JONSWAP Wave |
 
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JONSWAP Wave |
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Input: |
Description |
Wave Height: |
The spectrum significant wave height Hs. |
Peak Period: |
The spectrum peak period Tp in seconds. |
Peakedness Parameter: |
The spectrum peakedness parameter γ. |
Max Frequency Increment: |
The maximum frequency increment in Hz. to be used in the spectral discretisation. See Note (b). |
Cut – off Frequency: |
The cut-off or Nyquist frequency in Hz. See Note (b). |
No. of Harmonics: |
The number of harmonics to be used in the spectral discretisation. See Note (b). |
Wave Directions: |
The number of wave directions. The default of 1 gives a uni-directional random sea, greater than 1 gives a multi-directional sea. See Note (c). |
Dominant Direction: |
The wave direction in a uni-directional sea, or the dominant wave direction in a multi-directional random sea, measured in degrees anticlockwise from the global Y direction. See Note (c). |
Wave Spreading Exponent: |
The exponent used in distributing wave energy between directions in a multi-directional random sea. See Note (c). |
(a)Refer to Jonswap Wave for further information on the Jonswap spectral formulation.
(a)The wave spectrum may be discretised into segments based on an equal area approach (which divides the area under the spectrum into segments of equal area) or a geometric progression approach (based on frequency increments that form a geometric progression). Refer to Spectrum Discretisation for a detailed discussion of this discretisation procedure.
(b)A multi-directional random sea is defined in terms of a dominant wave direction and the number of wave directions. Refer to Wave Energy Spreading for further information.