Calculate ocean wave and current velocity and acceleration for Airy, Stokes, cnoidal and JONSWAP waves.
Wave velocity and acceleration can be calculated for Airy, Stokes, and Cnoidal waves. The recommended wave type is displayed below the calc bar. Use the Result Plot option to compare the Airy, Stokes, and cnoidal wave profiles. The seabed significant wave velocity and zero upcrossing period can be calculated from the JONSWAP surface spectrum.
Current velocity can be calculated near the seabed using either the logarithmic profile, or the 1/7th power law profile. The logarithmic and power law profiles are not valid For large elevations above the seabed.
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CALCULATOR : Ocean Wave And Current Velocity Airy Stokes And Cnoidal Wave [PLUS] ±
Calculate combined ocean wave and current velocity and acceleration for Airy, Stokes and cnoidal waves. Wave length can be calculated from wave period, or wave period can be calculated from wave length. Current velocity can be calculated near the seabed using either the logarithmic profile, or the 1/7th power law profile. The velocity and acceleration can be calculated at either the wave surface (varies with phase angle), the wave trough height, the seabed, or at a user defined height above the seabed. Use the Result Plot option to plot the wave profiles, wave velocity or wave acceleration versus phase angle. Tool Input- uctype : Current Velocity Type
- roughtype : Seabed Roughness Type
- zou : User Defined Seabed Roughness
- wavetype : Wave Type
- lttype : Wave Parameter Type
- Tu : User Defined Wave Period
- Lu : User Defined Wave Length
- phasetype : Phase Angle Type
- Θu : User Defined Phase Angle
- xu : User Defined Displacement
- tu : User Defined Time
- ztype : Height Above Seabed Type
- zhu : User Defined Height
- d : Water Depth
- H : Wave Height
- Um : Reference Velocity
- zm : Reference Height Above Seabed
Tool Output- Θ : Wave Phase Angle
- η : Wave Surface Relative To Mean Sea Level
- Ah : Wave Horizontal Acceleration
- Am : Wave Acceleration Magnitude
- Av : Wave Vertical Acceleration
- L : Wave Length
- T : Wave Period
- Vc : Current Velocity
- Vc/Vt : Current Velocity Over Horizontal Velocity Ratio
- Vh : Wave Horizontal Velocity
- Vm : Wave Velocity Magnitude
- Vt : Total Horizontal Velocity
- Vv : Wave Vertical Velocity
- c : Wave Celerity
- cvg : Convergence Check
- ro : Seabed Roughness
- zh : Height Above Seabed
- zs : Wave Surface Height Above Seabed
- zw : Wave Trough Height Above Seabed
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CALCULATOR : Ocean Wave Maximum Wave Height And Significant Wave Height [FREE] ±
Calculate ocean wave maximum wave height and significant wave height. The maximum wave height is assumed to be directly proportional to the significiant wave height. Tool Input- optype : Wave Spectrum Type
- htype : Wave Height Input Type
- H : Wave Height
Tool Output- Hm : Maximum Wave Height
- Hs : Significant Wave Height
- MoS : Maximum Height Over Significant Height
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CALCULATOR : Ocean Wave Spreading And Velocity Reduction Factor [FREE] ±
Calculate wave spreading and velocity reduction factor from heading and spreading factor. A relative heading of zero degrees is parallel to the structure, or ninety degrees is perpendicular to the structure. Small spreading factor factors are suitable for locally generated short crested "choppy" waves with multiple superimposed wave directions. Large spreading factors are suitable for long range uni directional waves with long crests. 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
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CALCULATOR : Ocean Wave And Current Seabed Velocity JONSWAP Wave [FREE] ±
Calculate wave and current seabed reduced velocity and acceleration from JONSWAP surface spectrum and heading. The JONSWAP surface spectrum can be used to calculate the significant wave velocity at or near the seabed. The calculation should not be used for elevations greater than half the water depth. Wave and current heading can be entered as relative heading (relative to the structure), or as absolute heading (relative heading equals difference in absolute heading to the struture). A relative heading of zero degrees is parallel to the structure, or ninety degrees is perpendicular to the structure. Tool Input- roughtype : Seabed Roughness Type
- zou : User Defined Seabed Roughness
- uctype : Current Velocity Type
- gatype : Gamma Factor Type
- Vr : Reference Current Velocity
- Zr : Reference Height Above Seabed
- 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
- Uc : Current Velocity
- Us : Significant Wave Velocity
- Ut : Wave And Current Combined Velocity
- cvg : Convergence Factor
- kw : Wave Number
- ro : Seabed Roughness
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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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CALCULATOR : Ocean Wave And Current Velocity From Return Period Data Airy Stokes And Cnoidal Wave [PLUS] ±
Calculate ocean wave and current velocity and acceleration from return period data using the Weibull, Gumbel or Frechet distributions. The current velocity is calculated at the design elevation from either the logarithmic profile or the 1/7th power law profile. The wave velocity and acceleration are calculated using either the Airy wave, Cnoidal wave or Stokes wave profile. Wave phase angle can be defined by angle, displacement (x distance), or time. The design elevation can be defined on the seabed, at the wave surface (calculated for the wave phase angle), the wave trough, or user defined design elevation. Enter data values as sets of four values separated by a comma (R, H, T, Vr), with each data set on a new line. Go to the bottom of the page to view the regression output. 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
- wavetype : Wave Type
- phasetype : Phase Angle Type
- Θu : User Defined Phase Angle
- x : User Defined Displacement
- t : User Defined Time
- ztype : Design Elevation Above Seabed Type
- Zu : User Defined Elevation
- Rdata : Return Period Data
- Hdata : Wave Height Data
- Tdata : Wave Period Data
- Udata : Current Velocity Data
- R : Design Return Period
- d : Water Depth
- Zr : Reference Elevation Above Seabed
Tool Output- Θ : Wave Phase Angle
- η : Wave Surface Relative To Mean Sea Level
- Ah : Wave Horizontal Acceleration At Design Elevation
- Am : Wave Acceleration Magnitude At Design Elevation
- Av : Wave Vertical Acceleration At Design Elevation
- Ho : Minimum Wave Height
- Hsm : Mean Wave Height
- Hw : Wave Height
- L : Wave Length
- Sc : Current Sample Period
- Sw : Wave Sample Period
- To : Minimum Wave Period
- Tpm : Mean Wave Period
- Tw : Wave Period
- Urm : Mean Current Velocity At Reference Elevation
- Vc : Current Velocity At Design Elevation
- Vc/Vht : Current Velocity Over Total Horizontal Velocity Ratio
- Vh : Wave Horizontal Velocity At Design Elevation
- Vht : Total Horizontal Velocity At Design Elevation
- Vm : Wave Velocity Magnitude At Design Elevation
- Vr : Current Velocity At Reference Elevation
- Vv : Wave Vertical Velocity At Design Elevation
- Z : Design Elevation Above Seabed
- Zs : Wave Surface Height Above Seabed
- Zw : Wave Trough Height Above Seabed
- c : Wave Celerity
- cvg : Convergence Factor
- ro : Seabed Roughness
- uo : Minimum Current Velocity At Reference Elevation
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CALCULATOR : Ocean Wave And Current Velocity From Return Period Data JONSWAP Spectrum [PLUS] ±
Calculate ocean wave and current seabed velocity and zero crossing period from return period data using the Weibull, Gumbel or Frechet distributions. The current velocity is calculated at the design elevation from 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 conditions 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
- 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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