Critical Flow over Circular Crested Weirs |
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Authors: | O. Castro-Orgaz J. V. Giráldez J. L. Ayuso |
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Affiliation: | 1Dept. of Agronomy, Univ. of Cordoba, Apdo. 3048, 14080 Cordoba, Spain (corresponding author). E-mail: ag1gicej@uco.es 2Dept. of Agronomy, Univ. of Cordoba, Apdo. 3048, 14080 Cordoba, Spain; and, Dept. of Agronomy, IAS, CSIC, Apdo. 4084, 14080 Cordoba, Spain. 3Dept. of Agricultural Engineering, Univ. of Cordoba, Apdo. 3048, 14080 Cordoba, Spain.
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Abstract: | The critical flow principle is a useful approach for the hydraulic analysis of round-crested weirs due to their single head-discharge relationships. The hydraulics of circular-crested weirs is examined using simplified models incorporating streamline curvature effects, comparing their predictions with experimental data. A generalized one-dimensional model based on the critical flow in curvilinear motion has been developed. The discharge coefficient increases with the specific energy normalized with the radius of curvature, E/R, when streamline curvature effects are included. The relative flow depth at the crest decreases as E/R increases. The flow at the weir crest is only critical for a normalized specific energy value of E/R ≈ 0.5–0.6. For larger heads, the flow at the weir crest has been found to be supercritical. |
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Keywords: | Open channels Critical flow Weirs |
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