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Investigation of Quarter-Circular Crested Spillway Using Experiments and Convex Streamline Theory

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Abstract

The spillways are mainly used for flood releases from dam reservoirs and flow diversion from rivers. The quarter-circular crested spillway is the new shape of spillways. The upstream quadrant of this spillway consisted of a quarter-circular arc, and its downstream surface profile is matched on lower nappe profile of free jet over the quarter-circular crested weir. The present study aims to formulate the geometry and discharge properties of quarter-circular crested spillway. To these ends, experiments were conducted on eleven models of quarter-circular crested weir and the crest radius, downstream surface profile and design head of the quarter-circular crested spillway were formulated using experimentally measured data. Applying the convex streamline theory, the discharge coefficient and crest section velocity profile of the quarter-circular crested spillway at design head were also formulated. Results indicated good agreement between theoretically obtained equations and the experimentally measured data. Additionally, discharge coefficient of quarter-circular crested spillway is obtained equal to that of the classical ogee spillway. Surface body area, and consequently structural weight of quarter-circular crested spillway, is about 18% greater than that of classical ogee spillway, contributing more structural stability of quarter-circular crested spillway. Practically, quarter-circular crested spillway can be used as a suitable alternative instead of sloping the upstream face of the classical ogee spillway for structural stability.

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Authors and Affiliations

  1. Department of Water Engineering, College of Agriculture, Shiraz University, 7144165186, Shiraz, Iran

    Abbas Hoseini & Jahanshir Mohammadzadeh-Habili

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  1. Abbas Hoseini
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  2. Jahanshir Mohammadzadeh-Habili
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Correspondence to Jahanshir Mohammadzadeh-Habili.

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Hoseini, A., Mohammadzadeh-Habili, J. Investigation of Quarter-Circular Crested Spillway Using Experiments and Convex Streamline Theory. Iran J Sci Technol Trans Civ Eng 46, 1491–1501 (2022). https://doi.org/10.1007/s40996-021-00695-8

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  • DOI: https://doi.org/10.1007/s40996-021-00695-8

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