Pipeng Toolbox : DNVGL-RP-F109 Seabed Velocity Calculators Blank User
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DNVGL RP F109 Wave Seabed Velocity

Calculate DNVGL RP-F109 wave seabed velocity from the JONSWAP surface spectrum.

An Airy wave transform is used to calculate the significant seabed velocity, and zero upcrossing wave period. The calculation is not valid in shallow water, or at elevations greater than half the water depth.

Reference : DNVGL-RP-F109 : On-Bottom Stability Design Of Submarine Pipelines (Download from the DNVGL website)

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CALCULATOR : DNVGL-RP-F109 Section 3.4.3 Seabed Wave Velocity And Zero Upcrossing Period From JONSWAP Spectral Moments [FREE]   ±

Calculate seabed significant wave velocity and zero upcrossing wave period from JONSWAP spectral moments (DNVGL-RP-F109 section 3.4.3).

The seabed spectrum is calculated from the JONSWAP surface spectrum using an Airy wave transform function. The calculation may not be valid in shallow water (use with care). The calculation should be used for seabed or near seabed elevations. The calculation should not be used for elevations greater than half the water depth.

Tool Input

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

Tool Output

  • γ : Gamma Peak Enhancement Factor
  • ωp : Wave Peak Frequency
  • L : Wave Length
  • M0 : 0th Spectral Moment
  • M2 : 2nd Spectral Moment
  • Tz : Zero Upcrossing Period
  • Us : Significant Wave Velocity
  • cvg : Convergence Factor
  • kw : Wave Number