Waves and Currents at a River Mouth: The Role of Macrovortices, Sub-Grid Turbulence and Seabed Friction

Melito, Lorenzo; Postacchini, Matteo; Darvini, Giovanna; Brocchini, Maurizio

doi:10.3390/w10050550

Cited by 7 publications

(7 citation statements)

References 52 publications

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“…A different approach was followed in Reference [36], where a turbulent jet current interacting with frontal waves was investigated by means of a 2DH non-linear model based on shallow water equations. A 2DH non-linear shallow water model was also used in Reference [37] to investigate the effects of turbulence and seabed friction on macrovortices generated at a river mouth.…”

Section: Wave-current Interactionmentioning

confidence: 99%

Numerical Modelling of a Mussel Line System by Means of Lumped-Mass Approach

Pribadi¹,

Donatini²,

Lataire³

2019

JMSE

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This paper describes a numerical model to simulate the behavior of a mussel longline system, subjected to environmental loads such as waves and current. The mussel line system consists of an anchor, a mooring chain, a long backbone line, mussel collector lines and buoys. The lumped-mass open-source code MoorDyn is modified for the current application. Waves are modelled as a directional spectrum, and the current as a homogeneous velocity field with an exponential vertical distribution. A Coulomb model is implemented to model the horizontal friction between nodes and the seabed. Cylindrical buoys with three translational degrees-of-freedom are modelled by extending the simplified hydrodynamic model in use for line’s internal nodes with additional properties like cylinder height, diameter and mass. Clump weights are modelled in a similar way. For validation purposes, the results of the present software are compared with the commercially available lumped-mass based mooring dynamic software, OrcaFlex.

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Section: Wave-current Interactionmentioning

confidence: 99%

Numerical Modelling of a Mussel Line System by Means of Lumped-Mass Approach

Pribadi¹,

Donatini²,

Lataire³

2019

JMSE

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“…In the attempt to better describe the dynamics forced by the sea waves, Melito et al . () run the same cases studied by Olabarrieta et al . () using the intra‐wave NSWE model of Brocchini et al .…”

Section: Wave Forced‐dynamics For Three Fundamental Subsystems: Sandbmentioning

confidence: 89%

“…The differential breaking that generates macrovortices is particularly intense at river mouths characterized by seabed shoals. Hence, macrovortices, beyond the river jet expansion, provide a significant contribution to both flow mixing and sediment transport at river mouths (Melito et al, 2018b).…”

Section: Discussionmentioning

confidence: 99%

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Wave‐forced dynamics in the nearshore river mouths, and swash zones

Brocchini

2019

Earth Surf Processes Landf

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The role of wave forcing on the main hydro-morphological dynamics evolving in the shallow waters of the nearshore and at river mouths is analyzed. Focus is mainly on the cross-shore dynamics that evolve over mildly sloping barred, dissipative sandy beaches from the storm up to the yearly time scale, at most. Local and nonlocal mechanisms as well as connections across three main interrelated subsystems of the nearshore-the region of generation and evolution of nearshore bars, river mouths and the swash zoneare analyzed. The beach slope is a major controlling parameter for all nearshore dynamics. A local mechanism that must be properly described for a suitable representation of wave-forced dynamics of all such three subsystems is the proper correlation between orbital velocity and sediment concentration in the bottom boundary layer; while specific dynamics are the wave-current interaction and bar generation at river mouths and the sediment presuspension at the swash zone. Fundamental nonlocal mechanisms are both Infragravity (IG) waves and large-scale horizontal vortices (i.e. with vertical axes), both influencing the hydrodynamics, the sediment transport and the seabed morphology across the whole nearshore. Major connections across the three subsystems are the upriver This article is protected by copyright. All rights reserved. This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/esp.4699 propagation of IG waves generated by breaking sea waves and swash-swash interactions, the interplay between the swash zone and along-river-flank sediment transport and the evolution of nearshore sand bars.

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“…Not least, the contents of the papers serve to highlight key priority areas, knowledge gaps, and growth points in research activity in river, coastal, estuarine, and near-shore environments. The 15 papers contained within the Special Issue reflect the range of problems where new high quality data from laboratory and CFD (Computational Fluid Dynamics) modelling studies, and field measurements aid the interpretation of classical flow features in complex flows in: (1) Open channels, river mouths and river canyons [1][2][3][4][5][6][7][8]; (2) breaking waves and wave-current interactions in coastal zones [9][10][11][12][13][14]; and (3) gravity currents in natural channels [15]. Most significantly, the papers provide examples of where emerging problems associated with the disposal of dense brine into the aquatic environment are being tackled by detailed measurements of the turbulence properties of the flows.…”

Section: Introduction To the Special Issuementioning

confidence: 99%

Turbulence in River and Maritime Hydraulics

Mossa

Termini

Davies

2018

Water

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Understanding of the role of turbulence in controlling transport processes is of paramount importance for the preservation and protection of aquatic ecosystems, the minimisation of deleterious consequences of anthropogenic activity, and the successful sustainable development of river and maritime areas. In this context, the present Special Issue collects 15 papers which provide a representation of the present understanding of turbulent processes and their effects in river and maritime environments. The presented collection of papers is not exhaustive but it allows for highlighting key priority areas and knowledge gaps in this field of research.

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Waves and Currents at a River Mouth: The Role of Macrovortices, Sub-Grid Turbulence and Seabed Friction

Cited by 7 publications

References 52 publications

Numerical Modelling of a Mussel Line System by Means of Lumped-Mass Approach

Numerical Modelling of a Mussel Line System by Means of Lumped-Mass Approach

Wave‐forced dynamics in the nearshore river mouths, and swash zones

Turbulence in River and Maritime Hydraulics

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