Applicability of the De Marchi Hypothesis for Side Weir Flow in the Case of Movable Beds

Paris, Enio; Solari, Luca; Bechi, G.

doi:10.1061/(asce)hy.1943-7900.0000566

Cited by 15 publications

(13 citation statements)

References 7 publications

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“…The step appeared to influence the performance of the weir, so that the percentage of spilled discharge increased with its height. Paris et al (2012) verified the applicability of the De Marchi hypothesis (i.e., constant total head along the weir) for a movable bed based on their experimental data in subcritical flow conditions. These are here extended and analyzed to describe two features related to the interactions between bed mobility and lateral flow: (1) the increase of the spilled water discharge induced by bed deformations in the proximity of the side weir, and (2) the estimate of sediment transport leaving the main channel over the side weir sill.…”

Section: Introductionsupporting

confidence: 63%

“…The main hypothesis at the base of the work is the validity of the De Marchi hypothesis in movable bed conditions, which was verified by Paris et al (2012) for Froude numbers (F) up to 0.65. This constitutes a limitation of the theoretical framework.…”

Section: Theoretical Frameworkmentioning

confidence: 85%

“…Following Paris et al (2012), the De Marchi hypothesis preserves its validity even in movable bed conditions up to F ¼ 0.65 downstream of the side weir. Accordingly, the total head along the entire weir length is assumed to be constant…”

Section: Effects Of Bed Mobility On Spilled Dischargementioning

confidence: 92%

“…(1), have been assumed to be equal to the unity. The difference in the mean bed elevation between Cross Sections 1 and 2 is (Paris et al 2012)…”

Section: Effects Of Bed Mobility On Spilled Dischargementioning

confidence: 99%

“…Catella et al (2007) analyzed the effects of bed mobility on side weir efficiency by using a river morphodynamic model. The experiments of Paris et al (2012) using a laboratory flume with movable bed in subcritical flow conditions suggested that side weirs may affect bed morphology. These data showed bed deformation as a positive step in the reach facing the weir due to (1) sediment deposition at the downstream end of the weir induced by the reduction of discharge in the main channel, and (2) erosion at the upstream end of the weir driven by flow acceleration.…”

Section: Introductionmentioning

confidence: 99%

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Side Weir Flow on a Movable Bed

et al. 2016

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Side weirs are hydraulic structures widely used for flow control in rivers and canals. Whenever the water level rises above the side weir crest elevation, a fraction of the main flow is diverted so that the water discharge flowing downstream in the main channel is reduced. In movable bed channels, the lateral outflow may have significant interactions with the sediment transport processes affecting the side weir flow. The spilled discharge creates a reduction of the downstream sediment transport capacity with a consequent deposition in the side weir proximity. In addition, sediment in the main channel can be diverted into the lateral branch. To investigate these interactions, experimental data at the laboratory scale have been collected and analyzed. The increase of the spilled discharge induced by the local sediment deposition is described according to the classical De Marchi hypothesis. Furthermore, the sediment transport leaving the main channel through the lateral structure is modeled in terms of the stream power associated with the bed-shear stress. Results allow for prediction of the bed dynamics and for the development of new design criteria.

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Section: Introductionsupporting

confidence: 63%

Section: Theoretical Frameworkmentioning

confidence: 85%

Section: Effects Of Bed Mobility On Spilled Dischargementioning

confidence: 92%

“…(1), have been assumed to be equal to the unity. The difference in the mean bed elevation between Cross Sections 1 and 2 is (Paris et al 2012)…”

Section: Effects Of Bed Mobility On Spilled Dischargementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Side Weir Flow on a Movable Bed

et al. 2016

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Discharge coefficient of rectangular sharp-crested side weirs Part II: Domínguez's method

Bagheri

Kabiri-Samani

Heidarpour

2014

Flow Measurement and Instrumentation

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Diversion of Flow and Sediment Toward a Side Channel Separated From a River by a Longitudinal Training Dam

Ruijsscher

Vermeulen

Hoitink

2020

Water Resources Research

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A human-made entrance to a side channel separated from the river by a longitudinal training dam can be considered a new, emergent type of river bifurcation. To understand the processes controlling the diversion of flow and sediment toward the side channel at such bifurcations, a comprehensive field monitoring program was performed in the Waal River, which is the main branch of the Rhine River in the Netherlands. Local processes govern the flow field in the bifurcation region. The angle between the main river flow and the flow into the side channel increases with decreasing lateral and longitudinal distance to the bifurcation point, which corresponds to the head of the training dam. The general flow pattern can be well reproduced with a uniform depth, potential flow model consisting of a superposition of main channel flow and lateral outflow. For submerged flow conditions over the sill, the side channel hydraulic conditions influence the exchange processes, yet free flow side weir theory describes the flow field at this bifurcation type qualitatively well. The vertical flow structure in the side channel, which governs the sediment exchange between the main channel and the side channel, is steered by the geometrical details of the sill. The presence of the sill structure is key to controlling the morphological stability of this type of bifurcation given its primary influence on bed load sediment import and exerts an indirect impact on suspended sediment exchange.

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Applicability of the De Marchi Hypothesis for Side Weir Flow in the Case of Movable Beds

Cited by 15 publications

References 7 publications

Side Weir Flow on a Movable Bed

Side Weir Flow on a Movable Bed

Discharge coefficient of rectangular sharp-crested side weirs Part II: Domínguez's method

Diversion of Flow and Sediment Toward a Side Channel Separated From a River by a Longitudinal Training Dam

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