Mobile barrages and intakes on sediment transporting rivers

Bouvard, Maurice

doi:10.1201/9780203746950

Cited by 11 publications

(24 citation statements)

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“…The shape of the bars has also been analyzed to determine the amount of collected flow [1,5,14,19,20,[22][23][24].…”

Section: Krochin [21]mentioning

confidence: 99%

“…An intake system may be used to avoid the sedimentation problems. Examples can be found in regions such as the French Alps [1,3], the Tyrol for the TIWAG-Tiroler Wasserkraft AG company [4,5], the Caucasus for the Borjomi water company [6], and La Palma Island (Canary Islands, Spain) for the irrigation society of Heredamiento de las Haciendas de Argual y Tazacorte [7] shown in Figure 1. This paper is focused on the viability of using an intake system to ephemeral rivers in the semiarid region of the South East of Spain.…”

Section: Introductionmentioning

confidence: 99%

“…In some cases, there are debris flows that can reach volumetric concentrations of solids between 15%-30% in the presence of mud flows [1,2]. These regions make difficult the building of large dam-reservoir systems.…”

Section: Introductionmentioning

confidence: 99%

“…To avoid the obstruction of the racks, recommendations are based on prototype observations [1][2][3][4][5]:…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Study of Bottom Rack Occlusion by Flow with Gravel-Sized Sediment. Application to Ephemeral Streams in Semi-Arid Regions

Castillo

García

Carrillo

2016

Water

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Rainfall runoff collection in ephemeral streams is an objective in semi-arid zones. Rack intake systems are proposed to collect these flash floods with intensive sediment transport. The design parameters address the problem of clogging the spacing between bars. Experiments for two different void ratio racks are shown. Flows, longitudinal slopes in the rack, and water with three gravel-sized sediments were tested. Results such as effective void ratio due to the gravel deposition over the rack, the evolution of the flow rejected during each test, and the quantification of materials collected and deposited, are presented. The optimal longitudinal rack slope seems to be close to 30%. The effective void ratio is related to several hydraulic parameters calculated at the beginning of the rack. Some adjustments were proposed to predict the effective void ratio.

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“…The shape of the bars has also been analyzed to determine the amount of collected flow [1,5,14,19,20,[22][23][24].…”

Section: Krochin [21]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…To avoid the obstruction of the racks, recommendations are based on prototype observations [1][2][3][4][5]:…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental and Numerical Study of Bottom Rack Occlusion by Flow with Gravel-Sized Sediment. Application to Ephemeral Streams in Semi-Arid Regions

Castillo

García

Carrillo

2016

Water

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“…Nowadays, work is ongoing to study these intakes in order to derive flash floods from ephemeral rivers in semi-arid zones, not to control flooding but to collect runoff and improve the availability of resources. Several authors have proposed design recommendations to avoid rack occlusion from prototype observations in mountain rivers (e.g., Orth et al [1]; Ract-Madoux et al [2]; Krochin [3]; Drobir [4]; Bouvard [5]; Raudkivi [6]). Castillo et al [7], from experimental measurements in a flow with gravel-sized materials, found that a longitudinal rack slope around 30% minimizes the occlusion effect.…”

Section: Introductionmentioning

confidence: 99%

Influence of Rack Slope and Approaching Conditions in Bottom Intake Systems

Castillo¹,

García²,

Carrillo³

2017

Water

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Abstract:The study analyzes the flow over bottom racks made of longitudinal T-shaped bars. A clear water flow is considered in a laboratory flume. Free surface profiles, wetted rack lengths, and discharge coefficients are measured, changing parameters such as longitudinal slope, void ratio, and approaching flow. The present work complements existing experimental studies, considering the influence of the approaching flow conditions. The velocity field measured with Particle Image Velocimetry (PIV) technique and the pressure field with Pitot tubes are quantified. Numerical simulations (CFD) are used to complement laboratory data. The energy head along the rack is calculated and compared with the hypothesis of horizontal energy level with minimum energy at the beginning of the rack. A discharge coefficient adjustment that considers the slope, the void ratio, and the position along the rack is proposed and presented with the results of other works. Theoretical proposals to calculate the pressure field along the flow are compared with measurements in the laboratory. The relation between the static pressure head in the space of bars and the discharge coefficient is used as an alternative method to define the discharge.

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Effect of sediment deposition upstream of the New Ibrahimia Head Regulator on its flow characteristics

Mohamed

2018

Water Science

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The New Ibrahimia Head Regulator (NIHR) is equipped with double leaf gates and the flow is planned to be passing over these gates. Sediment deposition is likely to occur upstream of the gates due to the reduction in the flow velocity in the zone of back water curve. This research aims at studying the effect of sedimentation on the flow characteristics of the NIHR. Physical modeling and regression analysis were employed to conduct this research. The sedimentation depth was taken as 25%, 50%, 75%, and 100% of the gate height. A length of 10%, 20%, 30%, 40%, and 50% of the distance between the existing and the New Ibrahimia Head Regulator was employed. The discharge coefficient increases with the increase of the sedimentation. A new stage-discharge relationship was developed in case of sediment and no sediment. A larger physical model is recommended to study the effect of upstream sediment on the downstream hydraulic jump.

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Mobile barrages and intakes on sediment transporting rivers

Cited by 11 publications

References 0 publications

Experimental and Numerical Study of Bottom Rack Occlusion by Flow with Gravel-Sized Sediment. Application to Ephemeral Streams in Semi-Arid Regions

Experimental and Numerical Study of Bottom Rack Occlusion by Flow with Gravel-Sized Sediment. Application to Ephemeral Streams in Semi-Arid Regions

Influence of Rack Slope and Approaching Conditions in Bottom Intake Systems

Effect of sediment deposition upstream of the New Ibrahimia Head Regulator on its flow characteristics

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