En:using ww3:2013 fall waves school : Différence entre versions

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: closing at 6 PM.   
: closing at 6 PM.   
* Dinner at 8 PM at "Aux Vieux Gréements" in Brest, port du Chateau  [ http://www.aux-vieux-greements.com/ ]
* Dinner at 8 PM at "Latitude crêpes" on the harbor of Brest [ http://www.blenoir.com/latitude-crepe.htm ]
* Tuesday 5: Physical parameterizations and numerics, 9 AM (lectures, Ifremer, Salon de l'Ocean)  
* Tuesday 5: Physical parameterizations and numerics, 9 AM (lectures, Ifremer, Salon de l'Ocean)  

Version du 25 octobre 2013 à 08:18

Example of unstructured grid and model results (color is wave height) for the French West Indies, case of 2013 Tropical storm Chantal. See http://www.previmer.org/previsions/vagues for real time forecasts and hindcast visualizations

For the organizers: our to-do list

aims and scope

The "waves school" will start on November 4 . It is intended for graduate students, post-docs, researchers, engineers or consultant that are dealing with ocean wave data of one form or another. The school will draw from the latest developments made possible by the IOWAGA, NOPP-waves, & Previmer, projects, and will benefit from the new (alpha) release of the WAVEWATCH III (R) version 4 from NOAA/NCEP.

Local information

To prepare your stay in Brest during the ww3 training course, please find here all the information you need. For any question, send email to mickael.accensi@ifremer.fr

Live streaming

The morning lectures will be streamed in live on youtube. We will do 2 or 3 videos per morning, depending on the program.

The youtube links for live streaming will be given each morning on this page. It will also be possible to watch them after. A listing will be done here.

click here for live


List of trainers

  • 01 Accensi, Mickael
  • 02 Alves Henrique
  • 03 Ardhuin, Fabrice
  • 04 Roland, Aron

List of registered trainees

  • 01 Barbariol, Francesco: confirmed
  • 02 Benetazzo, Alvise: confirmed
  • 03 Benshila, Rachid: confirmed
  • 04 Camarena, Amaury: confirmed
  • 05 Chailan, Romain: confirmed
  • 06 Gallagher, Sarah: confirmed
  • 07 Gautier, Caroline: confirmed
  • 08 Garnier, Valerie: confirmed
  • 09 Gualtieri, Lucia: confirmed (2 days only)
  • 10 Leckler, Fabien: confirmed
  • 11 Magne, Rudy: confirmed
  • 12 Mediavilla, Dernis: confirmed
  • 13 Michaud, Eloise: confirmed
  • 14 Mora Escalante, Rodney: confirmed
  • 15 Pallares, Elena: confirmed
  • 16 Pianezze, Joris: confirmed
  • 17 Perez, Jorge: confirmed
  • 18 Pein, Johannes: confirmed
  • 19 Rawat, Arshad: confirmed
  • 20 Sepulveda, Andres: confirmed
  • 21 Stutzmann, Eleonore: confirmed (2 days only)
  • 22 Veras Guimaraes, Pedro: confirmed

list for March 2014

  • 01 Mansal, Leon
  • 02 Yohia, Christophe

+ Many other people

code and tools versions

Matlab or Octave

Easy reading of NetCDF 4 requires a Matlab version R2010b or more recent. Otherwise you may transform NetCDF 4 in NetCDF 3 and use a Matlab version that is as old as 2008.

Andres Sepulveda has started to adapt some of our basic matlab tools for *Octave* (an open source alternative to Matlab). You may contact him directly. To read NetCDF files in octave you the toolbox octcdf, which uses a recent version, 3.4.X at least.


For visualization of model output (maps, time series ...) and mesh generation we will use a runtime version of IDL that will allow you to use our Wave Visualization and Analysis Tool . Please follow the indications on that page.

For this you need to register in the Exelis website, wait for an approval of your account, and then download IDL. It might take a few days for you account to be approved, so please register as soon as possible.


Polymesh is an interface to the grid generation tool Triangle. You will find details here .


The WW3 code version to be used is alpha-4.12, with a tar-ball kindly prepared by Henrique Alves. A request for access to this code version will be sent to NCEP this week (October 7). Due to US gov. shutdown, a temporary ftp site for download may be set up at Ifremer. However please read the licensing agreement and | this clarification by NCEP .

Because it is an "alpha" version, there are still a few things that need to be ironed out ... thank you for your patience. On this page you will find a list of known issues, and we keep finding more...

The manual (which is contained in the package) is available here . The cover page says it corresponds to version 4.08 updated on August 25, 2011 ... This is not true! It does correspond to version 4.12 and was updated on July 2013, but it is still incomplete and your feedback will be very useful for completing it and making it easier to read. First time users of WW3 should we warned that it is written backwards, and you should start at chapter 5 if you want to install the model and work your way backwards towards chapter 1. If you just want to know what is in the model and what it does then you can start at chapter 1.


The program is designed in such a way that people that only use wave data and do not want to run a model can attend day 1 & 2 while the real brave geeks that actually want to install WAVEWATCH III and run the thing will be welcome to stay until late Friday.

  • Monday 4, 9-10 AM, Ifremer, Salon de l'ocean: Welcome, coffee, logistics, discussion of participants objectives (e-mail discussions before Monday 4 are welcome): what do you want to acheive / understand with wave data and models.
  • Monday 4, morning, starting at 10 AM, Salon de l'Océan (lectures)
10:00 basic principles of ocean waves: elevations, velocities, pressure.... and spectra ( F. Ardhuin)
10:40 wave parameters: what can be measured and what is usually measured ( F. Ardhuin)
11:15 break
11:30 wave measurement databases: altimeter and SAR data, buoy data, seismic noise, IOWAGA & Previmer model databases ( 30': F. Ardhuin)
12:00 the NCEP hindcast and forecast database ( Henrique Alves)
12:30 examples of ocean engineering applications: long term statistics ... ( Michel Olagnon)
Lunch break 1 PM - 2 PM
  • Monday 4, afternon, starting at 2 PM (hands-on practical training: computer rooms at IUEM )
Model and data file formats: ASCII & NetCDF, reading tools. (M. Accensi)
Exercise starting from spectra, visualizing and recomputing integrated parameters
using long wave data time series (??)
reading wave model output and altimeter data, performing simple error analysis on wave models
coffee break from 4 PM to 4:30 PM & Posters
comparing ocean wave model or buoy data and seismic noise records
closing at 6 PM.
  • Tuesday 5: Physical parameterizations and numerics, 9 AM (lectures, Ifremer, Salon de l'Ocean)
the wave action equation and source terms, basic principles (H. Alves 40').
parameterizations in wave models and impacts on various quantities: from Hs to air-sea fluxes. Why results from

this WW3 different can be different from this or that version of WAM or SWAN. So why do we have different wave models? (F. Ardhuin 1h30 hours).

forcing fields: quality of wind fields, validation datasets
coffee break
wave model numerics: principles (A. Roland. 1 hour)
wave model numerics: the dark side of limiters, SWAN's "renormalization" .... (A. Roland, 50')
  • Tuesday 5: Physical parameterizations and numerics. afternoon (hands-on practical training)
analysis of different model hindcasts and different model resolutions. (spatial, possibly spectral too).
coffee break and posters from 4 PM to 4:30 PM.
evidence of discretization and numerical scheme effects on coastal wave model results
looking at directional spread
closing .. around 6 PM
  • Wednesday 6, morning (9 AM):
Installing and running WAVEWATCH III: code structure, pre-compilation, running the model: the basic steps, from ww3_grid to ww3_out* (H. Alves. 2 hours )
coffee break
introduction to grid types and multi-grid (F. Ardhuin 30').
specific aspects of unstructured grids (A. Roland & F. Ardhuin 1h)
lunch break (12:30 to 1:30 PM)
  • Wednesday 6, afternon (hands-on practical training)
setting up and running WW3 on single grids
coffee break and posters from 3:45 PM to 4:15 PM.
running a triangular mesh grid and using the results. From preprocessing to post-processing.
closing at 6 PM or before

  • Thursday 7, morning (9 AM, salon de l'océan)
grid generation for regular grids (H. Alves. 1 hour)
Running WW3 as a multi-grid system (M. Accensi. 1 hour)
coffee break
Mesh generation with polymesh (A. Roland. 40')
Mesh optimization for explicit schemes in WAVEWATCH III ( F. Ardhuin & A. Roland 40')
designing a mesh from scratch (with performance in mind) ( F. Ardhuin & A. Roland 40')
  • Thursday 7, afternoon: (hands-on practical training, computer rooms at IUEM )
one simple example with gridgen: a global + regional zoom
using polymesh
optimizing a mesh
  • Friday 8, morning, 9 AM (hands-on: salon de l'océan):
to be defined (possibly something more interactive on the different projects of the participants):
Coffee break (10h30 AM)
Finishing at 12h30


The material and tutorials will be accessible from this page (see links to different pages in the program above). You may already go to the page En:using_ww3_output

Additional resources