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Posted (edited)

How is the spectral peak of a 2D wave spectrum defined when calculating e.g. the peak period or the mean direction at the spectral peak?

 

Do you a) pick the point in the two dimensional frequency-direction space with the most energy, or do you b) integrate over all direction (thus turning the whole thing to a 1D-spectrum, and then pick the frequency with the most energy from there?

 

For example in the spectrum with mock values:

0 deg 90 deg 180 deg 270 deg

0.1 Hz 0 0 0 0

0.5 Hz 0.1 0.3 0.5 0.2

1.0 Hz 0 0 1 0

 

method a) whould result in a peak period of 1s (1 Hz), and method b) in a peak period of 2s (0.5 Hz). The mean direction at the spectral peak would also differ, because it would be calculated over different frequancy bands.

Edited by tmpst

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