Open AccessEnergy dissipation in gabion weirs
Author(s) -
Ali Mekki Al-Fawzy,
Fadhil M. Al-Mohammed,
Husam H. Alwan
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/671/1/012068
Subject(s) - weir , dissipation , flume , hydraulic jump , dimensionless quantity , jump , geotechnical engineering , mathematics , inverse , hydraulic structure , mechanics , flow (mathematics) , geometry , engineering , physics , thermodynamics , geography , cartography , quantum mechanics
The present study investigates the effect of hydraulic jumps as criteria for representation of the energy dissipation of flow in gabion weirs. A set of 25 laboratory experiments and 188 operation tests were carried out using a laboratory flume with dimensions 10 m long by 0.3 m wide, and 0.5 m high. The tested gabion weir had different five possible lengths, 0.4 m, 0.6 m, 0.8 m, 1.0 m, and 1.2 m, and the filling material used was natural quarry mono-graded gravel in five different sample sizes of average equivalent diameter 11.75 mm, 16.50 mm, 22.00 mm, 31.25 mm, and 43.75 mm. Operation discharge values ranged between 0.7 to 15.0 l/s. The data set was subject to dimensional analysis to generate dimensionless groups, and correlated using the Buckingham Pi-Theorem. The results of this analysis showed that the distance of hydraulic jump has a direct relationship with discharge and an inverse relationship with the diameter of the gravel in the sample. For specified discharges, the distance of hydraulic jump had an inverse relationship with the length of the gabion weir and a direct relationship with the proposed energy dissipation parameter.