most common phenomena in open channels
According to the published documents, the characteristics of hydraulic jumps over smooth horizontal beds as well as over smooth sloping channel beds have been well established
The objective of this study was to identify the characteristics of hydraulic jumps on rough channel beds, and several experiments were carried out and various relationships were developed between the hydraulic jumps parameters
Summary
Hydraulic jump is one of the most common phenomena in open channels. It is a process of transition of a supercritical flow into a subcritical flow by dissipating a large amount of energy. A limited number of investigations have been reported on the characteristics of hydraulic jumps over rough horizontal beds, and their results still exist only in journal papers. Rajaratnam [14] was one of the first researchers who carried out some studies on hydraulic jumps on rough beds. The studies about hydraulic jumps in smooth sloping channels have been carried out by Ohtsu and Yasuda [12] and Gunal and Narayanan [9].
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