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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