Abstract
THE floor of the lower part of the estuary of Southampton Water (Fig. 1) has been examined with a Kelvin Hughes MS 43 transit sonar and an MS 36 echo sounder1. Upstream of Fawley the almost central deep channel is maintained by dredging to a least depth at low tide of about 11 m. On the western side the slope is a steady 1°–2°, but on the eastern side there is a wide shelf at about 2 m below port datum. To the seaward of Fawley there is a natural depth of 14 m below port datum. The sea bed consists of a soft mud made up of flocculated clay and fine silt particles. The flocculants have an equivalent mean grain size of about 5.5 Φ (22 µm). The mud is comparable with other marine muds having a moisture content of 120–220 per cent dry weight and a surface cohesion between 4–2 g cm−2. Occasional shell banks and gravel patches exist, especially near Calshot and on the eastern side.
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References
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Dyer, K. R., Rept. Challenger Soc., 3, No. 19 (1967).
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DYER, K. Linear Erosional Furrows in Southampton Water. Nature 225, 56–58 (1970). https://doi.org/10.1038/225056a0
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DOI: https://doi.org/10.1038/225056a0
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