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IJSTR >> Volume 5 - Issue 3, March 2016 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Hydraulic Behavior Of Piano Key Weir Type B Under Free Flow Conditions

[Full Text]

 

AUTHOR(S)

Dr. Saleh Issa Khassaf, Dr. Laith Jawad Aziz, Zainab Ahmed Elkatib

 

KEYWORDS

Piano Key Weir, Physical modeling, Free Flow, Discharge coefficient, Type B.

 

ABSTRACT

In this study, laboratory experiments were performed to evaluate the effects of the weir geometry of a Piano Key Weir (PKW) type B on the discharge coefficient under free flow conditions. Experiments were conducted in a 15m long, 0.3m wide and 0.45m deep rectangular glass-walled flume. The experimental work includes testing of fourteen PKW models which results 290 tests to cover the effects of weir length and height, up-and downstream key widths, upstream apex overhangs length, dam height and noses length on the weir flow discharge coefficient as well PKW with outlet stepped key were considered in the analysis. Considering the experimental data, the dimensional analysis allowed the development of relations between discharge coefficient and the shape of the PKW and gave a good agreement. Experimental results showed that the most influential parameters for the tested PKW models are the Relative length L/W, Key widths W_i⁄W_o , PKW Height B/P, and Overhangs length B_o⁄B. The effectiveness of Piano Key Weir at low heads ratio (H/P=0.25) is up to 400% relative to Creager weir at the same head.

 

REFERENCES

[1] Schleiss, A. J. (2011). From Labyrinth to Piano Key Weirs – A historical review. Proceedings of the International Conference (Labyrinth and Piano Key Weirs – PKW 2011), Liège, Belgium, CRC Press, London, pp. (3-15).

[2] Lempérière, F., Vigny, J.-P. and Ouamane, A. , (2011), "General comments on Labyrinths and Piano Key Weirs: The past and present", Proceedings of the International Conference Labyrinth and Piano Key Weirs 2011, Liège Belgium, CRC Press, London, pp.(17–24).

[3] Lempérière, F. and Ouamane, A. (2003), "The Piano Keys weir: a new cost-effective solution for spillways", www.vncold.vn.

[4] Ouamane, A., (2011), "Nine years of study of the Piano Key Weir in the university laboratory of Biskra “lessons and reflections” ", Proceedings of the International Conference Labyrinth and Piano Key Weirs 2011, Liège, Belgium, CRC Press, London, pp. (51–58).

[5] Leite Ribeiro, M. , Pfister, M. , Schleiss, A. J. and Boillat, J. , (2012), "Hydraulic design of A-type Piano Key Weirs", Journal of Hydraulic Research Vol. 50, No. 4, pp. (400–408).

[6] Ouamane, A. and Lempérière, F. , (2006), "Design of a new economic shape of weir", in proc. of International Symposium on Dams in the Societies of the 21st Century, Barcelona, Spain, pp. (463-470).

[7] Noui, A. and Ouamane, A. , (2011), "Study of optimization of the Piano Key Weir", Proceedings of the International Conference Labyrinth and Piano Key Weirs 2011, Liège, Belgium, CRC Press, London, pp. (175–182).

[8] Kabiri-Samani , A. and Javaheri, A. , (2012), "Discharge coefficients for free and submerged flow over Piano Key weirs", Journal of Hydraulic Research, Vol. 50, No. 1, pp. (114–120).

[9] Anderson, R. M., (2011), "Piano Key Weir Head Discharge Relationships" , M.Sc thesis, Utah State University, Department of Civil and Environmental Engineering, Logan, Utah, USA.

[10] Pralong, J., Vermeulen, J., Blancher, B., Laugier, F., Erpicum, S., Machiels, O., Pirotton, M., Boillat, J.L., Leite Ribeiro, M., and Schleiss, A.J. (2011), "A naming convention for the Piano Key Weirs geometrical parameters", Proceedings of the International Conference Labyrinth and Piano Key Weirs 2011, Liège, Belgium, CRC Press, London, pp. (271–278).

[11] Sitompul, A. T., (1993), "Hydraulic Modelling of a Sharp Crested Labyrinth Weir", Master theses, Memorial University of Newfoundland, Faculty of Engineering and Applied Science, Newfoundland, Canada.