Difference between revisions of "1D Weirs"
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Broad Crested weirs are commonly used to measure the discharge of rivers. | Broad Crested weirs are commonly used to measure the discharge of rivers. | ||
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The Crump Weir models a triangular profile weir with a 1:2 sloping front face and a 1:5 sloping back face. This type of weir are used as measuring structures within open channel. | The Crump Weir models a triangular profile weir with a 1:2 sloping front face and a 1:5 sloping back face. This type of weir are used as measuring structures within open channel. | ||
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| − | + | ;Ogee-crested weir | |
An ogee-crested weir is a special type of weir, generally used as a spillway of a dam as shown in figure. The crest of an ogee weir slightly rises up from the inside edge (i.e., a slight hump on top of the weir) and after reaching the maximum rise of 0.115 H (where H is the height of the water above the inside edge) falls in a parabolic form over the edge of the weir. | An ogee-crested weir is a special type of weir, generally used as a spillway of a dam as shown in figure. The crest of an ogee weir slightly rises up from the inside edge (i.e., a slight hump on top of the weir) and after reaching the maximum rise of 0.115 H (where H is the height of the water above the inside edge) falls in a parabolic form over the edge of the weir. | ||
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| − | + | ;Rectangular weir | |
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| − | + | ;Trapezoidal or Cippoletti weir | |
The "Cippoletti" weir is a trapezoidal shaped weir. The purpose of the slope, on the sides, is to obtain an increased discharge through the triangular portions of the weir, which otherwise would have been decreased due to end contractions in the case of rectangular weirs. | The "Cippoletti" weir is a trapezoidal shaped weir. The purpose of the slope, on the sides, is to obtain an increased discharge through the triangular portions of the weir, which otherwise would have been decreased due to end contractions in the case of rectangular weirs. | ||
[[File:Cippoletti_Weir.png|thumb|none|400px|http://www.codecogs.com/library/engineering/fluid_mechanics/weirs/discharge.php]] | [[File:Cippoletti_Weir.png|thumb|none|400px|http://www.codecogs.com/library/engineering/fluid_mechanics/weirs/discharge.php]] | ||
| − | + | ;V-notch weir | |
[[File:V-notch weir.jpg|none|400px|http://wintertracadie.ca/wp-content/uploads/2013/12/V-notch-weir-to-measure-spring-flow.jpg]] | [[File:V-notch weir.jpg|none|400px|http://wintertracadie.ca/wp-content/uploads/2013/12/V-notch-weir-to-measure-spring-flow.jpg]] | ||
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Revision as of 11:39, 22 July 2016
Page Under Construction
Introduction
A weir is a barrier across a designated flow path that is designed to alter flow characteristics. Most common weirs act as an obstruction, smaller but similar to a dam, that pools water behind it while allowing water to steadily flow over the top. Weirs within TUFLOW, like bridges, do not require data for length, Manning's n, divergence or bed slope so they are zero-length channels effectively.
Weir types that can be used within TUFLOW
- under construction
- Broad-crested weir
Broad Crested weirs are commonly used to measure the discharge of rivers.
- Crump weir
The Crump Weir models a triangular profile weir with a 1:2 sloping front face and a 1:5 sloping back face. This type of weir are used as measuring structures within open channel.
- Ogee-crested weir
An ogee-crested weir is a special type of weir, generally used as a spillway of a dam as shown in figure. The crest of an ogee weir slightly rises up from the inside edge (i.e., a slight hump on top of the weir) and after reaching the maximum rise of 0.115 H (where H is the height of the water above the inside edge) falls in a parabolic form over the edge of the weir.
- Rectangular weir
- Trapezoidal or Cippoletti weir
The "Cippoletti" weir is a trapezoidal shaped weir. The purpose of the slope, on the sides, is to obtain an increased discharge through the triangular portions of the weir, which otherwise would have been decreased due to end contractions in the case of rectangular weirs.
- V-notch weir
- Spillway
Bath, UK (pht: Rohan King)
Irregular shaped weirs
- under construction
Operational Control
- under construction
Typical check files used
- under construction
Any further questions please email TUFLOW support: support@tuflow.com
Back to 1D Hydraulic Structures