wave duct

wave duct

[′wāv ‚dəkt]
(electromagnetism)
Waveguide, with tubular boundaries, capable of concentrating the propagation of waves within its boundaries.
Natural duct, formed in air by atmospheric conditions, through which waves of certain frequencies travel with more than average efficiency.
References in periodicals archive ?
(8) The algorithm was simple: determine if a density current will generate a bore and a suitable wave duct is in place (using the parameters Fr and H from hydraulics and the Scorer parameter from linear wave theory).
5): the height and speed of a density current, the non-steady-state evolution of a bore, the impact of stability above the wave duct on weakly nonlinear wave solutions, and the interaction of bores with tropospheric gravity waves.
Solutions to KdV and BDO exist for environments that possess varying stratification within a wave duct [using KdV (Lamb and Yan 1996) or DJL (White and Helfrich 2012)] and with linearly varying shear included [using KdV and BDO (Rottman and Einaudi 1993) or DJL (Stastna and Lamb 2002)], but with a wave duct contained below a deep neutral layer that prevents wave radiation.
A particularly frequent source of wave energy in the nonneutral layer above a wave duct is low-frequency, deep tropospheric gravity waves generated by modulation of the latent heating/cooling profiles (Nicholls et al.
For medium-to-long-range forecast models, which parameterize convection, parameterization schemes should be developed that function in coarse-resolution model space (such as PBL height, wave duct height, and convective precipitation) as a proxy for the development of bores.