Mixing caused by lateral internal seiching within a partially mixed estuary |
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| Authors: | KR Dyer |
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| Institution: | Institute of Oceanographic Sciences, Taunton, U.K. |
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| Abstract: | 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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| Keywords: | internal waves seiches salinity variations spectral analysis Richardson Number partially mixed estuary England coast |
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