[A-OS11] Continental Oceanic Mutual Interaction - Planetary Scale Material Circulation

[AOS11-06] Sensitivity experiments on how the topographic resolution affects internal wave generation

*Qiang Li¹ (1.Tsinghua University)

Keywords:internal waves, numerical model, topography

Internal waves are generated from the interaction between tidal forcing and irregular bottom topography. Existing numerical or analytical models typically represent bottom topography using discrete stair-like structures. As technology advances, the ability to measure topographic features at finer resolutions increases. However, the essential question of determining the minimum topographic resolution required for accurate representation of internal wave generation remains unanswered. Utilizing a linear model, we establish a baseline resolution through comparison with analytical solutions, and subsequently employ a fully nonlinear numerical model to validate findings and explore resolution requirements. Considering topographic slopes and tidal excursions, our analysis identifies the barotropic to baroclinic tidal conversion rate and local dissipation as key criteria for determining optimal resolution. We propose a parameterization scheme tailored for coarse grid resolutions, striking a balance between computational efficiency and accuracy in simulating internal wave generation. This research contributes valuable insights for refining numerical representations in oceanographic studies.