عنوان مقاله [English]
Piano key weir has a higher effective length in comparison with other weir types. Piano key weir Lateral weirs can be employed in irrigation and drainage networks, flood control systems and water & waste-water systems instead of common side weirs. Keeping in view that discharge coefficient evaluation of the weirs is mandatory in channels having longitudinal curvatures, in this investigation; discharge coefficient of a Type-C piano key weir was studied in 30-degree sector of a channel having longitudinal curvature. During course of investigating 12 piano key weirs were investigated by performing 133 experiments on discharge flow. Influential parameters were defined using dimensional analysis and then their impact was analyzed. An experimental equation was developed for discharge coefficient calculation in the conditions under consideration. The accuracy of the equation was acceptable by having a correlation coefficient of 0.916 and mean absolute error of 0.089. Therefore, it can be suggested that the equation can be used for discharge coefficient estimation in design of piano key side weir.
Agaccioglu, H., Emiroglu, M. E. and Kaya, N. 2012. Discharge coefficient of side weirs in curved channels. In Proceedings of the Institution of Civil Engineers-Water Management. 165, 339-352: Thomas Telford Ltd.
Agaccioglu, H. and Yüksel, Y. 1998. Side-weir flow in curved channels. J. Irrig Drain. Eng. 124(3):
Azimi, H., Hadad, H., Shokati, Z. and Salimi, M. S. 2015. Discharge and flow field of the circular channel along the side weir. Can. J. Civil Eng. 42(4): 273-280.
Aydin, M. C., Öztürk, M. and Yücel, A. 2015. Experimental and numerical investigation of self-priming siphon side weir on a straight open channel. Flow Meas. Instrum. 45, 140-150.
Borghei, S. M., Jalili, M. R. and Ghodsian, M. A. S. O. U. D. 1999. Discharge coefficient for sharp-crested side weir in subcritical flow. J. Hydraul. Eng. 125(10): 1051-1056.
Coşar, A. and Agaccioglu, H. 2004. Discharge coefficient of a triangular side-weir located on a curved channel. J. Irrig. Drain. Eng. 130(5): 410-423.
Emiroglu, M. E., Kaya, N. and Agaccioglu, H. 2009. Discharge capacity of labyrinth side weir located on a straight channel. J. Irrig. Drain. Eng. 136(1): 37-46.
Fares, Y. and Herbertson, J. 1993. Behaviour of flow in a channel bend with a side overflow (flood relief) channel. J. Hydraul. Res. 31(3): 383-402.
Izadinia, E. and Heidarpour, M. 2016. Discharge coefficient of a circular-crested side weir in rectangular channels. J. Irrig. Drain. Eng. 142(6): doi:10.1061/(ASCE)IR.1943-4774.0001025.
Machiels, O., Erpicum, S., Archambeau, P., Dewals, B. and Pirotton, M. 2012. Influence of the relative alveoli widths on Piano Key Weirs efficiency for varied weir heights. Proceedings of the International Symposium on Dams for a Changing World. June 5. Tokyo, Japan.
Mohammed, A. Y. 2015. Numerical analysis of flow over side weir. J. King Saud Uni. Eng. Sci. 27(1):
Nandesamoorthy, T. and Thomson, A. 1972. Discussion of spatially varied flow over side weir. J. Hydrol. Eng. 98(12): 2234-2235.
Hager, W. H. 1987. Lateral outflow over side weirs. J. Hydraul. Eng. 113(4): 491-504.
Ranga-Raju, K. G., Gupta, S. K. and Prasad, B. 1979. Side weir in rectangular channel. J. Hydraul. Div. 105(5): 547-554.
Roushangar, K., Alami, M. T., Majedi-Asl, M. and Shiri, J. 2017a. Modeling discharge coefficient of normal and inverted orientation labyrinth weirs using machine learning techniques. ISH J. Hydraul. Eng. 23(3): 1-10.
Roushangar, K., Alami, M. T., Majedi-Asl, M. and Shiri, J. 2017b. Experimental evaluation of free and submerged flow over piano key weirs. Irrig. Drain. Struct. Eng. Res. 19(70): 113-126. (in Persian)
Roushangar, K., Alami, M. T., Shiri, J. and Majedi-Asl, M. 2017c. Determining discharge coefficient of labyrinth and arced labyrinth weirs using support vector machine. Hydrol. Res. 49(3): doi: 10.2166/Nh.2017.214.
Singh, R., Manivannan, D. and Satyanarayana, T. 1994. Discharge coefficient of rectangular side weirs. J. Irrig. Drain. Eng. 120(4): 814-819.
Subramanya, K. and Awasthy, S. C. 1972. Spatially varied flow over side-weirs. J. Hydraul. Div.
Kabiri-Samani, A. and Javaheri, A. 2012. Discharge coefficients for free and submerged flow over piano key weirs. J. Hydraul. Res. 50(1): 114-120.