Babineau, Marie2023-12-112023-12-112023-12-08http://hdl.handle.net/10222/83206Lee wave dissipation rates estimated from observations are two to three times lower than those predicted by models. However, such models have assumed a constant background current into which the waves propagate. To explore the impact of depth-varying currents on lee waves, I have run idealized 2D numerical simulations with sinusoidal bathymetry and linearly varying currents. For both bottom- and surface-intensified currents, waves propagate to the surface when their frequency ($\Omega$) remains within the radiating range, $f<\Omega < N$. In contrast, waves reach an evanescent layer when their frequency is Doppler-shifted to the limits of the radiating range, namely a dissipative layer when $\Omega=f$ or an internal reflective layer when $\Omega=N$. All simulations are time-dependent, with the generation of inertial oscillations and interference patterns when reflection occurs. Furthermore, depth-varying currents allow for energy exchanges, a dominant feature of wave energetics.enInternal waveEnergy dissipationTurbulenceWave actionNumerical simulation