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{{Short description|Enhanced tide due to ocean resonance}}
{{About|the oceanography
[[File:PortisheadDocks Tides.JPG|thumb|upright=1.5|Tides at [[Portishead, Somerset|Portishead]] Dock in the Bristol Channel. An example of tidal resonance.]]
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| editor-first = B.P.
| title = Tidal Hydrodynamics
|
| publisher = [[John Wiley & Sons]]
| pages = 883
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| pages = 44–46
| date = 2005
}}</ref> Other resonant regions with large tides include the [[Patagonian Shelf]] and on the
{{Cite journal
| last = Webb
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| title = A Model of Continental-shelf Resonances
| journal = Deep-Sea Research
| volume =
|
| pages = 1–15
| date = 1976
| doi = 10.1016/0011-7471(76)90804-4
}}</ref>▼
| bibcode = 1976DSRA...23....1W
▲ }}</ref>
Most of the resonant regions are also responsible for large fractions of the total amount of tidal energy dissipated in the oceans. Satellite altimeter data shows that the M<sub>2</sub> tide dissipates approximately 2.5 TW, of which 261 GW is lost in the [[Hudson Bay]] complex, 208 GW on the European Shelves (including the Bristol Channel), 158 GW on the North-west Australian Shelf, 149 GW in the [[Yellow Sea]] and 112 GW on the [[Patagonian Shelf]].<ref name=Egbert01>
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| pages = 22475–22502
| date = 2001
| issue = C10
|bibcode = 2001JGR...10622475E |doi = 10.1029/2000JC000699
| doi-access = free}}</ref>
==Scale of the Resonances==▼
The speed of long [[water waves|waves]] in the ocean is given, to a good approximation, by <math>\scriptstyle\sqrt{
{{Cite book
| last = Segar
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| pages = 598
}}</ref>
For a typical continental shelf with a depth of 100 m, the speed is approximately 30 m/s.
With a narrower shelf, there is still a resonance but it is mismatched to the frequency of the tides and so has less effect
In the deep ocean, where the depth is typically 4000 m, the speed of long waves increases to approximately 200 m/s.
The increased speed of long waves in the deep ocean means that the tidal wavelength there is of order 10,000 km.
{{Cite journal
| last = Platzman
| first = G.W.
|author2=Curtis, G.A. |author3=Hansen, K.S. |author4=Slater, R.D.
| title = Normal Modes of the World ocean.
| journal = [[Journal of Physical Oceanography]]
| volume = 11
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| pages = 579–603
| date = 1981
|bibcode = 1981JPO....11..579P |doi = 10.1175/1520-0485(1981)011<0579:NMOTWO>2.0.CO;2
}}
</ref><ref name=Webb73>
{{Cite journal
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| pages = 511
| date = 1973
|bibcode = 1973Natur.243..511W |doi = 10.1038/243511a0 | doi-access = free
}}</ref> In practice deep ocean resonances are difficult to observe, probably because the deep ocean loses tidal energy too rapidly to the resonant shelves.
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