Editing Tidal resonance (section)

{{Short description|Enhanced tide due to ocean resonance}}
{{About|the oceanography phenomenon|usage in astronomy|Tidal locking}}

[[File:PortisheadDocks Tides.JPG|thumb|upright=1.5|Tides at [[Portishead, Somerset|Portishead]] Dock in the Bristol Channel. An example of tidal resonance.]]

In [[oceanography]], a '''tidal resonance''' occurs when the [[tide]] excites one of the [[resonance|resonant]] modes of the ocean.<ref name=Platzman91>
{{Citation
 | last = Platzman
 | first = G.W.
 | date = 1991
 | contribution =  Tidal Evidence for Ocean Normal Modes
 | editor-last = Parker
 | editor-first = B.P.
 | title = Tidal Hydrodynamics
 | location = New York
 | publisher = [[John Wiley & Sons]]
 | pages = 883
}}</ref>  
The effect is most striking when a [[continental shelf]] is about a quarter wavelength wide.  Then an incident tidal wave can be reinforced by reflections between the coast and the shelf edge, the result producing a much higher [[tidal range]] at the coast.

Famous examples of this effect are found in the [[Bay of Fundy]], where the world's highest tides are reportedly found, and in the [[Bristol Channel]].  Less well known is Leaf Bay, part of [[Ungava Bay]] near the entrance of [[Hudson Strait]] ([[Canada]]), which has tides similar to those of the [[Bay of Fundy]].<ref name=OReilly2005>
{{Cite journal
  | last = O'Reilly
  | first = C.T. 
  |author2=Solvason, R. |author3=Solomon, C. 
  | title = Where are the World's Largest Tides
  | journal = BIO Annual Report: 2004 in Review
  | editor = J. Ryan
  | publisher=Biotechnol. Ind. Org., Washington, D. C.
  | pages = 44–46
  | date = 2005
}}</ref>  Other resonant regions with large tides include the [[Patagonian Shelf]] and on the  continental shelf of [[northwest Australia]].<ref name=Webb76>
{{Cite journal
  | last = Webb
  | first = D.J. 
  | title = A Model of Continental-shelf Resonances
  | journal = Deep-Sea Research
  | volume = 23
  | issue = 1 
 | pages = 1–15
  | date = 1976
  | doi = 10.1016/0011-7471(76)90804-4
| 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&nbsp;TW, of which 261&nbsp;GW is lost in the [[Hudson Bay]] complex, 208&nbsp;GW on the European Shelves (including the Bristol Channel), 158&nbsp;GW on the North-west Australian Shelf, 149&nbsp;GW in the [[Yellow Sea]] and 112&nbsp;GW on the [[Patagonian Shelf]].<ref name=Egbert01>
{{cite journal
  | last = Egbert
  | first = G.D. 
  |author2= Ray, R. 
  | title = Estimates of M<sub>2</sub> tidal dissipation from TOPEX/Poseidon altimeter data
  | journal = Journal of Geophysical Research
  | volume = 106 (C10)
  | pages = 22475–22502
  | date = 2001
| issue = C10 
 |bibcode = 2001JGR...10622475E |doi = 10.1029/2000JC000699 | s2cid = 76652654 
 | doi-access = free}}</ref>