Title: Flocculation of fine-grained cohesive sediments developing multimodal particle size distributions: field investigation and mathematical modeling
Authors: Lee, Joon ×
Toorman, Erik
Fettweis, Michael #
Issue Date: 2014
Publisher: Springer-Verlag
Series Title: Ocean Dynamics vol:64 issue:3 pages:429-441
Article number: s10236
Abstract: Multimodal particle size distributions (PSDs) of fine-grained cohesive sediments are common in a marine and coastal environment. Curve-fitting software in this research decomposed such multimodal PSDs into subordinate log-normal PSDs. The four modal peaks, consisting of four-level ordered structures of primary particles, flocculi, microflocs and macroflocs, were identified and found to alternately rise and sink in a flow-varying tidal cycle due to shear-dependent flocculation. The four modal PSDs could further be simplified to two discrete size groups of flocculi and flocs. This allowed the develoment of a two class population balance equation (TCPBE) model with flocculi and flocs to simulate flocculation involving multimodal PSDs. The 1-dimensional vertical (1-DV) TCPBE model further incorporates the Navier-Stokes equation with the k-ε turbulence closure and the sediment mass balance equation. The model was able to reasonably simulate multimodal flocculation as well as turbulent flow and sediment transport in a flow-varying tidal cycle. The 1-DV TCPBE was concluded to be the simplest model that is capable of simulating multimodal flocculation in a turbulent flow field of a marine and coastal zone.
ISSN: 1616-7341
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Hydraulics Section
× corresponding author
# (joint) last author

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