Distribution Channels

Hager, Willi H.; Volkart, Peter U.

doi:10.1061/(asce)0733-9429(1986)112:10(935)

Cited by 33 publications

(12 citation statements)

References 12 publications

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“…In other words, in the case of a low crest side weir in circular-shaped channels the theoretical approach suggests that there should be an increase in specific energy due to flow separation. A similar phenomenon was identified in the paper by Hager and Volkart [7], where the increase in specific energy of the flow in the channel along a side weir was theoretically hypothesised for the case in which the channel velocity V is greater than Ucosy. Analogous effects were also observed in conventional junctions where the increase in specific energy in the through-branch is associated with energy loss in the lateral [6J.…”

Section: Discussionsupporting

confidence: 74%

“…Moreover, in order to predict the energy loss due to the flow diversion, we will not take into account the friction losses. They are partially com pensated for by the bed slope and if they were to play a signifi cant role, they could be added to the losses due to the diversion [7]. However, the experimental data we will show later in this …”

Section: Specific Energy Lossmentioning

confidence: 98%

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Hydraulic features of supercritical flow along prismatic side weirs

Oliveto

Biggiero

Fiorentino

2001

Journal of Hydraulic Research

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Side weirs are key structures often located in combined sewer systems, provided the upstream flow is subcritical. At present, knowledge ot the outflow process when the flow along the weir is subcritical can be considered satisfactory. The same cannot be said when, as often happens in practice, the upstream flow is subcritical while the flow along the weir is supercritical. In this paper the local flow features along prismatic side weirs in a circular channel were investigated. In particular, the condition of supercritical flow along the weir was analysed. Based on experimental work and on data available in the literature, some characteristics of both the flow that remains in the main channel and the flow that leaves it were investigated. These include: the distribution of the discharge in the main channel, the lateral outflow angle and the lateral outflow velocity. The results combine to provide a better understanding of the outflow process and are also readily applicable for design. Finally, a theoretical global approach is presented to estimate the head loss due to the flow partition

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Section: Discussionsupporting

confidence: 74%

Section: Specific Energy Lossmentioning

confidence: 98%

Hydraulic features of supercritical flow along prismatic side weirs

Oliveto

Biggiero

Fiorentino

2001

Journal of Hydraulic Research

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“…For instance, a one-dimensional approach has been developed for side-weirs [6,7], but we suppose here that the breach has developed on the entire height of the dike, which results in a different behaviour (see Section 5). Moreover, both empirical formulae (e.g.…”

mentioning

confidence: 99%

Dike-break induced flows: a simplified model

et al. 2012

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A simplified model for the prediction of the steady-state outflow through a breach in an inland dike is presented. It consists in the application of the mass and momentum conservation principles to a macroscopic control volume. A proper definition of the shape of the control volume enables to take the main characteristics of the flow into account and thus to compensate for the extreme simplification of the spatial representation of the model. At the breach, a relation derived from the shallow-water equations is used to determine the direction of the flow. Developments have been guided by numerical simulations and results have been compared to experimental data. Both the accuracy and the domain of validity of the simplified model are found satisfactory.

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“…10) and S o the bottom slope and subscript 1 refers to the cross-section at the upstream weir corner. A modified channel geometry as created by a lateral constriction or a negative bottom slope favours the establishment of pseudo-uniform flow conditions (Hager and Volkart 1986). Since the deposit induces a similar effect, the slight drawdown of the water surface profile is damped and the flow depth h 1 in Eq.…”

Section: Maximum Height Of Extracted Deposit On Right Channel Bankmentioning

confidence: 99%

Semi-empirical model for channel bed evolution due to lateral discharge withdrawal

Rosier

Boillat

Schleiss

2010

Journal of Hydraulic Research

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Side weirs and overtopable levees are widely used to increase flood routing along a channel or river. The lateral loss of water reduces the sediment transport capacity leading to the formation of a local sediment deposit close to the overflow. Since the extent of the morphological bed changes is not known a priori, the design discharge is increased by this flow -sediment transport interaction in an uncontrolled way. Based on a systematic flume study, a semi-empirical model to predict the three-dimensional bed evolution of the aggraded channel reach in the vicinity of the overflow is developed. The shape of the deposit is modelled by an adapted Maxwell-type distribution function. The main input parameters of the model are expressed in terms of dimensionless parameters accounting for main channel and side overflow geometry as well as flow and sediment transport characteristics. The application of the empirical model in numerical flow calculations predicts 90% of the measured overflow.

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Distribution Channels

Cited by 33 publications

References 12 publications

Hydraulic features of supercritical flow along prismatic side weirs

Hydraulic features of supercritical flow along prismatic side weirs

Dike-break induced flows: a simplified model

Semi-empirical model for channel bed evolution due to lateral discharge withdrawal

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