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Significance of aggregation of fine sediment particles in their deposition
McAnally, W.H.; Mehta, A.J. (2002). Significance of aggregation of fine sediment particles in their deposition. Est., Coast. and Shelf Sci. 54(4): 643-653
In: Estuarine, Coastal and Shelf Science. Academic Press: London; New York. ISSN 0272-7714, more
Peer reviewed article  

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Keywords
    Cohesive sediment; Cohesive sediments; Estuaries; Flocculation; Sediment transport; INE, USA, California, San Francisco Bay [Marine Regions]; Marine

Authors  Top 
  • McAnally, W.H.
  • Mehta, A.J.

Abstract
    The significance of aggregation processes, by which the properties of suspended fine sediment particles or flocs change during transport, is examined for the simple case of deposition of estuarine sediments in a flume. A multi-class model for aggregation processes is combined with a one-dimensional, unsteady, multi-class sediment transport model to calculate the deposition rate for two flume experiments-one with no recirculation of a medium-cohesion sediment, and the other in which a high-cohesion sediment was recirculated by pumping. The results show that while aggregation processes had a moderate effect on the rate of deposition of medium-cohesion sediment, they dominated high-cohesion sediment deposition. The results also suggest that multi-class fine sediment aggregation-plus-deposition calculations will produce more realistic results than single-class calculations in estuaries where sediment exhibits a high degree of cohesion and variability in flow-induced shearing.

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