Hydraulic Control Structures

2003 ◽  
pp. 253-280
Keyword(s):  
Hydraulic Control ◽  
Control Structures

Erosion of unconsolidated gravel beds

1985 ◽  
Vol 12 (3) ◽  
pp. 559-566 ◽  
Author(s):  
S. P. Chee ◽  
E. M. Yuen
Keyword(s):  
Analytical Study ◽  
Local Scour ◽  
Hydraulic Control ◽  
Control Structures ◽  
Gravel Beds ◽  
Water Jets ◽  
River Bed ◽  
Motion Condition ◽  
Scour Hole ◽  
Tail Water

In any riverbed degradation phenomenon, the vertical dimension of the deepest part of the scour hole is a pertinent parameter since all the other erosion parameters describing the configuration of the scour hole depend on its numerical value. Hence, it is necessary to be able to evaluate the maximum depth of the scour hole.For most practical situations, the impingement of submerged water jets on a granular riverbed occurs at an angle, and it is the object of this study to include the effects of obliqueness in the analysis. Some examples of the effects of impingement by water jets are the erosion problems caused by plunging water jets from hydraulic control structures as they discharge into the tail-water downstream.Basic to an understanding of the mechanism of local scour is the concept of "initiation of motion." Hence, the analytical study will use this concept to derive generalized relations that will link the incipient motion condition at the deepest point of the scour hole with the numerical value of the scoured depth. In addition, care was taken to ensure that only those hydraulic variables that are frequently used in hydraulic engineering design are included in the analysis in order to make the results useful to practicing engineers. Key words: local scour, maximum erosion, river bed, plunge basin, diving jets, energy dissipation, riverbed degradation.

scholarly journals Adaptive control of algae detachment in regulated canal networks

2013 ◽  
Vol 15 (2) ◽  
pp. 321-334 ◽  
Author(s):  
Ophélie Fovet ◽  
Xavier Litrico ◽  
Gilles Belaud ◽  
Olivier Genthon
Keyword(s):  
Adaptive Control ◽  
Adaptive Controller ◽  
Distribution Networks ◽  
Hydraulic Control ◽  
Flow Meters ◽  
Control Structures ◽  
Canal Network ◽  
Canal Networks ◽  
Hydraulic Shear ◽  
Hydraulic Devices

Open-channel distribution networks are subject to algal developments that can induce major disturbances such as clogging of hydraulic devices (pipes, weirs, filters, flow meters). Flushes can be used as a strategy to manage these algae developments. A flush is carried out by increasing the hydraulic shear conditions using hydraulic control structures of the canal network. In response to the shear stress increase, a part of the fixed algae is detached, then re-suspended into the water column, and finally transported downstream. This leads to a peak of turbidity that has to be controlled. In this paper, we develop a distributed linear model of the turbidity dynamics that is used for real-time adaptive control of the flushes. Simulations show the effectiveness of the adaptive controller, which can, at the same time, estimate the gain of the system, linked to the amount of initial fixed biomass, and perform a flush without exceeding the turbidity limit.

scholarly journals Determination of position of hydraulic jump in a flume by using CFD and comparison with experiential results https://doi.org/10.21698/rjeec.2020.211 P

2020 ◽  
Vol 2 (2) ◽  
pp. 78-85
Author(s):  
Ali Yildiz ◽  
◽  
Ali Ihsan Marti ◽  
Alpaslan Yarar ◽  
Volkan Yilmaz
Keyword(s):  
Numerical Model ◽  
Hydraulic Jump ◽  
Human Life ◽  
Hydraulic Control ◽  
Sluice Gate ◽  
Channel System ◽  
Control Structures ◽  
Before And After ◽  
And Control

Dams and hydraulic structures are used for the supply and control of water, which have great importance on human life. The sluice gate is one of the hydraulic control structures. Sluice gates release excess water from the reservoir to the downstream side in a controlled manner with a certain discharge for controlling the level of the reservoir. A hydraulic jump is created to dissipate the energy of flow coming from under the gates. A hydraulic jump occurs when the flow regime is changed from subcritical to supercritical. However, the position of the hydraulic jump in the channel should be known exactly to prevent damage to surrounding structures. In this study, an open channel system with a sluice gate is used to produce a hydraulic jump. Experiments are conducted for two different gate openings (a1=1.5 cm and a2=2 cm) and 16 discharge values. For each case, the position of the hydraulic jump is determined. In addition, flow depths at 5 different points were measured including before and after the hydraulic jump. The results obtained from the experimental study were compared with the numerical model in terms of the position of hydraulic jump and flow depths. According to the results obtained, the numerical model and the physical model showed between 80 and 91% consistency.

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