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The turbidity maximum in a mesotidal estuary, the Tamar Estuary, UK: II. The floc properties
Dyer, K.R.; Bale, A.J.; Christie, M.C.; Feates, N.; Jones, S.; Manning, A.J. (2002). The turbidity maximum in a mesotidal estuary, the Tamar Estuary, UK: II. The floc properties, in: Winterwerp, J.C. et al. (Ed.) (2002). Fine sediment dynamics in the marine environment. Proceedings in Marine Science, 5: pp. 219-232
In: Winterwerp, J.C.; Kranenburg, C. (Ed.) (2002). Fine sediment dynamics in the marine environment. Proceedings in Marine Science, 5. Elsevier: Amsterdam. ISBN 0-444-51136-9. XV, 713 pp., more
In: Proceedings in Marine Science. Elsevier: Amsterdam. ISSN 1568-2692, more
Peer reviewed article

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Keyword
    Marine
Author keywords
    Flocculation; settling velocity; floc size; turbulence; suspended sediment concentration; turbidity maximum; Tamar Estuary

Authors  Top 
  • Dyer, K.R.
  • Bale, A.J.
  • Christie, M.C.
  • Feates, N.
  • Jones, S.
  • Manning, A.J., more

Abstract
    Measurements have been carried out in the turbidity maximum of the Tamar Estuary at neap and spring tides of floc size, settling velocity and effective density. These measurements were complemented by suspended sediment concentration and turbulence profiles. The overall dynamics of the turbidity maximum have been presented in the companion paper (Part I), and form a context for the results presented here. The floc size increased from about 50 to about 350 microns across the turbidity maximum, and settling velocity changed from 0.0-6.0mms-1. The equivalent change in floc effective density was 50-750kgm-3. Within the turbidity maximum the proportion of macroflocs (>160 microns) increased. The changes in floc properties were correlated with changes in concentration and the turbulence parameter G, the root mean square of the gradient in turbulent velocity fluctuations. An empirical equation representing the settling velocity Ws (mms-1) in terms of SPM (mgl-1 ) and G (s-1) is: Ws = -0.243 + 0.000567SPM + 0.981G - 0.0934G².

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