Talk:Infragravity wave
 | A fact from Infragravity wave appeared on Wikipedia's Main Page in the Did you know column on 28 February 2010 (check views). The text of the entry was as follows:
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Generation
[edit]These low-frequency waves are primarily generated by non-linear wave interactions: both with other wave frequencies, by interaction with the sea bed (near the shore) and by interactions with the variations in the position where the waves break. In all these the crucial elements are the non-linearity of the waves and wave grouping.
The section now primarily talks about the secondary effects, such as the enhancement of the generation of low-frequency waves by periodic bedforms and possible resonances behind and on sand bars. -- Crowsnest (talk) 11:31, 29 October 2011 (UTC)
Periods of Infragravity waves
[edit]In my Coastal Dynamics courses I learned Infra-Gravity wave periods span 25 - 250 seconds. Certainly not wind waves and tides, even swell is doubtful. One of the clearest types of infra-gravity waves is the bound long wave traveling with the wave group. Fact check and source the entire first paragraph, I reckon its correct!
Hobbels (talk) 17:50, 18 June 2012 (UTC)
What does vertical axis of graph represent?
[edit]The graph captioned "Classification of the spectrum of ocean waves according to wave period" should be modified to indicate what the vertical axis represents. Is it the likelihood of observing waves of a given wave period? The amount of energy? Wave height? I don't have access to the source article which presumably would explain this.
--E-hadj (talk) 18:25, 11 September 2017 (UTC)
Vertical axis is the relative amplitude of the wave.
[edit]Original source is available here: [1]
Original caption is: "Fig. 1. Tentative classification of ocean waves according to wave period. The forces responsible for various portions of the spectrum are shown. The relative amplitude is indicated by the curve." (note the last sentence, which answers your query)