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Water 2017, 9(12), 945; doi:10.3390/w9120945

An Experimental Study of Hydraulic Jump in a Gradually Expanding Rectangular Stilling Basin with Roughened Bed

1
Department of Water Engineering, University of Tabriz, Tabriz 5166616471, Iran
2
Department of Civil, Architectural and Environmental Engineering, University of Napoli Federico II, Napoli 80125, Italy
*
Author to whom correspondence should be addressed.
Received: 25 August 2017 / Revised: 28 November 2017 / Accepted: 30 November 2017 / Published: 7 December 2017
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Abstract

The paper presents the results of an experimental study carried out to investigate the effect of geometric and hydraulic parameters on energy dissipation and location of the hydraulic jump, with a change in the height of roughness elements and the divergence of walls in different discharges. Experiments were conducted in a horizontal rectangular basin with gradual expansion 0.5 m wide and 10 m long. Four physical models were fixed in the flume. The measured characteristics of the hydraulic jump with different divergences ratio (B = b1/b2 = 0.4, 0.6, 0.8, 1) and the inflow Froude numbers (6 < Fr1 < 12) were compared with each other and with the corresponding values measured for the classical hydraulic jump. The results showed that the tailwater depth required to form a hydraulic jump and also the roller length of the hydraulic jump and the length of the hydraulic jump on a gradual expansion basin with the rough bed were appreciably smaller than that of the corresponding hydraulic jumps in a rectangular basin with smooth and rough bed. With the experimental data, empirical formulae were developed to express the hydraulic jump characteristics relating to roughness elements height and divergence ratio of wall. Also, the applicability of some empirical relationships for estimating the roller length was tested. View Full-Text
Keywords: energy dissipator; gradual expansion basin; hydraulic jump; dissipative elements energy dissipator; gradual expansion basin; hydraulic jump; dissipative elements
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hassanpour, N.; Hosseinzadeh Dalir, A.; Farsadizadeh, D.; Gualtieri, C. An Experimental Study of Hydraulic Jump in a Gradually Expanding Rectangular Stilling Basin with Roughened Bed. Water 2017, 9, 945.

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