A WKB derivation for internal waves generated by a horizontally moving body in a thermocline
An approximate solution for the steady linear internal wave field generated by a localized, horizontally moving source in a thermocline is derived using ray and WKB (Wentzel–Kramers–Brillouin) theory. The waves are assumed to be steady in a reference frame moving with the source velocity. This solut...
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| Veröffentlicht in: | Wave motion 2021-09, Vol.105, p.102759, Article 102759 |
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| creator | Broutman, Dave Brandt, Laura Rottman, James W. Taylor, Cecily K. |
| description | An approximate solution for the steady linear internal wave field generated by a localized, horizontally moving source in a thermocline is derived using ray and WKB (Wentzel–Kramers–Brillouin) theory. The waves are assumed to be steady in a reference frame moving with the source velocity. This solution is shown to agree in the limit of propagating waves with an existing solution that is expressed in terms of an eigenfunction expansion. The WKB method is shown to reproduce all the factors in the eigenfunction solution, not just the eigenfunctions themselves. It also reveals the physical significance of the terms in the eigenfunction solution. Furthermore, the WKB solution suggests an alternate way to compute the wave field numerically that is computationally more efficient. |
| doi_str_mv | 10.1016/j.wavemoti.2021.102759 |
| format | Article |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Eigenvectors Expansion Harmonic analysis Internal waves Propagation Stratified flow Studies Surface waves Velocity Wakes Wave propagation WKB approximation |
| title | A WKB derivation for internal waves generated by a horizontally moving body in a thermocline |
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