Lee-Wave Energy Sinks in Bottom-Intensified Flow: Reabsorption, Dissipation and Nonlinear Spectral Transfer
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929268541358080 |
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| author | Wu, Yue Cynthia Kunze, Eric Tandon, Amit Mahadevan, Amala |
| author_facet | Wu, Yue Cynthia Kunze, Eric Tandon, Amit Mahadevan, Amala |
| contents | Idealized numerical simulation is used to explore energy sinks for lee waves trapped in their bottom-intensified generating flow. In addition to the loss to explicit dissipation and reabsorption predicted by linear wave action conservation, indirect dissipation due to a nonlinear forward cascade by parametric subharmonic instability represents a significant sink that substantially reduces reabsorption. The partition of lee-wave energy loss between reabsorption and (explicit plus indirect) dissipation is independent of subgridscale damping parameterization. Remote dissipation of freely propagating internal waves generated by shear instability at the lee-wave critical layer proves to be small. A general parameterization for lee-wave dissipation of the balanced flow requires a more complete exploration of the parameter space. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_04939 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Lee-Wave Energy Sinks in Bottom-Intensified Flow: Reabsorption, Dissipation and Nonlinear Spectral Transfer Wu, Yue Cynthia Kunze, Eric Tandon, Amit Mahadevan, Amala Fluid Dynamics Atmospheric and Oceanic Physics Geophysics Idealized numerical simulation is used to explore energy sinks for lee waves trapped in their bottom-intensified generating flow. In addition to the loss to explicit dissipation and reabsorption predicted by linear wave action conservation, indirect dissipation due to a nonlinear forward cascade by parametric subharmonic instability represents a significant sink that substantially reduces reabsorption. The partition of lee-wave energy loss between reabsorption and (explicit plus indirect) dissipation is independent of subgridscale damping parameterization. Remote dissipation of freely propagating internal waves generated by shear instability at the lee-wave critical layer proves to be small. A general parameterization for lee-wave dissipation of the balanced flow requires a more complete exploration of the parameter space. |
| title | Lee-Wave Energy Sinks in Bottom-Intensified Flow: Reabsorption, Dissipation and Nonlinear Spectral Transfer |
| topic | Fluid Dynamics Atmospheric and Oceanic Physics Geophysics |
| url | https://arxiv.org/abs/2403.04939 |