swell & swell 2
What ist the definition of "swell" and "swell 2", respectively what ist the difference between these two categories?
As you probably know the shape of waves, in a given place, is a mix of different kind of waves:
The windsea (also called wind waves) is produced by the local wind.
The main swell is produced by a strong wind far away.
Secondary swells are produced also by winds far away but in other places.
All of them have different heights, come from different directions and show different periodes (which is the time between 2 wave crests)
Swell 1 is the main swell, swell 2 and 3 are secondary swells (the swell classification 1, 2, 3 depends on their respective height).
For example close to NewZealand coast you can observe different swell trains due to several storms at this season.
In this example, main swell is E-W and Swell 2 is S-N caused by 2 different storms.