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Flocculation and settling velocity of fine sediment
Winterwerp, J.C.; Bale, A.J.; Christie, M.C.; Dyer, K.R.; Jones, S.; Lintern, D.G.; Manning, A.J.; Roberts, W. (2002). Flocculation and settling velocity of fine sediment, in: Winterwerp, J.C. et al. (Ed.) Fine sediment dynamics in the marine environment. Proceedings in Marine Science, 5: pp. 25-40
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.
In: Proceedings in Marine Science. Elsevier: New York. ISSN 1568-2692; e-ISSN 2352-2860
Peer reviewed article  

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  • Winterwerp, J.C.
  • Bale, A.J.
  • Christie, M.C.
  • Dyer, K.R.
  • Jones, S.
  • Lintern, D.G.
  • Manning, A.J.
  • Roberts, W.

Abstract
    This paper describes field and labaratory measurements of floc size and settling velocity of cohesive sediment in an estuarine environment and its modelling. The measurements and modelling showed a considerable variation in floc size, hence settling velocity over the tide, and over the spring-neap tide cycle. The simple flocculation model describes the evolution of floc size at one fraction only. The measurements, however, revealed the existence of a pronounced distribution in floc size, which varies over time. For instance, at the beginning of a flood period, hardly any macroflocs were observed in the field, whereas later in the tide, the fraction of macroflocs increased to about 45 to 80%. Also the structure of the flocs appeared to vary over the tide, though this may be caused by advection of sediment from other locations and/or bed erosion. In the labaratory experiments floc sizes and settling velocities similar to those observed in the field were obtained.

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