Hydraulic Analysis of Pivot Side Weirs with Sill

Articles in Press

Document Type : Research Paper

Authors

Department of Hydraulic Structures, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

Abstract

The side weir is a widely used structure for the diversion of flow in channels and waterways. In this study, a new type of side weir, referred to as the pivot side weir (a type of inclined sharp-crested weir) with a sill, was introduced to investigate its discharge coefficient and efficiency. The experiments were conducted in the hydraulic laboratory of the Faculty of Water Engineering at Shahid Chamran University of Ahvaz. The performance of the models PSW (pivot side weir with a sill and open overflow sides), PSW-C (pivot side weir with closed overflow sides), and PSW-HC (pivot side weir with an open upstream side and closed downstream end) was evaluated against the control model R (rectangular sharp-crested side weir) in relation to the upstream Froude number ranging from 0.3 to 0.54, under a constant ratio of upstream depth to weir height and at opening angles of 30, 45, and 60 degrees towards the main channel. The results indicated that the models introduced in this study were more efficient than the control model, exhibiting higher discharge coefficients and efficiencies. Calculations showed that in the primary models, the discharge coefficient increased by up to 80% and efficiency by up to 70% compared to the control model. Furthermore, when comparing the primary models with each other, it was observed that the average discharge coefficient and efficiency of the PSW-HC model increased by approximately 7% and 5%, respectively, compared to the PSW model, and by 22% and 8% compared to the PSW-C model.

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Main Subjects

Iranian Journal of Soil and Water Research

Articles in Press, Accepted Manuscript
Available Online from 26 November 2024

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