Predicting Wave‐Induced Sediment Resuspension at the Perimeter of Lakes Using a Steady‐State Spectral Wave Model

<p>Forty years (1979-2019) of global wave hindcasts are developed with the third generation spectral wave model WAVEWATCH III&#174; using the state-of-the-art observation-based source term parameterizations (i.e., ST6) and the advanced irregular-regular-irregular (IRI) 1/4 grid system. The wave model has been forced with two distinct wind databases sourced from the latest NCEP Climate Forecast System (CFS) and the fifth generation of the ECMWF climate reanalyses (ERA5), together with the ice concentration available from the EUMETSAT OSI SAF (version 2). The hindcasts not only include traditional integral wave parameters (e.g., wave height, period) but also provide various novel parameters such as the dominant wave breaking probability, wave-induced mixed layer depth and whitecap coverage that are derived from wave spectrum based on previous theoretical and empirical studies. Wave parameters are extensively validated against observations from in-situ buoys and satellite altimeters on a global scale. Possible applications of these hindcasts in the fields of freak waves, sea spray and air-sea gas transfer will also be discussed.</p>

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The wave-current interaction in the coastal area

Journal of Marine Research ◽

10.1357/002224019833406169 ◽

2019 ◽

Vol 77 (5) ◽

pp. 375-405

Author(s):

Homayoon Komijani ◽

Jaak Monbaliu

Keyword(s):

Wind Waves ◽

Stress Gradient ◽

Circulation Model ◽

Wave Model ◽

Stokes Drift ◽

Test Case ◽

Mean Flow ◽

Radiation Stress ◽

Spectral Wave Model ◽

Wave Induced

In our investigation of the effect of wind-waves on barotropic mean flow in coastal areas, we compare two methods for calculating wave-induced force. The wave field is simulated by the nearshore spectral wave model SWAN. The wave-induced force (calculated using the radiation stress gradient and dissipation methods) and the Stokes drift are integrated in the COHERENS circulation model in the depth-averaged mode. The coupled set is validated using well-known academic test cases of planar beach and single-barred beach. Finally, in a two-dimensional test case based on Belgian coastal waters we compare simulations of mean flow using the two methods of calculating waveinduced force against field data.<br/> We show clearly that the two methods for calculation of wave-induced force yield very different results even in depth-averaged mode, depending on the angle of incident wave. Simulation of waveinduced circulation using the wave dissipation approach gives better results than using the radiation stress gradient approach. This is clearly visible for strong wave conditions in which the wind is blowing almost parallel to the shore. Under these conditions, the white-capping type of wave breaking is the dominant dissipation mechanism; in the radiation stress gradient, the dissipation signal is not visible, because the energy loss in the spectrum is compensated by wind input.

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STWAVE: Steady-State Spectral Wave Model User's Manual for STWAVE, Version 3.0

10.21236/ada392582 ◽

2001 ◽

Cited By ~ 47

Author(s):

Jane M. Smith ◽

Ann R. Sherlock ◽

Donald T. Resio

Keyword(s):

Steady State ◽

Wave Model ◽

Spectral Wave Model

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Evaluating the accuracy and uncertainty of atmospheric and wave model hindcasts during severe events using model ensembles

Ocean Dynamics ◽

10.1007/s10236-020-01426-9 ◽

2021 ◽

Author(s):

Ali Abdolali ◽

Andre van der Westhuysen ◽

Zaizhong Ma ◽

Avichal Mehra ◽

Aron Roland ◽

...

Keyword(s):

Extreme Event ◽

Numerical Models ◽

Model Performance ◽

Ground Truth ◽

Wave Model ◽

Atmospheric Model ◽

Stationary Source ◽

Source Point ◽

Spectral Wave Model ◽

Model Ensembles

AbstractVarious uncertainties exist in a hindcast due to the inabilities of numerical models to resolve all the complicated atmosphere-sea interactions, and the lack of certain ground truth observations. Here, a comprehensive analysis of an atmospheric model performance in hindcast mode (Hurricane Weather and Research Forecasting model—HWRF) and its 40 ensembles during severe events is conducted, evaluating the model accuracy and uncertainty for hurricane track parameters, and wind speed collected along satellite altimeter tracks and at stationary source point observations. Subsequently, the downstream spectral wave model WAVEWATCH III is forced by two sets of wind field data, each includes 40 members. The first ones are randomly extracted from original HWRF simulations and the second ones are based on spread of best track parameters. The atmospheric model spread and wave model error along satellite altimeters tracks and at stationary source point observations are estimated. The study on Hurricane Irma reveals that wind and wave observations during this extreme event are within ensemble spreads. While both Models have wide spreads over areas with landmass, maximum uncertainty in the atmospheric model is at hurricane eye in contrast to the wave model.

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Wave Directions in a Narrow Bay

Journal of Physical Oceanography ◽

10.1175/2009jpo4220.1 ◽

2010 ◽

Vol 40 (1) ◽

pp. 155-169 ◽

Cited By ~ 22

Author(s):

Heidi Pettersson ◽

Kimmo K. Kahma ◽

Laura Tuomi

Keyword(s):

Wave Model ◽

Wave Climate ◽

Spectral Peak ◽

Step Size ◽

Weakly Nonlinear ◽

Spectral Wave Model ◽

Directional Coupling ◽

Directional Wave ◽

The Baltic ◽

The Waves

Abstract In slanting fetch conditions the direction of actively growing waves is strongly controlled by the fetch geometry. The effect was found to be pronounced in the long and narrow Gulf of Finland in the Baltic Sea, where it significantly modifies the directional wave climate. Three models with different assumptions on the directional coupling between the wave components were used to analyze the physics responsible for the directional behavior of the waves in the gulf. The directionally decoupled model produced the direction at the spectral peak correctly when the slanting fetch geometry was narrow but gave a weaker steering than observed when the fetch geometry was broader. The method of Donelan estimated well the direction at the spectral peak in well-defined slanting fetch conditions, but overestimated the longer fetch components during wave growth from a more complex shoreline. Neither the decoupled nor the Donelan model reproduced the observed shifting of direction with the frequency. The performance of the third-generation spectral wave model (WAM) in estimating the wave directions was strongly dependent on the grid resolution of the model. The dominant wave directions were estimated satisfactorily when the grid-step size was dropped to 5 km in the gulf, which is 70 km in its narrowest part. A mechanism based on the weakly nonlinear interactions is proposed to explain the strong steering effect in slanting fetch conditions.

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