Mixing caused by lateral internal seiching within a partially mixed estuary

The salinity fluctuations at an STD near the halocline in Southampton Water have been spectrally analysed. Mixing is shown to commence at a layer Richardson number of about 20. The predominant energy inputs have periods of 7–9 and 3·5–4·5 min. These motions arise from lateral internal seiching and i...

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Bibliographic Details
Published inEstuarine, coastal and shelf science Vol. 15; no. 4; pp. 443,IN5,453 - 452,IN6,457
Main Author Dyer, K.R.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.01.1982
Subjects
England coast
estuaries
internal waves
Marine
partially mixed estuary
Richardson Number
salinity variations
seiches
spectral analysis
England
internal waves
salinity variations
seiches
Richardson Number
spectral analysis
England coast
partially mixed estuary
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Summary:The salinity fluctuations at an STD near the halocline in Southampton Water have been spectrally analysed. Mixing is shown to commence at a layer Richardson number of about 20. The predominant energy inputs have periods of 7–9 and 3·5–4·5 min. These motions arise from lateral internal seiching and it is considered that they are produced by interaction of the surface seiche with the shallow side of the estuary. The wavelengths of the standing wave are calculated to be about 120 and 60 m respectively, and these compare well with echo-sounding surveys of the elevation of the halocline.
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ISSN:0272-7714
1096-0015
DOI:10.1016/0272-7714(82)90053-1