Experimental Study of Discharge Coefficient and Flow Streamlines in a Trapezoidal Piano Key Side Weir

Document Type : Research Paper

Authors

1 hydraulic structure,civil engineering collage,tehran university,Tehran,Iran.

2 Hydraulic Structure, Civil engineering collage, Tehran university, Tehran, Iran.

3 Soil and Water Conservation Research Institute, Agricultural Research, Education and Promotion Organization, Tehran, Iran.

Abstract

The main application of spillway in rivers and dams reservoirs is control and diversion of flood and protection of their related structures. In this research, a laboratory study was performed to test 16 trapezoid piano key A type weir models with different pillars 10, 15 and 20 cm in a canal with 10 meters length, 0.6 m width and 0.6 m height. The proposed weirs were placed on the main canal wall with two arrangements. The results showed that the maximum overflow rate coefficient was corresponded to weirs with p=15cm in both arranments (1 and 2) and the dimentionless ratio of 0.4 <H/P> 0.2 0.4 and also to weir with dimentionless ratio of 0.5 <H/P and p=20cm. Finally, the trapezoid piano key weir with a p=15cm and a B=50cm identified to pass the most appropriate flow regime.

Keywords

Main Subjects

References

Afzalian,A. And Ahadian J.(2015). Piano Key Weir with Angular Parameters.National Science and Irrigation Engineering,38 (2),91-102. . (In Farsi)
Anderson, R. and Tullis, B. (2012). Piano Key Weir: Reservoir versus channel application. J. Irrig. Drain Eng, 138(8): 773–776.
Anderson, R. M. and Tullis,B. P. (2013). Piano key weir hydraulics and labyrinth weir comparison. J.Irr&Dra Eng, 139(3): 246-253.
Askari, R. And Vatankhah Mohammadabadi, A.(2018). Theoretical and laboratory study of lateral trapezoid lateral overflow in underwater conditions. Iranian Journal of Soil and Water Research. doi: 10.22059/ ijswr. 2018. 262443. 667972. g. (In Farsi)
Bagheri, S., and M. Heidarpour. (2012). Characteristics of flow over rectangular sharp-crested side weirs. J. Irrig. Drain. Eng, 138 (6),541–547. https://doi.org/10.1061/(ASCE)IR.1943-4774.0000433.
De Marchi, G. (1934). Saggio di teoria Del funzionamento degli stramazzi laterali. [In Italian.] L’Energia Elettrica ,11 (11): 849–860.
El-Khashab, A., and K. V. H. Smith. (1976). Experimental investigation of flow over side weirs. J. Hydral. Eng. Div, 102 (9), 1255–1268.
Erpicum, S., Silvestri, A., Dewals, B., Archambeau, P., Pirotton, M., Colombié, M.  And Faramond, L. (2013). Escouloubre Piano Key weir: Prototype versus scale models, Labyrinth and Piano Key weirs II. CRC press. London, 65–72.
Gandoshmin, A. and Norouzi, B. (2014). 3D hydrodynamics of curved piano key overflows on plan.J. Hydraulic,9 (3):61-79. (In Farsi)
Hamidinia, M., Hydarnezhad, M., Pourmohammadi, M.H., Masjedi, A. and Bordbar, A. (2018). Numerical modeling of the flow field around vertical circular weirs with piano key input. Iranian Journal of Soil and Water Research, Articles ready for publication.
Kabiri-Samani, A.R. and Javaheri, A. (2012).Discharge coefficient for free and submerged flow over the piano key weirs. J. Hydraulic Res, 50(1): 114-120.
Karimi, M., Attari, J., Saneie,M. and Jalili Ghazizadeh, M. R. (2018).Side Weir Flow Characteristics: Comparison of Piano Key, Labyrinth, and Linear Types.J. Hydraul. Eng, 144(12),1-13.
Karimi, M., Attari, J., Saneie, M. and Jalili, M. (2017). Experimental study of discharge coefficient of a Piano Key Side Weir. Labyrinth and Piano Key Weirs III – PKW .109-116.
Kazemi, J., Sanei, M. and Azhdari Moghadam, M. (2016). The effect of the scale on the profile of the water surface in an Ogee Weir with curvature in plan and with converging lateral walls. Journal of Applied Research of Irrigation and Drainage Structures Engineering, 17(66), 119-136.
Laugier, F.(2011).Design and construction of the first Piano Key Weir (PKW) spillway at the Goulours dam. Int. J. Hydropower & Dams, 14 (5), 94-101.
Lefebvre, V., Vermeulen, J. and Blancher, B. (2013). Influence of geometrical parameters on PK-Weirs discharge with 3D numerical analysis Labyrinth and piano key weirs-PKW. CRCpress, London. 49-56.
Lempérière, F., and Ouamane. A., (2003). The Piano Keys weir: a new cost-effective solution for spillways. International Journal on Hydropower & Dams, 10.5: 144-149
Maranzoni, A., M. Pilotti, and M. Tomirotti. (2017). Experimental and numerical analysis of side weir flows in a converging channel. J. Hydraul. Eng, 143 (7), 04017009. https://doi.org/10.1061/ (ASCE) HY.1943-7900.0001296.
Mehboudi,A., Attari, J. and Hosseini, S.A. (2016) .Experimental study of discharge coefficient for trapezoidal piano key weirs. J. Flow Measurement and Instrumentation.Elseveir,50, 65-72.
Mehri, Y., Soltani, J., Saneie, M. and Rostami, M. (2018)." Discharge Coefficient of a C-  Type Piano Key Side Weir at 30° and 120° Sections of a Curved Channel".J. Civil Engineering,4(7),1702-1713.
Michelazzo, G., H. Oumeraci, and E. Paris.( 2015). Laboratory study on 3D flow structures induced by zero-height side weir and implications for 1D modeling. J. Hydraul. Eng, 141 (10): 04015023. https://doi.org/10 .1061/(ASCE)HY.1943-7900.0001027.
Nasiri,S.,Kabiri Samani,A.R. And Asghari,K.(2016). Numerical modeling of the flow field around vertical circular with piano key weir. J. Hydraulic Res, 11(1): 53-66.
Oertel, M. (2015).Discharge coefficients of piano key weirs from experimental and numerical models. 36th IAHR World Congress the Hague. the Netherlands.
Rezaei, M., Amedi, A. And Aghajani Mazandarani, Gh. (2015). Experimental study of Labyrinth rectangular Weir. Journal of Water and Soil, 29 (6),1438-1446.
Riberio, M.L., Boillat, J.L., Schleiss, A., Laugier, F. and Albalat, C. (2007). Rehabilitation of stmarc dam-experimental optimization of a piano key weir. Proc. of 32nd Congress of IAHR. Vince. Italy.
Roshangar, K., Majediasl, M., Alami,M.T.And Shiri,J.(2018). Evaluation of the effect of arc-cycle angular variations on discharge coefficient of Labyrinth arches and arc Piano key. Iranian Journal of Soil and Water Research, 49(2),341-351.DOI:10/22059/ijswr.2018.231028.667658
Yarahmadi, B. and Ahadian, j. (2015). Hydraulic Experimental Piano Key Weir Flow in Different Blend Spacers. National Science and Irrigation Engineering, 39(4), 47-58. (In Farsi)
Iranian Journal of Soil and Water Research
Volume 50, Issue 9
January 2020
Pages 2261-2273

Files

Share

How to cite

Statistics