Bedload tracing in a high‐sediment‐load mountain stream

Liébault, Frédéric; Bellot, Hervé; Chapuis, Margot; Klotz, Sébastien; Deschâtres, Michaël

doi:10.1002/esp.2245

Cited by 119 publications

(116 citation statements)

References 36 publications

(75 reference statements)

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“…2a). The corresponding distribution of travel distances is strongly skewed towards the direction of propagation, a feature commonly observed in field experiments (Liébault et al, 2012;Phillips and Jerolmack, 2014).…”

mentioning

confidence: 69%

“…Most field campaigns involve a few hundreds of tracer peebles at best (Liébault et al, 2012;Phillips and Jerolmack, 2014). As the tracers spread over kilometers, their concentration rapidly decreases to immeasurable levels.…”

Section: Location Size and Symmetry Of The Plumementioning

confidence: 99%

“…Liébault et al (2012), for instance, monitored the location of tracer pebbles deposited in the Bouinenc stream (France) during 2 years. Over this period, the motion of the tracers resulted from 55 floods, for a total 15 duration of 42 days.…”

mentioning

confidence: 99%

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Advection and dispersion of bedload tracers

Lajeunesse¹,

Devauchelle²,

James³

2017

Preprint

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We use the erosion-deposition model introduced by Charru et al. (2004) to simulate numerically the evolution of a plume of bedload tracers entrained by a steady flow. In this model, the propagation of the plume results from the stochastic exchange of particles between the bed and the bedload layer. We find a transition between two asymptotic regimes. At early time, the tracers, initially at rest, are progressively set into motion by the flow. During this entrainment regime, the plume, strongly skewed in 5 the direction of propagation, continuously accelerates while spreading non-linearly. With time, the skewness of the plume eventually reaches a maximum value before decreasing. This marks the transition to an advection-diffusion regime in which the plume becomes increasingly symmetrical, spreads linearly, and advances at constant velocity. We derive analytically the expressions of the position, the variance and the skewness of the plume, and investigate their asymptotic regimes. Our model assumes steady state. In the field, however, bedload transport is intermittent. We show that the asymptotic regimes become 10 insensitive to this intermittency when expressed in terms of the distance traveled by the plume. If this finding applies to the field, it might provide an estimate for the average bedload transport rate.

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mentioning

confidence: 69%

Section: Location Size and Symmetry Of The Plumementioning

confidence: 99%

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Advection and dispersion of bedload tracers

Lajeunesse¹,

Devauchelle²,

James³

2017

Preprint

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“…In the past, RFID tracking of natural sediment in streams has faced significant limitations due to the difficulty of drilling holes in natural sediment to imbed the PIT tags. Clasts very commonly failed structurally during drilling operations to insert a PIT tag or magnetic tracer (Liébault et al 2011;Hodge et al 2011), with failure rates of ∼66% reported by Bradley and Tucker (2012). Failure occurs in both soft sedimentary rocks (Liébault et al 2011) and crystalline rocks, which commonly fail along grain boundaries or metamorphic fabrics (Bradley and Tucker 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Clasts very commonly failed structurally during drilling operations to insert a PIT tag or magnetic tracer (Liébault et al 2011;Hodge et al 2011), with failure rates of ∼66% reported by Bradley and Tucker (2012). Failure occurs in both soft sedimentary rocks (Liébault et al 2011) and crystalline rocks, which commonly fail along grain boundaries or metamorphic fabrics (Bradley and Tucker 2012). There is a risk of serious injury from flying debris due to catastrophic failure of clasts during drilling.…”

Section: Introductionmentioning

confidence: 99%

New Gripping and Binding Device Greatly Improves Preparation of Natural Clasts for RFID Tracking

Slaven

Anders

2014

J. Hydraul. Eng.

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Scaling relationships between bed load volumes, transport distances, and stream power in steep mountain channels

Schneider

Turowski

Rickenmann

et al. 2014

J. Geophys. Res. Earth Surf.

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Bed load transport during storm events is both an agent of geomorphic change and a significant natural hazard in mountain regions. Thus, predicting bed load transport is a central challenge in fluvial geomorphology and natural hazard risk assessment. Bed load transport during storm events depends on the width and depth of bed scour, as well as the transport distances of individual sediment grains. We traced individual gravels in two steep mountain streams, the Erlenbach (Switzerland) and Rio Cordon (Italy), using magnetic and radio frequency identification tags, and measured their bed load transport rates using calibrated geophone bed load sensors in the Erlenbach and a bed load trap in the Rio Cordon. Tracer transport distances and bed load volumes exhibited approximate power law scaling with both the peak stream power and the cumulative stream energy of individual hydrologic events. Bed load volumes scaled much more steeply with peak stream power and cumulative stream energy than tracer transport distances did, and bed load volumes scaled as roughly the third power of transport distances. These observations imply that large bed load transport events become large primarily by scouring the bed deeper and wider, and only secondarily by transporting the mobilized sediment farther. Using the sediment continuity equation, we can estimate the mean effective thickness of the actively transported layer, averaged over the entire channel width and the duration of individual flow events. This active layer thickness also followed approximate power law scaling with peak stream power and cumulative stream energy and ranged up to 0.57 m in the Erlenbach, broadly consistent with independent measurements.

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Bedload tracing in a high‐sediment‐load mountain stream

Cited by 119 publications

References 36 publications

Advection and dispersion of bedload tracers

Advection and dispersion of bedload tracers

New Gripping and Binding Device Greatly Improves Preparation of Natural Clasts for RFID Tracking

Scaling relationships between bed load volumes, transport distances, and stream power in steep mountain channels

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