JONSWAP Wave Spreading Calculators

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Beams ±

References ±

Fluid Flow ±

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Pipelines ±

Soils ±

Subsea ±

Demo

JONSWAP Wave Directionality And Spreading

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

Wave spreading accounts for the effect of short crested "choppy" waves with non uniform velocity and heading. By comparison, long ocean swells tend to have uniform velocity and direction, expecially in mid ocean. Use small spreading factors for "choppy" waves, and large spreading factors for ocena swells.

Reference : Hasselmann K et al : Measurements of Wind-Wave Growth And Swell Decay During The Joint North Sea Wave Project (JONSWAP)

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Links : ±

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

CALCULATOR : JONSWAP Ocean Current Velocity Reduction Factor [FREE] ±

Calculate JONSWAP ocean current velocity reduction factor from relative heading to a pipeline or structure.

A relative heading of zero degrees is parallel to the pipeline or structure, or ninety degrees is perpendicular to the pipeline or structure.

Tool Input

hctype : Current Heading Type
- Φcu : User Defined Current Relative Heading

Tool Output

Φrc : Relative Current Heading
Rdc : Current Velocity Reduction Factor