NavList:

   

Reply

Hewitt wrote-

| Living here in the US Virgin Islands I've dabbled at it, but the tides
| here are not diurnal as they are on the US East Coast but more like
| what I've heard of the tides around England.

Those words puzzle me. I have a book here by a American named Marmer, from
1926, "The Tide". Which shows some predictions for Sandy Hook and New York
harbour. And those tides appear to be very semidiurnal (repeating after 12
hours or so), without much daily inequality, between am and pm tide. Those
are just like the tide pattern we have here in UK waters.

Is the pattern very different elsewhere on the US East Coast?

Hewitt added, about tables of luni-tidal intervals-

"In comparing this lunar method with the published tables, I noted that
there were often noticeable differences between what the table would
say and what I actually observed on the water. I figured this was
because the tables are generated by a computer which could not know
what the wind or barometer were going to be on the predicted day and
time. Both wind and barometric pressure affect the tide."

========================
That's certainly true, that weather can affect tide, but it most cases it
calls for rather extreme conditions to have an important effect. Predictions
of luni-tidal intervals are averaged over a wide range of conditions (most
important, phases), and for that reason do not predict tides well on a
particular day.

George.

contact George Huxtable, at  george@hux.me.uk
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.


--~--~---------~--~----~------------~-------~--~----~
Navigation List archive: www.fer3.com/arc
To post, email NavList@fer3.com
To , email NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---

   

Reply