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Mud floc observations in the turbidity maximum zone of the Scheldt estuary during neap tides Manning, A.J.; Martens, C.; De Mulder, T.; Vanlede, J.; Winterwerp, J.C.; Ganderton, P.; Graham, G.W. (2007). Mud floc observations in the turbidity maximum zone of the Scheldt estuary during neap tides. J. Coast. Res. Spec. Issue 50: 832-836 In: Journal of Coastal Research. Coastal Education and Research Foundation: Fort Lauderdale. ISSN 0749-0208; e-ISSN 1551-5036

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 145967 [ download pdf ] Waterbouwkundig Laboratorium: Open Repository 130417 [ OWA ]

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Trefwoorden

Particulates > Suspended particulate matter Sediments > Clastics > Mud Separation > Chemical precipitation > Flocculation Settling velocity Turbulent shear stresses

Author keywords

Flocculation; Turbulent shear stress; Suspended particulate matter; INSSEV instrument; settling velocity; mass settling flux

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Auteurs		Top
Manning, A.J. Martens, C. De Mulder, T. Vanlede, J., meer	Winterwerp, J.C. Ganderton, P. Graham, G.W.

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Abstract

Significant changes of sediment concentration and shear can occur within an estuarine turbidity maximum. Prediction of mud transport depends on a good specification of the settling velocity and the mass settling flux. This can only be achieved by using field measurements of floc settling dynamics that can be implemented in sediment transport models. This paper describes flocculation observations conducted during a neap tide in the Lower Scheldt Estuary. The data forms part of the Deurganckdok tidal dock field survey commissioned by the Flemish government. The findings showed that within the turbidity maximum zone the suspended sediment concentration reached 277 mg 1-1 and the floc mass distribution was bi-modal, with 80% of the population comprising macroflocs up to 507 micrometer in diameter. These macroflocs had individual settling velocities ranging from 1 to 11 mm s-1. In the turbidity maximum the macroflocs represented 88% of the floc mass, had a Wsmacro = 3.9 mm s-1 and contributed to 97% to the total settling flux. In contrast, at peak turbulence, the floc mass distribution was now weighted 58%:42% in favour of the smaller microflocs.

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