Drivers for mass and momentum exchange between the main channel and river bank lateral cavities

Ouro, Pablo; Juez, Carmelo; Franca, Mário J.

doi:10.1016/j.advwatres.2020.103511

Cited by 24 publications

(18 citation statements)

References 53 publications

(81 reference statements)

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“…This mixing layer is characterized by the advection of quasiperiodic, large-scale vortices [10,12,13] that are shed from the upstream corner of the interface. Their impingement [3,14] on the downstream corner of the interface excites local free-surface oscillations and an intermittent inflow toward the cavity [6,9].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of bidirectional seiching in an open-channel, lateral cavity in the time and frequency domain

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Experimental study of bidirectional seiching in an open-channel, lateral cavity in the time and frequency domain

et al. 2020

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“…In addition, the fixed free surface condition will prevent flow to have interactions with a real free surface (Ouro et al 2020). This will mean that the seiching will not be present and that the vortex detachments interacting with the free surface will not exist (Chetibi et al 2019).…”

Section: Initial and Boundary Conditionsmentioning

confidence: 99%

Large Eddy Simulation for flows through emerged or slightly submerged square obstacles

et al. 2020

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…The average exchange coefficient, e, in this zone was 0.2 in case of impermeable spur, while it was 0.08 in case of slit type one, indicates weaker turbulence coherent structure in silt type spur. By performing large eddy simulation (LES) in case of river bank lateral cavities, it was concluded [64] that in transverse direction, pressure gradient contributes largely to flushing momentum out of the cavities (embayment in this case) while Reynolds normal stress and convection are responsible for its entraining into the cavity. Figure 20 shows a similar agreement of the higher-pressure gradient in case of slit type spur.…”

Section: Application Of Slit-type Spurs In the Brahmaputra-jamuna Rivermentioning

confidence: 99%

Three-Dimensional Flow Characteristics in Slit-Type Permeable Spur Dike Fields: Efficacy in Riverbank Protection

Shampa

Hasegawa

Nakagawa

et al. 2020

Water

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This paper focuses on finding efficient solutions for the design of a highly permeable pile spur (or slit type) dike field used in morphologically dynamic alluvial rivers. To test the suitability of different arrangements of this type of permeable pile spur dike field, laboratory experiments were conducted, and a three-dimensional multiphase numerical model was developed and applied, based on the experimental conditions. Three different angles to the approach flow and two types of individual pile position arrangements were tested. The results show that by using a series of slit-type spurs, the approach velocity of the flow can be considerably reduced within the spur dike zone. Using different sets of angles and installation positions, this type of permeable spur dike can be used more efficiently than traditional dikes. Notably, this type of spur dike can reduce the longitudinal velocity, turbulence intensity, and bed shear stress in the near-bank area. Additionally, the deflection of the permeable spur produces more transverse flow to the opposite bank. Arranging the piles in staggered grid positions among different spurs in a spur dike field improves functionality in terms of creating a quasi-uniform turbulence zone while simultaneously reducing the bed shear stress. Finally, the efficacy of the slit-type permeable spur dike field as a solution to the riverbank erosion problem is numerically tested in a reach of a braided river, the Brahmaputra–Jamuna River, and a comparison is made with a conventional spur dike field. The results indicate that the proposed structure ensures the smooth passing of flow compared with that for the conventional impermeable spur structure by producing a lower level of scouring (low bed shear stress) and flow intensification.

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Drivers for mass and momentum exchange between the main channel and river bank lateral cavities

Abstract: 2020. Drivers for mass and momentum exchange between the main channel and river bank lateral cavities.

Cited by 24 publications

References 53 publications

Experimental study of bidirectional seiching in an open-channel, lateral cavity in the time and frequency domain

Experimental study of bidirectional seiching in an open-channel, lateral cavity in the time and frequency domain

Large Eddy Simulation for flows through emerged or slightly submerged square obstacles

Three-Dimensional Flow Characteristics in Slit-Type Permeable Spur Dike Fields: Efficacy in Riverbank Protection

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