Matlab codes for directional wave spectra.

hi...

i'm doing my masters in ocean technology in India. kindly inform me about the available matlab routines for plotting of directional wave spectra, from directional waverider buoy data.

thank you

Abhinav K A.

Hello Abhinav K A.,

As much as I would like to help you, I am really not in a position to describe the plotting of the directional wave spectra from the Waverider.   This is because I am not familar with the formats of the Waverider's directional spectra.  I encourage you to contact the folks at Datawell, who probably can provide you with what you need.

Here is just as a little background for what we do here at Nortek:

The Nortek wave measuring instruments (AWAC, Aquadopp, Vector) are processed with either Storm or QuickWave softwares.  The directional spectra is presented graphically in the Storm software.  Quickwave outputs data as ASCII files which can subsequently be imported into MatLab for further processing/presentation. 

In order to present the Full Directional Spectra (for a single wave burst measurement) in MatLab the user would have to import both the Energy Density Spectra and the Normalized Directional Spectra.  These are two separate files that have all the wave burst data.  They are kept as separate files in order to minimize memory demands the Full Directional Spectra requires.

Presenting the Full Directional Spectrum (E) for a given wave burst requires simply calculating the product of the energy density spectra (S) with the normalized directional spectra (D).

E(f,theta) = S(f)*D(f,theta)

f = frequency

theta = direction

Good luck,

Torstein

thank you for the info. regarding directional wave spectra.

Abhinav.

Hi, I just want to add a comment for future person who want to do that kind of graph: you can have a look on polarplot3d, which is in the matlab file exchange:

http://www.mathworks.com/matlabcentral/fileexchange/13200-3d-polar-plot

have a nice day!