2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/85758An experimental study is reported of the near-critical reflection of internal gravity waves over sloping topography in a stratified fluid. An overturning instability close to the slope and triggering the boundary-mixing process is observed and characterized. These observations are found in good agreement with a recent nonlinear theory.resubmitted to Physics of Fluids (Nov. 2003), Figs. with color picturesFluid Dynamicstext