IMIS | Vlaams Instituut voor de Zee
 

Vlaams Instituut voor de Zee

Platform voor marien onderzoek

IMIS

Publicaties | Instituten | Personen | Datasets | Projecten | Kaarten
[ meld een fout in dit record ]mandje (0): toevoegen | toon Print deze pagina

Dynamics of concentrated benthic suspension layers
Winterwerp, J.C.; Bruens, A.W.; Gratiot, N.; Kranenburg, C.; Mory, M.; Toorman, E. A. (2002). Dynamics of concentrated benthic suspension layers, in: Winterwerp, J.C. et al. (Ed.) Fine sediment dynamics in the marine environment. Proceedings in Marine Science, 5: pp. 41-55
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., meer
In: Proceedings in Marine Science. Elsevier: New York. ISSN 1568-2692; e-ISSN 2352-2860, meer
Peer reviewed article  

Beschikbaar in  Auteurs 
    VLIZ: Open Repository 228242 [ OMA ]

Trefwoorden
    Buoyancy; Entrainment; Fluid mud; Menging (sedimenten); Zwevende sedimenten; Marien
Author keywords
    Concentrated Benthic Suspensions; fluid mud; entrainment; mixing; buyoancy

Project Top | Auteurs 
  • Prediction of cohesive sediment transport and bed dynamics in estuaries and coastal zones with integrated numerical simulation models, meer

Auteurs  Top 
  • Winterwerp, J.C., meer
  • Bruens, A.W.
  • Gratiot, N.
  • Kranenburg, C.
  • Mory, M.
  • Toorman, E. A., meer

Abstract
    This paper describes the dynamics of Concentrated Benthic Suspensions (CBS). CBS is defined as a suspension of cohesive sediment with a notable interaction between the sediment and the turbulent flow field through buoyancy effects, but still displaying near-Newtonian behaviour. The mechanisms which distinguish CBS from low-concentrated suspensions are described, and the focus is on the (hindered) settling and mixing processes. Experiments were carried out in an oscillating grid tank and in an rotating annular flume, simulating entrainment and mixing associated with the turbulent CBS-layer, as occur in tide-driven flows. It is shown that CBS can be modelled as a viscous fluid, and that the entrainment rates quantitatively match relations described in the literature on salt-fresh water induced stratified systems. Numerical simulations with one-dimensional vertical models using k-?: and Prandtl mixing length turbulence closures were carried out for hypothetical open channel flows to study the behaviour of CBS through sensitivity analyses. It is shown that high-concentrated mud suspensions may become saturated, generating a CBS-layer prior to the formation of fluid mud.

Alle informatie in het Integrated Marine Information System (IMIS) valt onder het VLIZ Privacy beleid Top | Auteurs