Using energy dissipaters on the soled aprons downstream of head structures is the main technique for accelerating hydraulic jump formation and dissipating a great amount of the residual harmful kinetic energy occurring downstream of head structures. In this paper, an experimental study was conducted to investigate some untested shapes of curved dissipaters with different angles of curvature and arrangements from two points of view. The first is to examine its efficiency in dissipating the kinetic water energy. The second is to examine the most effective shape and arrangement obtained from the aforementioned step in enriching the flow with dissolved oxygen for enhancement of the irrigation water quality. The study was held in the irrigation and hydraulic laboratory of the Civil Department, Faculty of Engineering, Assiut University, using a movable bed tilting channel 20 m long, 30 cm wide, and 50 cm high, using 21 types of curved dissipaters with different arrangements. A total of 660 runs were carried out. Results were analysed, tabulated and graphically presented, and new formulas were introduced to estimate the energy dissipation ratio, as well as the DO concentrations. Results in general showed that the dissipater performance is more tangible in dissipating the residual energy when the curvature is in the opposite direction to that of the flow. Also, the energy loss ratio increases with an increase in curvature angle (θ), until it reaches (θ = 120°), then it decreases again. The study also showed that using three rows of dissipaters give nearly the same effect as using four rows, concerning both the relative energy dissipation and dissolved oxygen content. So, it is recommended to use three rows of the curved dissipater with the angle of curvature (θ = 120°) in the opposite direction to that of the flow to obtain the maximum percentage of water energy dissipation downstream of head structures, and maximum dissolved oxygen content too
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Anandraj A. 2012 Investigational study on self aeration characteristic of hydraulic jump IOSR J. Mech. Civil Eng. (IOSR-JMCE) 4(2): 27-31.
Alikhani A. Behrozi-Rad R. Fathi-Moghadam M. 2010 Hydraulic jump in stilling basin with vertical end sill Int. J. Phys. Sci. (IJPS) 5(1): 25-29.
Ashour M.A Tarek S.A. Attar S. 2014 A new water energy dissipater for efficient energy dissipation and enriching the flow with dissolved oxygen content Limnol. Rev. 14(1):3-11.
Avery S. Novak P 1978 Oxygen transfer at hydraulic structures J. Hydraul. Eng. 104(11): 1521-1540.
Aziz F.E. Al-Baidban F.J.H. Abdul Halim G. 1999 Dissipation of hydraulic energy by curved baffle blocks Pertanika J. Sci. Technol. 7(1): 69-77.
Baylar A. Bagatur T. 2006 Experimental studies on air entrainment and oxygen content downstream of sharpcrested weirs Water Environ. J. 20(4): 210-216.
Baylar A. Hanbay D. Ozpolat E. 2008 An expert system for predicting aeration performance of weirs by using ANFIS Expert Syst. Appli. 35(3): 1214-1222.
Bestawy A. 2013 New shapes of baffle piers used in stilling basins as energy dissipators Asian Trans. Eng. (ATE) 3(1): 1-7.
Cox B.A. 2003 A review of dissolved oxygen modeling techniques for lowland rivers Sci. Total Environ. 314-316: 303-334.
[DEQ] Department of Environmental Quality (State of Michigan) 2006 Part 4. Water Quality Standards [of Part 31 Water Resources Protection of Act 451 of 1994] (Filed with the Secretary of State on January 13 2006) Lansing pp. 62. Retreived from http://www.michigan.gov/documents/deq/wrd-swas-part4rules_492815_7.pdf
El Baradei S.A. 2011 Effect of free hydraulic jump on dissolved oxygen concentrations in water at different vertical control gate openings ICASTOR Journal of Engineering 14(3): 281-291.
El Baradei S.A. 2013 Saving on energy of and determining the best location of water treatment plant along rivers depending on the effect of broad crested weir on dissolved oxygen concentrations in water J. Clean Energy Technol. 1(3): 202-205.
El-Gawhary E.L. Soliman M.A. Hamed M.E. Zaghlor Y. 1986 Characteristics of flow near concave obstacles Civil Engineering Research Magazine (CERM) A1-Azhar University 8(1).
Gameson A. 1957 Weirs and aeration of rivers J. Inst. Water Eng. 11(5): 477-490.
Habib A.A. 2012 Study of free flow below vertical sluice gate with positive step in redial stilling basin Egypt. Int. J. Eng. Sci. Technology 15(1).
Habib A.A. Abdel-Azim M.A Abd-Allh Y.M. Saleh Y.K. 2012 Estimation of hydraulic jump characteristics in stilling basin with guide walls J. Eng. Sci. (JES) Assiut University 40(6):1599-1609.
Habib A.A. Nassar M.A. 2013 Characteristics of flow and scour under the effect of curved steel roughness elements Egypt. Int. J. Eng. Sci. Technol. (EIJEST) 16(3).
Kucukali S. Cokgor S. 2009 Energy concept for predicting hydraulic jump aeration efficiency J. Environ. Eng. 135(2): 105-107.
Nakasone H. 1987 Study of aeration at weirs and cascades J. Environ. Eng. 113(1): 64-81.
Negm A.M. Abdel-Aal G.M. Habib A.A. Owais T.M. 2003 Effect of end sill in radial basin on characteristics of free hydraulic jumps Proc. of the 1st Int. Conf. of Civil Engineering Science (ICCESI). Vol. 1 Cairo: p. 12.
Ozkan F. Kaya T. Baylar A. 2009 Study of the influence of venturi weir type on air bubble entrainment Sci. Res. Essays 4(11): 1184-1193.
Peterka A.J. 1958 Hydraulic design of stilling basin and energy dissipators Eng. Monograph 25 U.S. Bureau of Reclamation (USBR) Denver p. 221.
Rageh O.S. 1999 Effect of baffle blocks on the performance of radial hydraulic jump Proc. of the 4th International Water Technology Conference (IWTC) Alexandria: 255-269.
Shahmirzadi M. Sumi T. Kantoush S. 2012 The effect of end-sill geometry on functionality of In-ground stilling basin Annuals Disas. Prev. Res. Inst. Kyoto Univ. 55(2): 561-570.
Tiwari H.L. Gahlot V.K. Tiwari S. 2013 Reduction of scour depth downstream of pipe outlet stilling basin using end sill. Res. J. Eng. Sci. 2(27): 20-25.
Van der Kroon G.T.N. Schram A. 1969 Weir aeration - Part I H2O 22: 528-537.
Wafaie E.M. 2001a Optimum height for bed sills in stilling basins Bull. Faculty Eng. Assiut University 29(1): 1-12.
Wafaie E.M. 2001b Optimum location for bed sills in stilling basins Bull. Faculty Eng. Assiut University 29(1): 13-24.
Wilhelms S. Gulliver J. Parkhill K. 1992 Reaeration at lowhead hydraulic structures Tech. Rep. HL-91 US Army Engineer Waterways Experiment Station Vicksburg Miss.
Wilson P.C. 2013 Water Quality Notes: Dissolved Oxygen IFAS Extension Bulletin SL313 Institute of Food and Agricultural Sciences Uniwersity of Florida Gainesville pp. 11. Retrieved from http://edis.ifas.ufl.edu.