Calculate JONSWAP seabed significant wave velocity and zero upcrossing period from return period data using the Weibull, Gumbel or Frechet distributions.
The significant wave height and peak wave period are calculated from the significant wave height and peak wave period. The seabed velocity spectrum is calculated using an Airy wave transfer function. The calculation is optimised for seabed and near seabed elevations, and should not be used for elevations greater than half the water depth.
The regression data is displayed in the output view at the bottom of the page. Enter data values as sets of three values separated by a comma (R, H, T), with each data set on a new line. Data values can also be copied and pasted from a spreadsheet.
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
- 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