Talk:Lee wave

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Aviation: Gliding

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Physics: Fluid Dynamics Mid‑importance

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Untitled[edit]

I just want to comment on the figure displayed to illustrate this topic, which fails to portray an important feature of lee waves.

The figures shows an air flow that is pressed up over a montain, and then, further up, by a rotor.

This is incorrect. Actually, the airflow, moves down behind the mountain and beyond its original altitude. In a stable atmosphere, this will cause the air to 'bounce' up again, and then oscillate about its original altitude, creating a sequence of standing waves. The rotor will usually form under the top of each wave.

Thanks for that input I'll update the drawing. --Timothy Truckle 14:31, 19 April 2007 (UTC)[reply]

If the conditions are 'right', such waves may propagate upwards to the tropospause (and even beyond). In fact, glider pilots have used the upward moving part of lee waves to climb to altitudes of 50.000 feet/15.000m above sea level.

This effect is also called fohn wind, these two articles are of the identical subject...

Nope, fohn winds usually down't cause lee waves. The reason is that fohn wind "sucks" additional air from a higher layer of air with the boundary layer relatively close to the mountain top.

Lee waves develop when the wind causes a low pressure area at the mountains lee side. Fohn conditions do not have such a low pressure area.--Timothy Truckle (talk) 15:16, 21 April 2010 (UTC)[reply]

Rotor[edit]

Although 'rotor' is mentioned several times (indeed the article 'rotor (meteorology)' actually redirects here) I couldn't see a description of what a rotor actually is (other than the unclear "turbulent horizontal vortex is generated around the first trough") nor a clear explanation of how it relates to the lee wave (or part of a lee wave). Could someone who knows add this please? Could a diagram be added? Alternatively, if appropriate and relevant, could the caption to the existing diagram be augmented with 'rotor' indication? Feline Hymnic (talk) 12:52, 16 August 2010 (UTC)[reply]

OK, I've slightly edited the sentence in the lead to try to make it clear, so a casual, non-expert reader can imagine what's going on. Feline Hymnic (talk) 12:30, 5 June 2011 (UTC)[reply]

Good work. Will Beback talk 20:38, 5 June 2011 (UTC)[reply]

Sailing[edit]

Unless there are any objections, I would like to delete the section on Sailing completely. I believe the anonymous editor is getting confused with Katabatic wind, in particular, the Bora (wind). This section contains no citations. Other dubious points: Why should Bermudan rigged boats be particularly vulnerable? 'Sails pushed underwater' - Really? Fi9 (talk) 23:07, 1 May 2013 (UTC)[reply]

Standing waves[edit]

I reformatted the first sentence of the article. I reckon lee waves are not standing waves in the sense the term is applied in physics. "Standing wave" refers to a superposition of two waves with opposite headings. The two waves interfere and create stationary lobes that still oscillate. This is what happens in eg. musical instruments (strings and flutes).

Rather, a lee wave resembles the wake of a boat which is stationary in the boat's coordinate system. And it's exactly equivalent to a lee wave of a rock near the surface of a river. These are not to be considered standing waves. 91.152.71.203 (talk) 22:50, 19 December 2014 (UTC)[reply]

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