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    Re: Global oceanic tides, was: Navigating Around Hills and Dips in the Ocean
    From: Fred Hebard
    Date: 2003 Aug 16, 19:59 -0400

    Trevor,
    
    Tidal levels may be calculated, but have satisfactory descriptions of
    currents been acheived?  I believe George Huxtable was including both
    in his description.
    
    Fred Hebard
    
    On Friday, Aug 15, 2003, at 21:49 US/Eastern, Trevor J. Kenchington
    wrote:
    
    > George Huxtable wrote, after much snipping:
    >
    >> Because of the inertia of the immense water-masses involved, together
    >> with
    >> the obstruction caused by the continents (which restrict free flow
    >> from one
    >> ocean basin to another) the ocean surface can't, anywhere near,
    >> respond to
    >> these forces in the necessary time. Instead, the water swirls and
    >> surges
    >> around the ocean basins, in a pattern that's so complex that it defies
    >> calculation.
    >
    >
    > While computationally daunting, in the last ten years, cotidal charts
    > for the world ocean have been calculated from the astronomic tide
    > generating forces and the shapes of the ocean basins -- charts that
    > seem
    > to match quite well with empirical observations.
    >
    > Back when I was an oceanography student (nearly 30 years now) it was
    > quite impossible. The first realistic tidal model I encountered (for
    > part of the Tasman Sea) dated from the mid-1980s. By the mid- to
    > late-1990s, it was possible to do the whole ocean.
    >
    >
    > Trevor Kenchington
    >
    >
    > --
    > Trevor J. Kenchington PhD                         Gadus{at}iStar.ca
    > Gadus Associates,                                 Office(902) 889-9250
    > R.R.#1, Musquodoboit Harbour,                     Fax   (902) 889-9251
    > Nova Scotia  B0J 2L0, CANADA                      Home  (902) 889-3555
    >
    >                     Science Serving the Fisheries
    >                      http://home.istar.ca/~gadus
    >
    >
    
    
    

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