JONSWAP

JONSWAP ocean wave spectrum and realisation in time domain.

Usage

 jonswap hs tp [-n num_harmonics] [-g gamma] [-s seed] [-d duration] [-t timestep] [-v] [-h]

  hs: significant wave height in meters.
  tp: spectral peak period in seconds
  -n: number of harmonics used to discretise the spectrum.
  -g: value for gamma. If ommited, DNV is used.
  -s: seed number for phase randomisation.
  -d: duration - timetrace will be shown.
  -t: time step. default is 0.1 seconds.
  -v: verbose output
  -h: hide spectrum

The plot tool has the same call signature as jonswap.

Compile

No special dependencies required for the library and command line interface.

Main command line interface

make

Plots

For the plots, gnuplot_i is required. Copy /symlink gnuplot_i.c and gnuplot_i.h to the current directory

make plot

Mockup multithread performance implementation

make jonswap_multithread

Python

This repository has partial implementations in Python.

• jonswap.py: Calculates JONSWAP spectrum only. No time domain realisation.
• plots.py: Plot results from jonswap.c

Source

https://github.com/haphaeu/jonswap

License

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, version 2.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

Contact the author should you have any question.