En:using ww3:2013 fall waves school

Révision de 8 novembre 2013 à 06:42 par Fa1e926 (discussion | contributions) (Program)

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.

Live streaming

The morning lectures will be streamed in live on youtube. We will do 4 or 5 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

update the page if no video available.. stay tuned !

thursday lecture:


The program was 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. It is thus broken into :

Waves 101: wave data and measurements
Waves 201: principles of the action balance, parameterizations, impact on model results
Waves 301: running the wave model
Triangles 101: running on triangular meshes
Triangles 201: triangle mesh generation and optimization.
Project: let's see how to apply all this for your own project.

Please follow links for slides, videos, and tutorial material.

  • Monday 4, 9-10 AM, Ifremer, Salon de l'ocean: Welcome, coffee, logistics, discussion of participants objectives (e-mail discussions before 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: satellites, buoys, seismic noise and models , an Ifremer perspective (F. Ardhuin)
12:00 wave parameters: the NCEP hindcast and forecast database ( Henrique Alves)
12:30 examples of ocean engineering applications: long term statistics ... ( Michel Olagnon) recorded on YouTube
Lunch break 1 PM - 2 PM
  • Monday 4, afternon, starting at 2 PM (hands-on practical training: computer rooms B011 and B012 at IUEM )
Working with modelled and measured wave data
coffee break from 4 PM to 4:30 PM & Posters
reading and plotting maps of wave parameters
closing at 6 PM.

  • Tuesday 5: Physical parameterizations and numerics, (lectures, Ifremer, Salon de l'Ocean)
09:00 The (first) 31 -year reanalysis of waves at NCEP using CFSR winds (H. Alves) .
09:30 data freely available from NCEP (H. Alves).
09:40 the wave action equation and source terms, basic principles (H. Alves).
10:15 Effects of parameterizations on wave model results (F. Ardhuin).
11:15 coffee break
10:45 Effects of forcing fields (winds, currents ...) on wave model results (F. Ardhuin)
11:30 wave model numerics: principles and dirty tricks (A. Roland and F. Ardhuin)
12:15 Installing and running WAVEWATCH III: from ww3_grid to ww3_out* (H. Alves. )
13:00 Lunch break

  • Tuesday 5: Physical parameterizations and numerics. afternoon (hands-on practical training: rooms B011 and B012 at IUEM )
13:30 comparing modeled and measured seismic noise records
13:45 model validation with altimeter data
16:00 coffee break and posters
16:45 using python for analysing NCEP's wave data, including ensemble forecasts
17:00 Basic setup and compilation of WW3
closing .. around 6 PM

  • Wednesday 6, morning:
09:00 Installing and running WAVEWATCH III: continued (H. Alves)
10:00 introduction to grid types and multi-grid (F. Ardhuin).
10:30 coffee break
10:50 specific aspects of unstructured grids (A. Roland & F. Ardhuin)
11:20 grid generation for regular grids (H. Alves)
12:20 lunch break
  • Wednesday 6, afternon (hands-on practical training)
13:00 Example on Lake Victoria
13:30 First step on ww3 wiki and caparmor use
15:45 coffee break and posters
16:30 running a triangular mesh
17:30 grid generation (gridgen: regular grids)
midnight gridgen (continued) and running the multigrid
closing at 6 PM or before

  • Thursday 7, morning (9 AM, salon de l'océan)
09:00 Running WW3 as a multi-grid system (M. Accensi)
09:40 Mesh generation with polymesh (A. Roland, F. Ardhuin)
10:15 Mesh optimization for explicit schemes in WAVEWATCH III ( F. Ardhuin)
10:30 coffee break
11:30 designing a mesh from scratch (with performance in mind) ( F. Ardhuin & A. Roland 40')
12:10 Lunch Break
  • Thursday 7, afternoon: (hands-on practical training, computer rooms at IUEM B011 and B012 )
13:15 using polymesh for triangle mesh generation
15:45 coffee break
16:15 optimizing a mesh
  • Friday 8, morning (hands-on: salon de l'océan). We will be available from 8:30 to 12:30 AM. But that is your day: you decide on the program.
08:30 Helping around with your projects (mesh or grid generation ...), installation on your laptop / cluster ...
10:30 Coffee break
10:50 Continued + your feedback (how effective this was, possible other topics of interest: coupling to atmospheric or circulation models, more applied topics like marine energy, sediment transport, extreme analysis ... )
12:30 Finishing (lunch is possible at Ifremer)


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 24-28 March 2014

  • 01: Mansal, Leon
  • 02: Yohia, Christophe
  • 03: Toulany, Bechara
  • ...: Many other people
  • 19: up to 19 participants

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. An update has just been produced (October 25) to take into account quite a few bug fixes. It is distributed to all the participants present in Brest.

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.


All material (slides) and tutorials are accessible from this page (follow the links). The slides and tarred tutporials are all on this ftp folder. Additional necessary tools will be handed over to local participants and can generally be found, : here. If something is missing (we're humans), let us know.

The only outside material is :

  • the WAVEWATCH III code (contact H. Alves at NCEP)
  • Matlab (see the Mathworks)
  • IDL runtime licence: see exelis

You can also navigate our wiki pages (use the search menu), for example; En:using_ww3_output

Additional resources

Practical information: transportation, lodging ...

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