On the formation of tide-produced seiches and double high waters in coastal seas

D. G. Bowers, R. G. Macdonald, D. McKee, W.A.M. Nimmo-Smith, G.W. Graham

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We describe a mechanism by which the tide, forcing a coastal water body, produces an oscillation at the natural period of the water body - a seiche - around the time of high water. The seiche appears as a distortion in the tidal curve which can, under certain conditions, produce a double high water. The formation of the seiche is explored with a numerical simulation of a sea strait, forced by the tide at its open ends. A seiche, of wavelength equal to twice the length of the strait, is formed when the mean depth of the strait is similar to the tidal range: the rapid reduction of friction as high water is approached appears to be an important part of the formation process. Observations of water level in the centre of a shallow sea strait in north Wales confirm that there is a residual oscillation around high water with the form of a damped seiche. The crest of the seiche occurs just before, and the trough just after, the maximum in the fitted tidal curve. The seiche slows the fall of the tide after high water and on one occasion, at neap tides, the fall is reversed and a double high water is formed. It is possible that this mechanism, hitherto unidentified, contributes to the formation of double high waters in other shallow coastal locations.

LanguageEnglish
Pages108–116
Number of pages9
JournalEstuarine, Coastal and Shelf Science
Volume143
DOIs
Publication statusPublished - 1 Dec 2013

Fingerprint

seiche
coastal water
tides
tide
strait
water
oscillation
Wales
tidal range
friction
body water
sea
wavelengths
surface water level
trough
water level
wavelength

Keywords

  • tides
  • seiches
  • double high waters
  • coastal seas

Cite this

Bowers, D. G. ; Macdonald, R. G. ; McKee, D. ; Nimmo-Smith, W.A.M. ; Graham, G.W. / On the formation of tide-produced seiches and double high waters in coastal seas. In: Estuarine, Coastal and Shelf Science. 2013 ; Vol. 143. pp. 108–116.
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On the formation of tide-produced seiches and double high waters in coastal seas. / Bowers, D. G.; Macdonald, R. G.; McKee, D.; Nimmo-Smith, W.A.M.; Graham, G.W.

In: Estuarine, Coastal and Shelf Science, Vol. 143, 01.12.2013, p. 108–116.

Research output: Contribution to journalArticle

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