Abstract
Abstract Aggregation state significantly influences the size, density, and transport characteristics of fine sediment. Understanding sediment transport and deposition processes in the nation's navi...
Highlights
Sediment aggregates are composed of smaller particles bound by the cohesive forces of clay or organic material
The size and shape of these particles are similar to those previously reported as benthic fecal pellets in the James River (Moncure and Nichols 1968; Nichols 1972) and elsewhere
laser diffraction particle size analysis (LDPSA) results from Core 14 sediment showed that mineral particles >300 μm accounted for less than 1% of the sample volume, and the clasts seen in Fig. 4(b) are almost certainly aggregated
Summary
Sediment aggregates are composed of smaller particles bound by the cohesive forces of clay or organic material. Biological activity can result in the formation of aggregated particles in the form of fecal pellets that vary in size and density with the species of generation (Edelvang and Austen 1997; Wright et al 1997; Cutter and Diaz 2000; Schaffner et al 2001; Forsberg et al 2018). When consolidated cohesive beds are eroded, the erosion often occurs in the form of mud clasts, or bed aggregates, which have a particle density equal to that of the bed Such action is previously described as mass erosion (e.g., Mehta and McAnally 2008; Winterwerp et al 2012; Mehta 2013). This paper focuses mostly on the latter of the three types of aggregates, and the reader should assume that unless otherwise noted further reference to aggregated particles in this paper is to those of eroded bed aggregates
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