عنوان مقاله [English]
Hydraulic engineers have always used applications in inclined drop to increase energy dissipation. In the present laboratory study, the simultaneous effect of the gabion and the vertical screens on the flow energy dissipation in the inclined drop structure was investigated. A total of 120 different experiments were performed for the flow range of 150 to 800 liters per minute and two heights, three inclination angles and two porosity ratios of vertical screens. The results show that in all models, the energy dissipation of the flow decreases with increasing the relative critical depth of the flow. The use of a vertical screens in a gabion inclined drop has little effect on flow energy dissipation, so that the average amount of increase in depreciation of the present study compared to a simple inclined drop equipped with vertical screens is 2.23%. The integrated system presented in the present study reduced the Froude number range from 1.66~2.11 to 0.83~1.9 compared to a simple inclined drop equipped with a vertical screen. A vertical screen with 50% porosity has a higher relative energy dissipation than a 40% porosity, and changing the inclination angle of a inclined gabion to the constant porosity of the screens does not cause much change in the amount of flow energy dissipation. Also, due to the low effect of the integrated system of the present study on the energy dissipation values of the flow, therefore, the simultaneous use of a vertical screens and inclined gabion is not economically recommended.
Aslankara, V. (2007). Experimental investigation of tailwater effect on the energy dissipation through screens (Doctoral dissertation, MS thesis, Middle East Technical Univ. Ankara, Turkey).
Aal, G. M. A., Fahmy, M. R., Elnikhely, E. A., & El-Tohamy, E. (2019). Energy dissipation and discharge coefficient over stepped gabion and buttress gabion spillway. Technology, 10(4), 260-267.
Balkis, G. (2004). Experimental Investigation of Energy Dissipation through Inclined Screens (Doctoral dissertation, MIDDLE EAST TECHNICAL UNIVERSITY).
Bos, M.G., Replogle, J.A. and Clemens, A.J. (1984). Flow measuring flumes for open channel systems, Wiley, New York, 340p.
Bozkuş, Z., Balkiş, G., & Ger, M. (2005). Effect of inclination of screens on energy dissipation downstream of small hydraulic structures. In Proceedings of the 17th Canadian Hydrotechnical Conference, Edmonton, Alberta, Canada (pp. 881-890).
Çakir, P. (2003). Experimental investigation of energy dissipation through screens (Doctoral dissertation, M. Sc. thesis, Department of Civil Engineering, Middle East Technical University, Ankara, Turkey).
Chanson, H., & Brattberg, T. (2000). Experimental study of the air–water shear flow in a hydraulic jump. International Journal of Multiphase Flow, 26(4), 583-607.
Chinnarasri, C., Donjadee, S., & Israngkura, U. (2008). Hydraulic characteristics of gabion-stepped weirs. Journal of Hydraulic Engineering, 134(8), 1147-1152.
Daneshfaraz, R., Asl, M. M., Razmi, S., Norouzi, R., & Abraham, J. (2020a). Experimental investigation of the effect of dual horizontal screens on the hydraulic performance of a vertical drop. International Journal of Environmental Science and Technology, 1-10.
Daneshfaraz, R., Majedi Asl, M., Bazyar, A., Abraham, J., & Norouzi, R. (2020b). The laboratory study of energy dissipation in inclined drops equipped with a screen. Journal of Applied Water Engineering and Research, 1-10.
Daneshfaraz, R., Bagherzadeh, M., Ghaderi, A., Di Francesco, S., & Asl, M. M. (2021). Experimental investigation of gabion inclined drops as a sustainable solution for hydraulic energy loss. Ain Shams Engineering Journal, 12(4), 3451-3459.
Hager, W. H., & Bremen, R. (1989). Classical hydraulic jump: sequent depths. Journal of Hydraulic Research, 27(5), 565-585.
Leu, J. M., Chan, H. C., & Chu, M. S. (2008). Comparison of turbulent flow over solid and porous structures mounted on the bottom of a rectangular channel. Flow Measurement and Instrumentation, 19(6), 331-337.
Mahmoud, M.I., Ahmed, S.S. And Al-Fahal, A.S.A. (2013). Effect of different shapes of holes on energy dissipation through perpendicular screen. Journal of Environmental Studies, 12, 29-37.
Peterka, A. J. (1958). Hydraulic design of stilling basins and energy dissipaters engineering monograph No. 25. US Bureau of Reclamation, Denver Colorado.
Rajaratnam, N., & Hurtig, K. I. (2000). Screen-type energy dissipator for hydraulic structures. Journal of Hydraulic Engineering, 126(4), 310-312.
Rajaratnam, N. (1976). Turbulent jets (Vol. 5). Elsevier.
Sadeghfam, S., Akhtari, A. A., Daneshfaraz, R., & Tayfur, G. (2015). Experimental investigation of screens as energy dissipaters in submerged hydraulic jump. Turkish Journal of Engineering and Environmental Sciences, 38(2), 126-138.
Sadeghfam, S., Daneshfaraz, R., Khatibi, R., & Minaei, O. (2019). Experimental studies on scour of supercritical flow jets in upstream of screens and modelling scouring dimensions using artificial intelligence to combine multiple models (AIMM). Journal of Hydroinformatics, 21(5), 893-907.
Sholichin, M., & Akib, S. (2010). Development of drop number performance for estimate hydraulic jump on vertical and sloped drop structure. International Journal of Physical Sciences, 5(11), 1678-1687.
Shaker A. Jalil, Sarhan A. Sarhan, Bshkoj S. Hussein, Jihan M. Qasim. (2019). Effect of Gravel Size and Weir Height on Flow Properties of Gabions. Journal of University of Babylon for Engineering Sciences, Vol. (27), No. (2).
Wagner, W. E. (1956). Hydraulic Model Studies of the Check Intake Structure-Potholes East Canal, Bureau of Reclamation Hydraulic Laboratory Report Hyd. 411.
Wüthrich, D., & Chanson, H. (2014). Hydraulics, air entrainment, and energy dissipation on a Gabion stepped weir. Journal of Hydraulic Engineering, 140(9), 04014046.