JONSWAP Calculators - Pipeng Toolbox

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CALCULATOR : JONSWAP Wave Spectrum [FREE] ±

Calculate JONSWAP wave surface spectral density and subsea velocity spectrum from the significant wave height and peak wave period using the JONSWAP spectrum.

The wave induced velocity spectrum on or above the seabed is calculated using a first order Airy wave spectral transformation function.

Tool Input

gatype : Gamma Factor Type
- γu : User Defined Gamma
d : Water Depth
Hs : Wave Significant Height
Tp : Peak Wave Period
Tw : Wave Period
z : Height Above Seabed

Tool Output

α : Alpha Generalised Phillips Constant
γ : Gamma Peak Enhancement Factor
σ : Sigma Spectral Width Parameter
ωp : Wave Peak Frequency
ωw : Wave Frequency
G : Transfer Function
L : Wave Length
Ss : Surface Spectral Density Function
Su : Seabed Velocity Function
cvg : Convergence Factor
k : Wave Number

CALCULATOR : JONSWAP Ocean Wave Spreading And Velocity Reduction Factor [FREE] ±

Calculate JONSWAP wave velocity reduction factor from relative heading and spreading factor.

The spreading factor accounts for wave 'choppiness', the tendency for intersecting waves from multiple directions. Smaller spreading factor indicates more choppiness. A relative heading of ninety degrees is perpendicular to the structure.

Tool Input

sfactype : Shape Factor Type
- su : User Defined Spreading Factor
rdtype : Velocity Reduction Factor Type
Φ : Relative Wave Heading

Tool Output

Rdw : Wave Velocity Reduction Factor
kw : Wave Shape kw Factor
sf : Wave Shape Factor