Abstract
AbstractAlthough it has long been recognized that deposition along meandering rivers is not restricted to convex banks (i.e., point bars), the consensus is that sediment deposition on concave banks of channel bends mostly occurs when meander bends translate downstream because erosion-resistant barriers inhibit their lateral migration. Using a kinematic model of channel meandering and time lapse satellite imagery from the Mamoré River in Bolivia, we show that downstream translation and associated concave bank deposition are essential, autogenic parts of the meandering process, and resulting counter point bars are expected to be present whenever perturbations such as bend cutoffs and channel reoccupations create short bends with high curvatures. The implication is that zones of concave bank deposition with lower topography, finer-grained sediment, slack water, and riparian vegetation that differs from point bars are more common than previously considered.
Highlights
Meandering rivers are ubiquitous on the surface of the Earth and shaped the surface of Mars
In recent decades it has been increasingly recognized that deposition along concave banks and development of concave bank benches or counter point bars is common among many meandering rivers (Page and Nanson, 1982; Makaske and Weerts, 2005; Smith et al, 2011; Ielpi and Ghinassi, 2014; Durkin et al, 2015, 2017; Ghinassi et al, 2016)
Several modeling studies have emphasized that downstream migration is an intrinsic meandering process (e.g., Parker et al, 1982; Howard and Knutson, 1984; Sun et al, 1996; Chen and Duan, 2006), the implications of this idea for concave bank deposition and the development of counter point bars have not been explored in detail (Parker, 1996)
Summary
Meandering rivers are ubiquitous on the surface of the Earth and shaped the surface of Mars. Predicting channel migration and the related spatial distributions of erosion, sedimentation, and riparian vegetation is important for a series of problems like agricultural land management, bridge design, loss of real estate and infrastructure, stream restoration, and distribution of pore space in the resulting deposits and sedimentary rocks (e.g., Lorenz et al, 1985; Salo et al, 1986; Nakamura et al, 2014). While both modeling and observations suggest that the kinematics of Zoltan Sylvester 4890-4063 http://orcid.org/0000-0002-. Several modeling studies have emphasized that downstream migration is an intrinsic meandering process (e.g., Parker et al, 1982; Howard and Knutson, 1984; Sun et al, 1996; Chen and Duan, 2006), the implications of this idea for concave bank deposition and the development of counter point bars have not been explored in detail (Parker, 1996)
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