Do any one know how to calculate H2%?? Using Significant Wave Height Data?
Hi,
H2%=1.39*SignificantWaveHeight
Explanation:
H2%=2.23*MeanWaveHeight (e.g., Lopatoukhin. 2004, Wind Waves, ISBN 5-87403-050-6)
SignificantWaveHeight = 1.6*MeanWaveHeight (e.g. Janssen. 2004, Interaction of ocean waves and wind, CUP, 385 p.)
hello
They are slightly different definition
1) Sig. wave height= four times the standard deviation of the surface elevation – or equivalently as four times the square root of the zeroth-order moment (area) of the wave spectrum (ref. Holthuijsen, Leo H. (2007). Waves in Oceanic And Coastal Waters. Cambridge University Press. p. 70. ISBN 978-0-521-86028-4). or
2) The significant wave height is defined traditionally as the mean wave height (trough to crest) of the highest third of the waves (H1/3).
There are small differences between the two definitions
Concerning H2%, I think it is equivalent to percentile 98th of the wave distribution
See attach document:
http://www.mxak.org/weather/pdfs/waves.pdf
Good luck
Hello,
I understand that H2 and Hs (average significant wave height) are the same thing which is the wave height of the 1/3rd highest waves in a given time group.
The percentage the Hs value is of all the waves in the group is = (.66 +1)/2 = .83
hence the conversion of average Hs to Havg is Havg = Hs*.83
So, the average wave height [Havg] of all the waves in the group where the Hs = .25 m would be = .25 * .83 = .2075 m
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