JONWSAP spectrum

Creates a JONWSAP density spectrum (one-sided), defined by its integral parameters.

Usage

jonswap(
  hs = 5,
  tp = 15,
  fmax = resourcecodedata::rscd_freq,
  df = NULL,
  gam = 3.3
)

Arguments

hs

Hs (default: 5m)

tp

Period (default: 10s)

fmax

higher frequency of the spectrum or vector of frequencies (default to resourcecode frequency vector)

df

frequency step (unused if fmax=vector of frequencies)

gam

peak enhancement factor (default: 3.3)

Value

Density spectrum with corresponding parameters

Details

Reference :

• O.G.Houmb and T.Overvik, "Parametrization of Wave Spectra and Long Term Joint Distribution of Wave Height and Period," in Proceedings, First International Conference on Behaviour of Offshore Structures (BOSS), Trondheim 1976. 23rd International Towing Tank Conference, vol. II, pp. 544-551

• ITTC Committee, 2002, "The Specialist Committee on Waves - Final Report and Recommendations to the 23rd ITTC", Proc. ITTC, vol. II, pp. 505-736.

Examples

S1 <- jonswap(tp = 15)
S2 <- jonswap(tp = 15, fmax = 0.95, df = 0.003)
plot(S1, type = "l", ylim = c(0, 72))
lines(S2, col = "red")
abline(v = 1 / 15)