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Título: | Critical depth relationships in developing open-channel flow |
Autor: | Castro-Orgaz, Óscar CSIC; Giráldez, Juan Vicente CSIC ORCID ; Ayuso, José Luis | Fecha de publicación: | mar-2010 | Editor: | American Society of Civil Engineers | Citación: | Journal of Hydraulic Engineering 136(3): 175-178 (2010) | Resumen: | Doubts have been expressed about the validity of the critical depth defined in terms of the minimum specific energy head of the free-surface streamline when dealing with developing open-channel flows. This note examines the two approaches for defining critical flow, that based on the minimum specific energy of the free-surface streamline and that based on the mean energy head of the whole flow section. Large differences for the dimensionless critical depths are obtained with the two methods due to each critical depth proving to be a different control point on the free-surface profile. It is argued that both methods are different alternatives, although the critical depth concept was different in each case. Theoretical support to critical flow computations based on the free streamline is provided. An alternative approach for computing the discharge characteristics of broad-crested weirs based on the energy loss inside the boundary layer is also proposed. © 2010 ASCE. | URI: | http://hdl.handle.net/10261/85066 | DOI: | 10.1061/(ASCE)HY.1943-7900.0000142 | Identificadores: | doi: 10.1061/(ASCE)HY.1943-7900.0000142 issn: 0733-9429 e-issn: 1943-7900 |
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