Wave–Current Interaction: A Comparison of Radiation-Stress and Vortex-Force Representations

Lane, Emily M.; Restrepo, Juan M.; McWilliams, James C.

doi:10.1175/jpo3043.1

Cited by 97 publications

(77 citation statements)

References 28 publications

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“…Bennis and Ardhuin (2011) questioned the method of Mellor and suggested the use of Lagrangian mean framework leading to the so-called vortex force. Vortex force method has been implemented in ROMS-SWAN (Kumar et al, 2012;Lane et al, 2007;McWilliams et al, 2004;Uchiyama et al, 2010). Moghimi et al (2013) critically compared the two approaches claiming that the radiation stress formulation showed unrealistic offshore directed transport in the wave shoaling regions; on the other hand the results of longshore circulations performed similarly for both methods.…”

Section: Introductionmentioning

confidence: 99%

Coupling of wave and circulation models in coastal–ocean predicting systems: a case study for the German Bight

Staneva¹,

Wahle²,

Günther³

et al. 2016

Ocean Sci.

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Abstract. This study addresses the impact of coupling between wave and circulation models on the quality of coastal ocean predicting systems. This is exemplified for the German Bight and its coastal area known as the Wadden Sea. The latter is the area between the barrier islands and the coast. This topic reflects the increased interest in operational oceanography to reduce prediction errors of state estimates at coastal scales, which in many cases are due to unresolved non-linear feedback between strong currents and wind waves. In this study we present analysis of wave and hydrographic observations, as well as results of numerical simulations. A nestedgrid modelling system is used to produce reliable nowcasts and short-term forecasts of ocean state variables, including waves and hydrodynamics. The database includes ADCP observations and continuous measurements from data stations. The individual and combined effects of wind, waves and tidal forcing are quantified. The performance of the forecast system is illustrated for the cases of several extreme events. The combined role of wave effects on coastal circulation and sea level are investigated by considering the wavedependent stress and wave breaking parameterization. Also the response, which the circulation exerts on the waves, is tested for the coastal areas. The improved skill of the coupled forecasts compared to the non-coupled ones, in particular during extreme events, justifies the further enhancements of coastal operational systems by including wave effects in circulation models.

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Section: Introductionmentioning

confidence: 99%

Coupling of wave and circulation models in coastal–ocean predicting systems: a case study for the German Bight

Staneva¹,

Wahle²,

Günther³

et al. 2016

Ocean Sci.

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“…Some of these have been further adapted into existing ocean numerical models and applied to reproduce observed circulations [e.g., Uchiyama et al, 2009] and nearshore dispersion [e.g., Reniers et al, 2009]. The main distinctions between the different formulations are (1) the use of an Eulerian or Lagrangian point of view and (2) the separation or not of the momentum into wave and mean flow contributions [Lane et al, 2007;Bennis et al, 2011]. For the first aspect, truly Eulerian approach requires a mathematical extrapolation of the velocity profile from the trough level to the mean sea level in order to define the mean flow in the crest-to-trough region [Mc Williams et al, 2004].…”

Section: Introductionmentioning

confidence: 99%

Effects of waves on coastal water dispersion in a small estuarine bay

et al. 2014

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[1] A three-dimensional wave-current model is used to investigate wave-induced circulations in a small estuarine bay and its impact on freshwater exchanges with the inner shelf, related to stratified river plume dispersion. Modeled salinity fields exhibit a lower salinity surface layer due to river outflows, with typical depth of 1 m inside the bay. The asymmetric wave forcing on the bay circulation, related to the local bathymetry, significantly impacts the river plumes. It is found that the transport initiated in the surf zone by the longshore current can oppose and thus reduce the primary outflow of freshwater through the bay inlets. Using the model to examine a high river runoff event occurring during a high-energy wave episode, waves are found to induce a 24 h delay in freshwater evacuation. At the end of the runoff event, waves have reduced the freshwater flux to the ocean by a factor 5, and the total freshwater volume inside the bay is increased by 40%. According to the model, and for this event, the effect of the surf zone current on the bay flushing is larger than that of the wind. The freshwater balance is sensitive to incident wave conditions. Maximum freshwater retention is found for intermediate offshore wave heights 1 m < H s < 2 m. For higher-energy waves, the increase in the longshore current reduces the retention, which is two times lower for H s 5 4 m than for H s 5 2 m.

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“…We make use of the CoupledOcean-Atmosphere-Wave-Sediment Transport (COAWST) Modeling System described by Warner et al (2010), which provides online, two-way coupling between ROMS, SWAN, and Weather Regional Forecast (WRF) models through the Model Coupling Toolkit (MCT). We implemented the coupled ROMS-SWAN simulations for the south shore of Honolulu, Hawaii, using a vortex force formalism to account for the wave-current interaction described by Uchiyama et al (2010) and Kumar et al (2012), which gives better performance than the traditional (Mellor, 2005(Mellor, , 2008) radiation stress approach (Lane et al, 2007). All simulations use the Mellor and Yamada (1982) turbulence closure model to account for the vertical mixing.…”

Section: The Roms Modelmentioning

confidence: 99%

“…This is particularly important for the wave-induced mixing and the surf zone circulation. Lane et al (2007) and Uchiyama et al (2010) showed that the radiation stress approach used in the Delft3D system does not properly decompose the wave effects, and it obscures their underlying impact on the long (infragravity) waves and currents. From the point of view of the wave field, Edwards et al (2009) show the Delft3D system tends to underestimate the wave height.…”

Section: Introductionmentioning

confidence: 99%

Different approaches to model the nearshore circulation in the south shore of O'ahu, Hawaii

Souza

Powell

2017

Ocean Sci.

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Abstract. The dynamical interaction between currents, bathymetry, waves, and estuarine outflow has significant impacts on the surf zone. We investigate the impacts of two strategies to include the effect of surface gravity waves on an ocean circulation model of the south shore of O'ahu, Hawaii. This area provides an ideal laboratory for the development of nearshore circulation modeling systems for reef-protected coastlines. We use two numerical models for circulation and waves: Regional Ocean Modeling System (ROMS) and Simulating Waves Nearshore (SWAN) model, respectively. The circulation model is nested within larger-scale models that capture the tidal, regional, and wind-forced circulation of the Hawaiian archipelago. Two strategies are explored for circulation modeling: forcing by the output of the wave model and online, two-way coupling of the circulation and wave models. In addition, the circulation model alone provides the reference for the circulation without the effect of the waves. These strategies are applied to two experiments: (1) typical trade-wind conditions that are frequent during summer months, and (2) the arrival of a large winter swell that wraps around the island. The results show the importance of considering the effect of the waves on the circulation and, particularly, the circulation-wave coupled processes. Both approaches show a similar nearshore circulation pattern, with the presence of an offshore current in the middle beaches of Waikiki. Although the pattern of the offshore circulation remains the same, the coupled waves and circulation produce larger significant wave heights ( ≈ 10 %) and the formation of strong alongshore and cross-shore currents (≈ 1 m s −1 ).

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Wave–Current Interaction: A Comparison of Radiation-Stress and Vortex-Force Representations

Cited by 97 publications

References 28 publications

Coupling of wave and circulation models in coastal–ocean predicting systems: a case study for the German Bight

Coupling of wave and circulation models in coastal–ocean predicting systems: a case study for the German Bight

Effects of waves on coastal water dispersion in a small estuarine bay

Different approaches to model the nearshore circulation in the south shore of O'ahu, Hawaii

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