Migrating subaqueous dunes capture clay flocs
Sjoukje I. de Lange (HKV Lijn in Water, Wageningen University & Research)
Anne van der Wilk (Wageningen University & Research)
Claire Chassagne (TU Delft - Environmental Fluid Mechanics)
Waqas Ali (TU Delft - Environmental Fluid Mechanics)
Ton Hoitink (Wageningen University & Research)
Maximilian P. Born (RWTH Aachen University)
Kristian Brodersen (RWTH Aachen University)
Kryss Waldschläger (Wageningen University & Research)
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Abstract
Recent research highlights the abundance of floccule (flocs) in rivers (Nicholas, A. & Walling , 1996; Bungartz & Wanner, 2004; Lamb et al, 2020; Fetweis, 2008) formed by aggregation of clay particles with organic matter (Droppo, 2024; Dyer, 1989; Winterwerp, 2002; Mietta et al., 2009; Lasereva & Parfenova, 2023; Safar et al., 2022; Deng et al., 2019). These flocs affect the transport and the eventual fate of clay. Flocs exhibit distinct behaviour from the unflocculated sedimentary counterparts: they can deform and break, and have higher settling velocities (Lamb et al, 2020), which may in turn cause flocs to deposit and possibly interact with the riverbed (Lamb et al, 2020; Winterwerp et al., 2021; Baas et al., 2016)