Author(s): Mohammad Karimi Chahartaghi; Sohrab Nazari; Mohammad Mahmoodian Shooshtari

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Keywords: Central angle; curved plan; experimental models; hydraulic; parapet wall

Abstract: Piano key weirs (PKWs) are classified as broad-crested weirs offering a high hydraulic performance. In this experimental study, the hydraulic performance of PKWs (of curved plan-form) under different hydraulic and geometric conditions was studied. A total of 16 experimental models with four different arc radii (35, 49, 70 and 90 cm) and central angles (90°, 65°, 50°, 45°) with a parapet wall of 4.5 cm height were considered. The results showed that by increasing the angle of the curved plan-form, the hydraulic performance of the weir was further affected by the parapet wall. Moreover, the parapet wall increased the hydraulic performance by 10% at most. In addition, the arced PKW with a parapet wall increased the performance by 2.98 and 3.82 times compared to the arced sharp-crested weir and the linear sharp-crested weir, respectively.

DOI: https://doi.org/10.1080/00221686.2019.1573762

Year: 2020