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Ocean Current

Calculate current velocity versus water depth using either the logarithmic profile or the 1/7th power law profile.

The current velocity is calculated relative to a measured reference velocity at a reference elevation. For best results the reference velocity should be measured at an elevation close to the target elevation. Current flow can be stratified with different layers moving at different speeds and directions. The current velocity can be calculated at a single point or averaged over a range. The logarithmic and power law profiles are only valid in the current boundary layer near the seabed.

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    CALCULATOR : Ocean Current Velocity [FREE]   ±

    Calculate ocean current velocity from a reference velocity and the height above the seabed using either the logarithmic profile or the one seventh power law profile.

    A relative current heading of zero degrees is parallel to the structure, or ninety degrees is perpendicular to the structure. Use the Result Plot option to display the logarithmic and power law reduced velocity profiles.

    Tool Input

    • roughtype : Seabed Roughness Type
      • zou : User Defined Seabed Roughness
    • uctype : Current Velocity Type
    • Ur : Current Velocity At Reference Elevation
    • Zr : Reference Elevation Above Seabed
    • Z : Design Elevation Above Seabed

    Tool Output

    • Uc : Current Velocity
    • ro : Seabed Roughness

    CALCULATOR : Ocean Current Average Velocity [FREE]   ±

    Calculate ocean current velocity and average velocity for a subsea pipeline or structure on or above the seabed using either the logarithmic profile or the one seventh power law profile.

    A relative current heading of zero degrees is parallel to the pipeline, or ninety degrees is perpendicular to the structure. Use the Result Plot option to display the logarithmic and power law reduced velocity profiles.

    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
    • OOD : Pipe Outer Diameter Or Height Of Structure
    • Ur : Current Velocity At Reference Elevation
    • Zr : Reference Elevation Above Seabed

    Tool Output

    • Uc : Current Velocity
    • Zbop : Base Of Pipeline Or Structure Height Above Seabed
    • Zmop : Middle Of Pipeline Or Structure Height Above Seabed
    • Ztop : Top Of Pipeline Or Structure Height Above Seabed
    • ro : Seabed Roughness

    CALCULATOR : Seabed Roughness [FREE]   ±

    Calculate seabed soil diameter and roughness from seabed type (silt and clay, fine sand, medium sand, coarse sand, gravel, pebble, cobble, boulder, orf user defined).

    Use the Result Table option to display a table of soil diameter and roughness.

    Tool Input

    • roughtype : Seabed Roughness Type
      • dou : User Defined Mean Soil Diameter
      • zou : User Defined Seabed Roughness

    Tool Output

    • do : Mean Soil Diameter
    • zo : Seabed Roughness
    CALCULATOR : Ocean Current Velocity From Return Period Data [FREE]   ±

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

    A relative current heading of zero degrees is parallel to the structure, or ninety degrees is perpendicular to the structure. Use the Result Plot option to display the logarithmic and power law reduced velocity profiles. Enter data values as pairs separated by a comma (R, V), 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 : Ocean Current Average Velocity From Return Period Data [FREE]   ±

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

    A relative current heading of zero degrees is parallel to the structure, or ninety degrees is perpendicular to the structure. Use the Result Plot option to display the logarithmic and power law reduced velocity profiles. Enter data values as pairs separated by a comma (R, V), 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 : Ocean Current Velocity Reduction Factor [FREE]   ±

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

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

    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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