Experimental Investigation of the Effect of Sidewalls Slope on the Discharge Capacity of Trapezoidal Piano Key Weirs

Articles in Press

Document Type : Research Paper

Authors

1 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan,Iran.

2 M.Sc. Student in Water and Hydraulic Structures, Bu-Ali Sina University, Hamedan, Iran.

Abstract

Sloped piano key weirs, by adjusting the inclination of their sidewalls, enable improved hydraulic performance under various conditions. These weirs, with appropriate slopes, demonstrate better performance than non-sloped weirs by storing more water during low-flow conditions and providing more effective discharge during floods. The flow discharge in sloped piano key weirs is proportional to the upstream head, which contributes to increased efficiency and safety of dams. Trapezoidal piano key weirs, given their high efficiency, are well-suited for complex hydraulic conditions such as floods and variable flows. This study examines the performance of trapezoidal piano key weirs in both sloped and non-sloped configurations. The experiments were conducted in a channel with width and height of 60 cm. The laboratory models included trapezoidal piano key weirs of type A with slopes of 0, 5, 7.5, and 10 degrees. To investigate the effect of slope direction, the piano key weirs were inclined both in the flow direction and against the flow direction. The results showed that sloped trapezoidal piano key weirs inclined against the flow, with over 75% of the weir crest length engaged, have a higher discharge coefficient compared to other models. The discharge coefficient in the weir with a 5-degree slope against the flow direction is on average 7% higher than that of the non-sloped weir. The results of this study indicate that a trapezoidal piano key weir with a 5-degree slope against the flow direction performs better under flood and low-flow conditions compared to a non-sloped trapezoidal piano key weir.

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Iranian Journal of Soil and Water Research

Articles in Press, Accepted Manuscript
Available Online from 15 October 2024

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