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Gates are frequently used to control discharge in canals or over spillway crests. If the gate opening is unsubmerged the gate is a control and the relationship between discharge and the upstream flow depth is obtained by application of energy conservation. If the opening is submerged the discharge depends also on the submergence depth, which is related to the downstream flow depth through momentum conservation. Submergence is checked by comparing the momentum function values of the vena contracta depth and the downstream depth. A gate in a steep channel may exhibit hysteretic behaviour; whether or not it acts as a control at a particular opening depends on the preceding flow conditions.
Gates are frequently used to control discharge in canals or over spillway crests. If the gate opening is unsubmerged the gate is a control and the relationship between discharge and the upstream flow depth is obtained by application of energy conservation. If the opening is submerged the discharge depends also on the submergence depth, which is related to the downstream flow depth through momentum conservation. Submergence is checked by comparing the momentum function values of the vena contracta depth and the downstream depth. A gate in a steep channel may exhibit hysteretic behaviour; whether or not it acts as a control at a particular opening depends on the preceding flow conditions.
Underflow Gates
James, C S (author)
Hydraulic Structures ; Chapter: 2 ; 61-73
2019-12-20
13 pages
Article/Chapter (Book)
Electronic Resource
English
Underflow gates , Unsubmerged analysis , Submerged analysis , Vena contracta , Contraction coefficient , Hysteretic behaviour Engineering , Geoengineering, Foundations, Hydraulics , Building Construction and Design , Offshore Engineering , Mechanical Statics and Structures , Engineering Fluid Dynamics
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