Experimental study of discharge coefficient of trapezoidal arced labyrinth weirs of widened middle cycle

• Published in: Flow measurement and instrumentation 2021-06, Vol.79, p.101946, Article 101946
• Main Authors: Feili, Jamal, Heidarnejad, Mohammad, Masjedi, Alireza, AsadiLour, Mehdi
• Format: Article
• Language: English
• Subjects: Discharge coefficient; Hydraulic model; Labyrinth weir; Trapezoidal arced labyrinth weir
• ISSN: 0955-5986; 1873-6998
• DOI: 10.1016/j.flowmeasinst.2021.101946

Arced labyrinth weir is a certain type of nonlinear weirs with a very high discharge capacity. Thanks to the increased effective length and the ensuing increased discharge capacity of these weirs, they can be used in dam spillways and water regulating structures. This study focused on trapezoidal Arced labyrinth weirs (TALW) of widened middle cycle. Various experiments were performed to evaluate the effect on discharge coefficient of various geometric parameters, including the ratio of inside apex width of the end cycles to that of the middle cycle (w2/w1) and the ratio of the length of labyrinth weir (Apron) in flow direction to the width of the middle cycle (B/w1). Results of this study showed that with a decrease in w2/w1 from 0.42 to 0.30, discharge coefficient (Cd) would increase by 13–33%. •This study focused on trapezoidal Arced labyrinth weirs (TALW) of widened middle cycle.•The arced form in plan offers a higher discharge coefficient.•Various experiments were performed to evaluate the effect on discharge coefficient of various geometric parameters.