Swell without direction

Comments

6 comments

  • Official comment
    Avatar
    Chris Kavallaris

    Hi Arthur and thanks for the insight. Checked with our weather provider and unfortunately, swell direction is not currently an available parameter. Would the direction of the wind waves or of the peak (primary) waves help?

    Comment actions Permalink
  • Avatar
    Arthur Ferreira dos Santos Neto

    Yes, it help! But we are talking about the amount of cinetic energy been conducted in a swell according the períod of the waves.  Here comes an exemple:  http://polar.ncep.noaa.gov/waves/viewer.shtml?-multi_1-latest-atlantic-tp_sw1-

    There are vectors showing the mean direction of swell.

    Regards

     

    0
    Comment actions Permalink
  • Avatar
    Chris Kavallaris

    Hi again Arthur. It seems that the NOAA WW3 model to which you linked does not provide mean direction of swell. The Product Viewer in the link provided is a bit confusing given that it states "primary swell peak period and mean direction", but most probably it means "primary swell peak period and primary wave mean direction". All we can say for sure is that the GRIB data files of the model do not contain such a parameter. We can consider to add the primary wave mean direction if it would help though. Let me know.

    Alex

    0
    Comment actions Permalink
  • Avatar
    Arthur Ferreira dos Santos Neto

    Well, primary swell, secondary swell and on, all them are important. But, very clear, all of it are moving along the oceans. From beginning to it's destiny, and it's described by a vector. Primary swell is suited to big vessels. The same way, secundary swell is suited to smaller vessels. And this dinamics allows the crew, or whohever, to make the rigth decision in the seas. To a great amout of mass moviment, it will be less important. But if has no energy enough all the ship will be rolling. 

    And, yes, it will help (primary swell peak period and primary wave mean direction vectors)!!! Just because it is the most significant parameter for risk in the  coast lines approaching and without it you should take the wrong decision, going to find wave breaks shallow ground in their way.

    I can say more about NOAA WW3 model. They are not confuse, they are very sharp in their future data forecast, mainly in long period swells (<15 sec). 
      

    0
    Comment actions Permalink
  • Avatar
    Arthur Ferreira dos Santos Neto

    About data files, they provide numerical forecast as well:

     http://polar.ncep.noaa.gov/waves/WEB/multi_1.latest_run/plots/multi_1.RECIFE.bull

    There are direction of each especific swell . Maybe it's a better model to embase our thought.

    0
    Comment actions Permalink
  • Avatar
    Chris Kavallaris

    Thank you Arthur, I will forward the information to the competent Department and inform you when I have news. Thanks again for your time and suggestions!

    0
    Comment actions Permalink

Please sign in to leave a comment.