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DNVGL RP F109 Wave Probability And Return Period

Calculate DNVGL RP-F109 wave and current amplitude from return period data.

Current velocity, wave height, and wave period can be calculated from return period data using either the Weibull, Gumbel or Frechet probability distributions. Enter data as comma or tab separated sets (eg R, Vc), with each set on a new row. Data can also be copied and pasted from a spreadsheet, or from a text document.

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 3.4.2 Ocean Current Velocity From Return Period Data [FREE]   ±

Calculate ocean current velocity from return period data using either the Weibull, Gumbel or Frechet distributions (DNVGL-RP-F109 section 3.4.2).

The regression output is displayed at the bottom of the page. Enter current data values as return period reference velocity pairs separated by a comma (R, Vr), with each data pair on a new line.

Tool Input

  • roughtype : Seabed Roughness Type
    • zou : User Defined Seabed Roughness
  • uctype : Current Velocity Type
  • sptype : Current Sample Period Type
    • Su : User Defined Current Sample Period
  • offtype : Probability Function Parameter Type
    • Uou : User Defined Minimum Current Velocity
  • rtype : Linear Regression Type
  • Rdata : Return Period Data
  • Vdata : Current Velocity Data
  • Zr : Reference Elevation Above Seabed
  • Z : Design Elevation Above Seabed
  • R : Design Return Period

Tool Output

  • S : Current Sample Period
  • Uc : Current Velocity
  • Ur : Current Velocity At Reference Elevation
  • Urm : Mean Current Velocity At Reference Elevation
  • Vo : Minimum Current Velocity At Reference Elevation
  • ro : Seabed Roughness

CALCULATOR : DNVGL-RP-F109 Section 3.4.2 Ocean Current Average Velocity From Return Period Data [FREE]   ±

Calculate ocean current average velocity from return period data using either the Weibull, Gumbel or Frechet distributions (DNVGL-RP-F109 section 3.4.2).

The current velocity can be calculated at the top of the pipeline, bottom of the pipeline, middle of the pipeline, user defined elevation, or averaged across the pipeline diameter.

The regression output is displayed at the bottom of the page. Enter current data values as return period reference velocity pairs separated by a comma (R, Vr), with each data pair on a new line.

Tool Input

  • roughtype : Seabed Roughness Type
    • zou : User Defined Seabed Roughness
  • zptype : Pipeline Or Structure Height Type
    • G : User Defined Gap Under Pipeline
    • B : User Defined Burial Depth
  • zhtype : Design Height Above Seabed Type
    • Zu : User Defined Height Above Seabed
  • uctype : Current Velocity Type
  • sptype : Current Sample Period Type
    • Su : User Defined Current Sample Period
  • rtype : Linear Regression Type
  • offtype : Probability Function Parameter Type
    • Uou : User Defined Minimum Current Velocity
  • Rdata : Return Period Data
  • Vdata : Current Velocity Data
  • OOD : Pipe Outer Diameter Or Height Of Structure
  • Zr : Reference Elevation Above Seabed
  • R : Design Return Period

Tool Output

  • S : Currrent Sample Period
  • Uc : Current Velocity
  • Ur : Current Velocity At Reference Elevation
  • Urm : Mean Current Velocity At Reference Elevation
  • Vo : Minimum Current Velocity At Reference Elevation
  • Zbop : Base Of Pipeline Or Structure Elevation Above Seabed
  • Zmop : Middle Of Pipeline Or Structure Height Above Seabed
  • Ztop : Top Of Pipeline Or Structure Height Above Seabed
  • ro : Seabed Roughness

CALCULATOR : DNVGL-RP-F109 Section 3.4.3 Ocean Wave Height Wave Period And Velocity From Return Period Data [FREE]   ±

Calculate seabed significant wave velocity and zero upcrossing wave period from return period data using either the Weibull, Gumbel or Frechet distributions (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

  • sptype : Wave Sample Period
    • Su : User Defined Wave Sample Period
  • offtype : Probability Function Parameter Type
    • Hou : User Defined Minimum Wave Height
    • Tou : User Defined Minimum Wave Period
  • rtype : Linear Regression Type
  • gatype : Gamma Factor Type
    • γu : User Defined Gamma
  • Rdata : Return Period Data
  • Hdata : Wave Significant Height Data
  • Tdata : Wave Peak Period Data
  • R : Design Return Period
  • d : Water Depth
  • Z : Design Elevation Above Seabed

Tool Output

  • γ : Gamma Peak Enhancement Factor
  • ωp : Wave Peak Frequency
  • Ho : Minimum Wave Height
  • Hs : Significant Wave Height
  • Hsm : Mean Significant Wave Height
  • L : Wave Length
  • M0 : 0th Spectral Moment
  • M2 : 2nd Spectral Moment
  • S : Sample Period
  • To : Minimum Peak Wave Period
  • Tp : Peak Wave Period
  • Tpm : Mean Peak Wave Period
  • Tz : Zero Upcrossing Period At Design Elevation
  • Us : Significant Wave Velocity At Design Elevation
  • cvg : Convergence Factor
  • kw : Wave Number

CALCULATOR : DNVGL-RP-F109 Section 3.4 Ocean Wave And Current Velocity From Return Period Data [PLUS]   ±

Calculate combined ocean wave and current seabed velocity and zero crossing period from return period data using the Weibull, Gumbel or Frechet distributions (DNVGL-RP-F109 section 3.4).

The current velocity is calculated at the design elevation for either the logarithmic profile or the 1/7th power law profile. The seabed significant wave induced velocity and zero crossing period are calculated from significant wave height and peak wave period using the JONSWAP spectrum with an Airy wave transformation. The calculation is optimised for seabed or near seabed elevations and should not be used for elevations greater than half the water depth.

Enter data values as sets of four values separated by a comma or tab (R, H, T, Ur), with each data set on a new line. The regression output is displayed at the bottom of the page.

Tool Input

  • spwtype : Wave Sample Period Type
    • Swu : User Defined Wave Sample Period
  • spctype : Current Sample Period Type
    • Scu : User Defined Current Sample Period
  • offtype : Probability Function Parameter Type
    • Hou : User Defined Minimum Wave Height
    • Tou : User Defined Minimum Wave Period
    • Uou : User Defined Minimum Current Velocity
  • rtype : Linear Regression Type
  • roughtype : Seabed Roughness Type
    • zou : User Defined Seabed Roughness
  • uctype : Current Velocity Type
  • gatype : Gamma Factor Type
    • γu : User Defined Gamma
  • Rdata : Return Period Data
  • Hdata : Wave Significant Height Data
  • Tdata : Wave Peak Period Data
  • Udata : Current Velocity Data
  • R : Design Return Period
  • d : Water Depth
  • Z : Design Elevation Above Seabed
  • Zr : Reference Elevation Above Seabed

Tool Output

  • γ : Gamma Peak Enhancement Factor
  • ωp : Wave Peak Frequency
  • Ho : Minimum Wave Height
  • Hs : Significant Wave Height
  • Hsm : Mean Significant Wave Height
  • L : Wave Length
  • M0 : 0th Spectral Moment
  • M2 : 2nd Spectral Moment
  • Sc : Current Sample Period
  • Sw : Wave Sample Period
  • To : Minimum Wave Period
  • Tp : Peak Wave Period
  • Tpm : Mean Wave Period
  • Tz : Zero Upcrossing Period At Design Elevation
  • Uc : Current Velocity At Design Elevation
  • Uc/Ut : Current Velocity Over Total Velocity Ratio
  • Ur : Current Velocity At Reference Elevation
  • Urm : Mean Current Velocity At Reference Elevation
  • Us : Significant Wave Velocity At Design Elevation
  • Ut : Total Wave And Current Velocity At Design Elevation
  • cvg : Convergence Factor
  • kw : Wave Number
  • ro : Seabed Roughness
  • uo : Minimum Current Velocity At Reference Elevation

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