Determination of the Characteristics of Hydraulic Jump on Crushed Rough Bed

Abstract

newline Abstract newlinei newlineABSTRACT newlineOpen channel flow is where water flows down an open channel with its top surface newlineexposed to atmospheric pressure. Hydraulic jump a classical and an important newlinephenomenon in open channel flow, which sometimes is mainly used for kinetic energy newlinedissipation at the downstream side of a spillway. The stilling basins are commonly used newlineto dissipate the energy and protect the downstream floor from erosion. The jump length newlineand sequent depth are significant factors that govern the major characteristics of the newlinejump. newlineThis experimental research evaluates the effect of crushed stone bed on the hydraulic newlinejump. A study of the hydraulic jump, on a rectangular horizontal channel in Water newlineResource Laboratory, of Department of Civil Engineering, Visvesvaraya National newlineInstitute of Technology, Nagpur. The necessary related instrumentations have been newlinedesigned and installed as part of the present work. The study involves both experimental newlineinvestigation and theoretical computation. Extensive measurements have been made newlineregarding the characteristics of hydraulic jumps as sequent depths, energy dissipation on newlineartificially roughened beds for Froude numbers between 3 and 10. Five different types of newlinecrushed stones roughness elements having different roughness height were installed newlineseparately, on a channel bottom throughout the experiments to obtain rough surfaces and newlineafter each set, the size is increased. Roughness elements were built from the Coarse newlineaggregate (Crushed stone) implemented parallel to the flow direction. newlineThe selection of crushed stones was motivated by the fact that they are used as coarse newlineaggregate in concrete during the construction of the lined channels. These stones are newlinelocally available and can be broken as per the size required. One more added advantage newlineof these stones is that they have a very high degree of angularity , which adds an newlineadvantage of the more rough surface area being exposed to the flow Because of the high newlineangularity, their laying on the bed of the cha