Abstract
Free and submerged hydraulic jumps are important phenomena in open channel flow. The basic characteristics of these jumps formed on smooth, horizontal channel beds were covered well in literature both experimentally and theoretically. However, not many studies are reported on submerged hydraulic jumps generated on rough beds. This study mainly aims to investigate the characteristics of submerged hydraulic jumps over rough, horizontal beds. But, as the submerged hydraulic jumps are created from free jumps, analyses of free jumps are also required to proceed with the present study. So, altogether 110 experimental runs were carried out under both smooth and rough bed conditions. All the experiments were carried out in a rectangular flume and for the rough bed condition. Bed of the flume was roughened by placing rectangular wooden strips at four different spacing. The hydraulic parameters such as initial water depths, subcritical sequent depth, tail water depth, back-up depth and flow rates were measured for different roughness. Using these available data, required data analyses were carried out and several relationships were developed in order to express the submerged hydraulic jump characteristics. Here, free and submerged hydraulic jumps were considered separately. ENGINEER, Vol. 47, No. 04, pp. 33-39, 2014
Highlights
Hydraulic jump is an important phenomena in open channel flows which is created by transferring a supercritical flow into a subcritical flow
The free jump is converted into a submerged jump, on which our study is mainly focused, when tail water depth becomes larger than the subcritical sequent depth
Various types of studies have been reported in literature for identification of the characteristics of submerged hydraulic jumps on smooth horizontal beds
Summary
Hydraulic jump is an important phenomena in open channel flows which is created by transferring a supercritical flow into a subcritical flow. Hydraulic jumps have been attracted to many researchers for a long period of time because of its importance in designing hydraulic structures and other special applications such as mixing of chemicals, aeration of water, de-chlorination etc. Among all these applications, energy dissipation is considered to be one of the most important applications for civil engineers. Various types of studies have been reported in literature for identification of the characteristics of submerged hydraulic jumps on smooth horizontal beds. Subhasish et al, (2003) has conducted extensive research work on the characteristics of turbulent flow in submerged jumps on rough beds. Further investigations have to be carried out to get a clear understanding of the characteristics of submerged hydraulic jumps on rough beds
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