Flocculation settling characteristics of mud: sand mixtures

When natural muds become mixed with sandy sediments in estuaries, it has a direct effect on the flocculation process and resultant sediment transport regime. Much research has been completed on the erosion and consolidation of mud/sand mixtures, but very little is known quantitatively about how mixe...

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Bibliographic Details
Published in:Ocean dynamics 2010-04, Vol.60 (2), p.237-253
Main Authors: Manning, Andrew J, Baugh, John V, Spearman, Jeremy R, Whitehouse, Richard J. S
Format: Article
Language:English
Subjects:
Atmospheric Sciences
Brackish
Colleges & universities
Earth and Environmental Science
Earth Sciences
Environmental conditions
Estuaries
Flocculation
Fluid- and Aerodynamics
Geophysics/Geodesy
Marine
Marine environment
Monitoring/Environmental Analysis
Mud
Oceanography
Sand
Sediment transport
Settling velocity
Shear stress
Studies
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Summary:When natural muds become mixed with sandy sediments in estuaries, it has a direct effect on the flocculation process and resultant sediment transport regime. Much research has been completed on the erosion and consolidation of mud/sand mixtures, but very little is known quantitatively about how mixed sediments interact whilst in suspension, particularly in terms of flocculation. This paper presents the settling velocity findings from a recent laboratory study which examined the flocculation dynamics for three different mud/sand mixtures at different concentrations (0.2-5 g.l⁻¹) and turbulent shear stresses (0.06-0.9 Pa) in a mini-annular flume. The low intrusive video-based Laboratory Spectral Flocculation Characteristics instrument was used to determine floc/aggregate properties (e.g., size, settling velocity, density and mass) for each population. Settling data was assessed in terms of macrofloc (>160 μm) and microfloc (
ISSN:1616-7341
1616-7228
DOI:10.1007/s10236-009-0251-0