Routing of Heterogeneous Sediments over Movable Bed: Model Verification

Vogel, Koen R.; Niekerk, Andre Van; Slingerland, Rudy; Bridge, J.

doi:10.1061/(asce)0733-9429(1992)118:2(263)

Cited by 35 publications

(14 citation statements)

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“…Downstream fining is a well-established relationship in river hydrology Vogel et al, 1992), and apparently even with the action of tides and waves that may winnow away the fines, downstream fining still appears to determine the grain size of deltas. Long rivers feed fine-grained muddy deltas, such as for the Amazon, Mekong, and Orinoco.…”

Section: Predictive Relationshipsmentioning

confidence: 99%

Morphodynamics of deltas under the influence of humans

Syvitski

Saito

2007

Global and Planetary Change

628

447

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Section: Predictive Relationshipsmentioning

confidence: 99%

Morphodynamics of deltas under the influence of humans

Syvitski

Saito

2007

Global and Planetary Change

628

447

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“…Paola et al, 1992;Robinson and Slingerland, 1998). One-dimensional models of multiple grain-size sediment transport in channels can be extremely sophisticated, solving the equations of unsteady, non-uniform flow in a channel with multiple grain sizes (e.g., Rahuel et al, 1989;Vogel et al, 1992;Cui et al, 1996), but their applicability to larger-scale networks is limited by high computational costs. Although their value is indisputable, onedimensional models suffer from the further restriction that they essentially isolate a small part of the landscape and are unable to capture the behaviour that results from drainage network-scale aggregation of sediment and water discharge.…”

Section: Introductionmentioning

confidence: 99%

Network‐scale dynamics of grain‐size sorting: implications for downstream fining, stream‐profile concavity, and drainage basin morphology

Gasparini

Tucker

Bras

2004

Earth Surf Processes Landf

101

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We explore the link between channel-bed texture and river basin concavity in equilibrium catchments using a numerical landscape evolution model. Theory from homogeneous sediment transport predicts that river basin concavity directly increases with bed sediment size. If the effective grain size on a river bed governs its concavity, then natural phenomena such as grain-size sorting and channel armouring should be linked to concavity. We examine this hypothesis by allowing the bed sediment texture to evolve in a transport-limited regime using a two grain-size mixture of sand and gravel. Downstream fining through selective particle erosion is produced in equilibrium. As the channel-bed texture adjusts downstream so does the local slope. Our model predicts that it is not the texture of the original sediment mixture that governs basin concavity. Rather, concavity is linked to the texture of the sorted surface layer. Two different textural regimes are produced in the experiments: a transitional regime where the mobility of sand and gravel changes with channel-bed texture, and a sanddominated region where the mobility of sand and gravel is constant. The concavity of these regions varies depending on the median gravel-or sand-grain size, erosion rate, and precipitation rate. The results highlight the importance of adjustments in both surface texture and slope in natural rivers in response to changes in fluvial and sediment inputs throughout a drainage network. This adjustment can only be captured numerically using multiple grain sizes or empirical downstream fining rules.

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“…A number of numerical models have been developed to fulfill this necessity. They include those of Hirano (1971), Bettess and White (1981), Ribberink (1987), Armanini (1989), Holly and Rahuel (1990), Parker and Sutherland (1990), Di Silvio (1991), Van Niekerk et al (1992) , Vogel et al (1992), and US Army Corps of Engineers (1993). In addition, the numerical models of Parker (1991a,b), Hoey and Ferguson (1994) and Paola and Seal (1995) were developed expressly for the purpose of studying downstream fining.…”

Section: Introductionmentioning

confidence: 99%