Surface wave disturbance during internal wave propagation over various types of sea bottoms

Chen, Bang-Fuh; Huang, Yi-Jei; Chen, Bing; Tsai, Shang-Yu

doi:10.1016/j.oceaneng.2016.08.011

Cited by 11 publications

(1 citation statement)

References 24 publications

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“…First, the present model is based on potential flow theory in which complex processes like near-surface flow recirculation and mixing are not captured which can alter the behavior of surface waves. In addition, other factors like bathymetry effects (Chen et al 2016) or background current shear (Guyenne 2017) are not considered in the present study, which can affect the propagation of internal waves and their surface features. Last, there is an uncertainty in the surface current as it is approximated from observations that do not include the near surface currents and variations of small length scales (Vrećica et al 2022).…”

Section: Discussionmentioning

confidence: 99%

Direct Simulation of the Surface Manifestation of Internal Gravity Waves with a Wave–Current Interaction Model

Yue

Hao

Shen

et al. 2023

Journal of Physical Oceanography

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Internal solitary waves in the ocean are characterized by the surface roughness signature of smooth and rough bands that are observable in synthetic aperture radar satellite imagery, which is caused by the interaction between surface gravity waves and internal wave-induced surface currents. In this work, we study the surface signature of an internal wave packet in deep water over a large range of spatial scales using an improved wave-current interaction model that supports a moving surface current corresponding to a propagating internal gravity wave. After validating the model by comparison to previously published numerical results in Hao and Shen (2020), we investigate a realistic case based on a recent comprehensive field campaign conducted by Lenain and Pizzo (2021). Distinct surface manifestation caused by internal waves can be directly observed from the surface waves and the associated surface wave steepness. Consistent with observations, the surface is relatively rough where the internal wave-induced surface current is convergent (∂U/∂χ < 0), while it is relatively smooth where the surface current is divergent (∂U/∂χ > 0). The spatial modulation of the surface wave spectrum is rapid as a function of along-propagation distance, showing a remarkable redistribution of energy under the influence of the propagating internal wave packet. The directional wavenumber spectra computed in the smooth and rough regions show that the directional properties of the surface wave spectra are also rapidly modulated through strong wave-current interactions. Good agreement is found between the model results and the field observations, demonstrating the robustness of the present model in studying the impact of internal waves on surface gravity waves.

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Section: Discussionmentioning

confidence: 99%