Waves plus currents crossing at a right angle: Experimental investigation

Musumeci, Rosaria Ester; Cavallaro, Luca; Foti, Enrico; Scandura, Pietro; Blondeaux, Paolo

doi:10.1029/2005jc002933

Cited by 41 publications

(41 citation statements)

References 20 publications

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“…More- over, as pointed out by Musumeci et al [2006] thanks to some qualitative measurements performed in the upper part of the water column by means of a micropropeller, the conservation of mass principle is not violated, since a correspondent decrease of the velocity takes place thus balancing the acceleration in the lower part.…”

Section: Velocity Profilesmentioning

confidence: 96%

“…[96] A comparison with Musumeci et al [2006] has been performed. In order to make an easier comparison tests no.…”

Section: Discussionmentioning

confidence: 99%

“…The experimental setup, sketched in Figure 1 has been described in detail by Musumeci et al [2006]. It is made up of two interacting systems: a flume for the wave generation and propagation and a recirculating apparatus, which allows a uniform current interacting with the waves at a right angle to be generated.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…[23] Musumeci et al [2006] in the same experimental apparatus, focused on the determination of a measurement area where both the current and the wave characteristics can be considered spatially uniform. The velocity profiles of the present campaign are gathered within such an area, i.e., 2.5 m away from the inlet and 1 m onshore with respect to the axis of the current direction, i.e., where the flow can be considered homogeneous.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…[7] Recently, Musumeci et al [2006], performing experiments in a wave plus current environment, found that the effect of adding orthogonal waves to the current causes an increase of the current velocities close to the bottom, with respect to the case of current only when the bottom roughness is small, i.e., in the presence of a laminar boundary layer, on the other hand, when a large bottom roughness is present and the boundary layer is turbulent, the waves force a decrease of the current velocities close to the bottom.…”

Section: Introductionmentioning

confidence: 99%

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Waves plus currents at a right angle: The rippled bed case

2008

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[1] The present paper deals with wave plus current flow over a fixed rippled bed. More precisely, modifications of the current profiles due to the superimposition of orthogonal cylindrical waves have been investigated experimentally. Since the experimental setup permitted only the wave dominated regime to be investigated (i.e., the regime where orbital velocity is larger than current velocity), also a numerical k-e turbulence closure model has been developed in order to study a wider range of parameters, thus including the current dominated regime (i.e., where current velocity is larger than wave orbital one). In both cases a different response with respect to the flat bed case has been found. Indeed, in the flat bed case laminar wave boundary layers in a wave dominated regime induce a decrease in bottom shear stresses, while the presence of a rippled bed behaves as a macroroughness, which causes the wave boundary layer to become turbulent and therefore the current velocity near the bottom to be smaller than the one in the case of current only, with a consequent increase in the current bottom roughness.

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Section: Velocity Profilesmentioning

confidence: 96%

“…[96] A comparison with Musumeci et al [2006] has been performed. In order to make an easier comparison tests no.…”

Section: Discussionmentioning

confidence: 99%

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Waves plus currents at a right angle: The rippled bed case

2008

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On the wave and current interaction with a rippled seabed in the coastal ocean bottom boundary layer

Nayak

Kiani

et al. 2015

J. Geophys. Res. Oceans

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Interactions of currents and waves with a rippled seabed in the inner part of the coastal ocean bottom boundary layer are studied using particle image velocimetry, ADV, and bottom roughness measurements. Mean velocity profiles collapse with appropriate scaling in the log layer, but vary substantially in the roughness sublayer. When wave-induced motions are similar or greater than the mean current, the hydrodynamic roughness (z 0 ) determined from velocity profiles is substantially larger than directly measured values. The roughness signature in turbulent energy spectra persists with elevation when its scale falls in the dissipation range, but decays in the log layer for larger roughness elements. Reynolds shear stress profiles peak in the lower parts of the log layer, diminishing below it, and gradually decaying at higher elevations. In contrast, wave shear stresses are negligible within the log layer, but become significant within the roughness sublayer. This phenomenon is caused by an increase in the magnitude and phase lag of the vertical component of wave-induced motion. No single boundary layer length scale collapses the Reynolds stresses, but both the Prandtl mixing length and eddy viscosity profiles agree well with the classical model of linear increase with elevation, especially near the seabed. Within the log region, profiles of shear production and dissipation rates of turbulence converge. Below it, dissipation rapidly increases, peaking near the seabed. Conversely, the shear production decays near the seabed, in agreement with the eddy viscosity model, but in contrast to both laboratory and computational rough wall studies.

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Interaction between waves and gravity currents: description of turbulence in a simple numerical model

2017

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Effects of surface waves on gravity current propagation are studied by means of a numerical model. The adopted modeling approach couples a Boussinesqtype of model for surface waves and a gravity current model for stratified flows. In particular two different turbulence closure models are introduced which take into account subgrid turbulence and an additional depth-constant eddy-viscosity. The turbulence parameters are calibrated by means of experimental data on the time evolution of the heavy front, obtained both in the absence and in the presence of regular surface waves. Velocity fields, heavy and light front position, shear stresses, vorticity and entrainment calculated by the model are analyzed. The turbulence closure which includes both uniform and Smagorinsky type eddy viscosity allows a better description of the actual gravity current propaga

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Waves plus currents crossing at a right angle: Experimental investigation

Cited by 41 publications

References 20 publications

Waves plus currents at a right angle: The rippled bed case

Waves plus currents at a right angle: The rippled bed case

On the wave and current interaction with a rippled seabed in the coastal ocean bottom boundary layer

Interaction between waves and gravity currents: description of turbulence in a simple numerical model

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