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#246406 - 11/12/2001 22:17 What makes set waves???
pingtang Offline
Meteorological Motor Mouth

Registered: 18/11/2001
Posts: 5525
Loc: Nowra, NSW
I have been wondering lately,why set waves occur.Sometimes a set has 3 waves while others will have 8 or more waves.And then there are lulls which can last for up to 5 minutes or more on some days.

So why do set waves occur?

Is it because,the winds intensity inside the low changes quite often.

Does anyone have an idea about this?

[ 11-12-2001: Message edited by: pingtang ]
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#246407 - 12/12/2001 06:01 Re: What makes set waves???
Craig Arthur Offline
Wind hazard researcher

Registered: 08/05/2001
Posts: 3549
Loc: 149.152009°E 35.187056°...
Sets are the result of the waves being made up of a series of different frequency waves. This is the phenomenon of 'beating'. With two wave trains of a close (but not identical) frequency, they combine and we get a high frequency wave (the ones you would surf) and a much lower frequency wave which affects the amplitude (size) of the shorter frequency wave. I'll write out the maths behind this (it is quite simple, I promise!) and throw a diagram up to explain this tonight.
Probably a bit confusing, but once you see the diagram, it makes more sense. smile

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#246408 - 12/12/2001 12:16 Re: What makes set waves???
pingtang Offline
Meteorological Motor Mouth

Registered: 18/11/2001
Posts: 5525
Loc: Nowra, NSW
Thanks for that.

:cheers:
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