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Ocean Current Probability And Return Period

Calculate ocean current velocity from return period data using the Weibull, Gumbel or Frechet probability distributions.

The three parameter distribution and Z offset is used to account for a minimum value, the smallest event which can occur in any sample period. The best fit line is calculated for the data points using the least squares linear regression method. The regression is calculated for return period versus amplitude (the X and Z values are swapped). Use the Data Plot option on the plot bar to display the data points and the calculated best fit. The regression data points and regression parameters are displayed in the output view at the bottom of the page.

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CALCULATOR : Ocean Current Velocity From Return Period Data Weibull Gumbel And Frechet Distribution [FREE]   ±

Calculate ocean current velocity from return period data using the Weibull, Gumbel or Frechet distributions.

The current velocity is calculated at the design elevation using either the logarithmic profile or the 1/7th power law profile. The reduced velocity includes the velocity reduction factor.

Enter the return period (R) and current velocity (V) data values as pairs separated by a comma or tab (R, V), with each data pair on a new line. The data pairs can also be copied and pasted from a spreadsheet. Use the Data Plot option to plot the data points with the calculated linear regression best fit. The regression output is displayed at the bottom of the page.

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 : Ocean Current Average Velocity From Return Period Data Weibull Gumbel And Frechet Distribution [FREE]   ±

Calculate average current velocity from return period data using the Weibull, Gumbel or Frechet distributions.

Calculate the current velocity using either the logarithmic profile or the 1/7th power law profile (calculate the current velocity at the design elevation or the average current velocity across the pipeline or structure).

Enter the return period (R) and current velocity (V) data values as pairs separated by a comma or tab (R, V), with each data pair on a new line. The data pairs can also be copied and pasted from a spreadsheet. Use the Data Plot option to plot the data points with the calculated linear regression best fit. The regression output is displayed at the bottom of the page.

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 : Ocean Extreme Event Encounter Probability [FREE]   ±

Calculate ocean wave and current exceedance probability, cumulative probability, and encounter probability from the return period.

The exceedance probability is the probability of the return period wave or current occurring in any sample period (for example the probability of a 20 year wave or current occurring in any sample period). The cumulative probability is the probability of the return period wave or current not occurring in any sample period (for example the probability of a 20 year wave or current not occurring in any sample period). The encounter probability is the probability of the return period wave or current occurring in the design period (for example the probability of a 20 year wave or current occurring in a 30 year design period).

Tool Input

  • sptype : Sample Period Type
    • su : User Defined Sample Period
  • R : Return Period
  • D : Design Period

Tool Output

  • Pc : Cumulative Probability
  • Pe : Encounter Probability
  • Px : Exceedance Probability
  • S : Sample Period
  • nd : No Of Samples In Design Period
  • nr : No Of Samples In Return Period
CALCULATOR : Ocean Extreme Event Amplitude From Return Period Data Weibull Gumbel And Frechet Distribution [FREE]   ±

Calculate general ocean current and wave extreme event amplitude from return period data using the Weibull, Gumbel or Frechet distributions (for example current velocity, wave height, wave period etc).

Enter the return period (R) and extreme event amplitude (A) data values as pairs separated by a comma or tab (X, Z), with each data pair on a new line. The data pairs can also be copied and pasted from a spreadsheet. Use the Data Plot option to plot the data points with the calculated linear regression best fit. The regression output is displayed at the bottom of the page.

Tool Input

  • sptype : Sample Period Type
    • Su : User Defined Sample Period
  • offtype : Parameter Type
    • Aou : User Defined Amplitude Offset
  • rtype : Regression Probability Distribution Type
  • Rdata : Return Period Data
  • Adata : Amplitude Data
  • R : Return Period

Tool Output

  • A : Amplitude
  • Ao : Amplitude Offset
  • Md : Median Amplitude
  • Mn : Mean Amplitude
  • Mo : Mode Amplitude
  • S : Sample Period
  • r : Correlation Coefficient
CALCULATOR : Ocean Current Velocity Reduction Factor [FREE]   ±

Calculate 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
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