Question on the difference between the long distance, like 2000 mile, California ground swell that follows a southward current. To a close hurricane swell that's like 200 miles away with a gulf stream currant. I know nothing of wave period and that's why I'm asking. What's faster with the same wave height California or Hurricane ?
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Thread: Wave Period

Sep 6, 2017, 11:00 PM #1Senior Member
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Wave Period

Sep 6, 2017, 11:56 PM #2Senior Member
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Period is period...period. But I think you are making a good point on the opposing currents having an effect on period.

Sep 7, 2017, 12:23 AM #3Junior Member
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Wave current should have little to no impact on swell. The gulf stream moves at most 1.5 mph and waves of this size move much, much faster, a swell with hurricane period like Irma in the next few days of 16 secs would be traveling around 54mph in deep water. The continental shelf will play a far greater role than anything the EC will see current wise.

Sep 7, 2017, 12:41 AM #4Senior Member
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Sep 7, 2017, 01:56 AM #5Senior Member
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16 second period from the east or the west is the same. If it comes from 2000 miles or 1200 miles if it's 16 seconds it's 16 seconds. The currents play a small part in diminishing period true. And, continental shelf, canyons etc have an affect but not sure that is what op is asking

Sep 7, 2017, 01:58 AM #6Senior Member
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Actually just reread op. 200 mile and 2000 mile swells would be nearly impossible to have similar swell dynamic so SIS is on the right track

Sep 7, 2017, 04:34 AM #7Member
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For deep water, the relationship between speed and wavelength is given by the formula:
l = g x t x t / (2 x pi)
l = t x c for all kinds of waves, substitute in above equation: t x c = g x t x t / (2 x pi)
c = g x t / (2 x pi) or t = c x 2 x pi / g or t = c x 0.641 (s)
where t= wave period (sec), f= wave frequency, l= wave length (m) and pi=3.1415...
to calculate c and l from wave period t (in sec): c = t x 1.56 m/s= t x 5.62 km/hr = t x 3.0 knot
l = 1.56 x t x t (metres)
Thus waves with a period of 10 seconds, travel at 56 km/hr with a wave length of about 156m. A 60 knot (110 km/hr) gale can produce in 24 hours waves with periods of 17 seconds and wave lengths of 450m. Such waves travel close to the wind's speed (97 km/hr). A tsunami travelling at 200 m/s has a wave period of 128 s, and a wave length of 25,600 m.
The website below has tons of information about open ocean waves and how they move.....
http://www.seafriends.org.nz/oceano/waves.htm

Sep 7, 2017, 11:44 AM #8Senior Member
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Sep 7, 2017, 12:19 PM #9
wait 54mph wave , ride that cowboy yowza

Sep 7, 2017, 12:24 PM #10Senior Member
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