Topographic sideband of an internal gravity wave
= Topographic sideband of an internal gravity wave
Reflection from periodic topography couples an incident horizontal wavenumber $k$ to sidebands $k+jk_T$. Expanding the impermeability condition on a boundary of small amplitude $h_0$ produces the $j=\pm1$ sidebands at order $h_0$ and the $j=0,\pm2$ corrections at order $h_0^2$.
= Topographic sidebands of an internal gravity wave
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