Bedload transport in rivers, size matters but so does shape

Cassel, Mathieu; Lavé, Jérôme; Recking, Alain; Malavoi, Jean‐Réné; Piégay, Hervé

doi:10.1038/s41598-020-79930-7

Cited by 25 publications

(12 citation statements)

References 49 publications

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“…The overall variance of mean tracer velocities explained by particle properties was about 7%, most of it being explained by sphericity (6.99%), which exhibited a positive coefficient and contributed to explaining particle velocity. This is consistent with previous in-flume tracking experiments (Cassel, Lavé, et al, 2021).…”

Section: Drivers Of Particle Motion and Prediction Of Virtual Mobilitysupporting

confidence: 94%

“…The straight section of the channel was chosen for to installation of The tracers seeded at the beginning of the 2020 field campaign were artificial pebbles (Figure 2a) composed of a mixture of polyurethane resin and corundum (Cassel, Piégay, & Lavé, 2017;Cassel, Lavé, et al, 2021). They were equipped with active transponders of a-UHF tags.…”

Section: Bedload Monitoring Equipmentmentioning

confidence: 99%

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Assessment of pebble virtual velocities by combining active RFID fixed stations with geophones

Cassel

Navrátil

Liébault

et al. 2023

Earth Surf Processes Landf

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Monitoring bedload transport in rivers is a challenging research domain teeming with technical innovations and methodological developments aimed at improving our knowledge and models of bedload processes at different spatial–temporal scales. Radio frequency identification (RFID) technology has improved sediment tracking, allowing the characterisation of transport processes of individual particles at flood‐event scales. Meanwhile, geophone sensors have enabled the long‐term continuous monitoring of seismic signals that can provide surrogate measures of bedload fluxes at local scales, during flood events and at sediment‐pulses. The combination of these two techniques could allow sediment transport processes to be linked with both flood events and sediment pulses. In this study, we used a combination of active ultra‐high frequency RFID technology and geophone monitoring stations to link the virtual velocity of tracers with seismic activity, hydraulic forcing, and the properties of the tracked particles. Single and multiple regression models show that seismic activity best explained the observed variance (81%) of the virtual velocity of particles, in comparison with discharge (58%) and stream power (63%). Furthermore, when several control variables (seismic activity and particle properties) were combined in an empirical model, the model explained 89% of the variance and allowed quantification of the portions of the variance explained by hydraulic forcing, geophonic activity and tracked particles. These results show the high potential of these combined monitoring techniques for future in‐field experiments to investigate bedload processes at different spatiotemporal scales in rivers of different morphologies.

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Section: Drivers Of Particle Motion and Prediction Of Virtual Mobilitysupporting

confidence: 94%

Section: Bedload Monitoring Equipmentmentioning

confidence: 99%

Assessment of pebble virtual velocities by combining active RFID fixed stations with geophones

Cassel

Navrátil

Liébault

et al. 2023

Earth Surf Processes Landf

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“…Beyond bed grain size, there is an opportunity to expand the collection of sediment characteristics important for describing geomorphic processes. For example, sediment shape and arrangement on the bed also play an important role in sediment transport processes (Cassel et al, 2021). Embeddedness is a known indicator of habitat quality (Jones et al, 2012) and is the most common bed material characteristic measured in a review of assessment procedures (Papangelakis et al, 2023).…”

Section: Bed Structurementioning

confidence: 99%

Measuring geomorphology in river assessment procedures 2: Recommendations for supporting river management goals

Papangelakis

Hassan

Luzi

et al. 2023

J American Water Resour Assoc

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Fluvial geomorphology, which describes the form and processes of rivers, is increasingly being incorporated into river assessment procedures. However, the complexity of geomorphic processes makes a single universal and standardized assessment protocol a challenging and possibly impractical task. In this paper, we present a set of recommendations for choosing appropriate river assessment procedures and measuring geomorphic indicators to effectively capture important geomorphic processes required to support river management goals. We outline steps for building a river assessment procedure based on an adaptive approach rather than a one‐size‐fits‐all approach, where the geomorphic indicators, spatial and temporal scale, and methodologies used are carefully chosen based on the goals of the management project; the assessment aims to support. Guidance for choosing the appropriate geomorphic indicators is based on their significance (usefulness in characterizing the system), ease of measurement, and temporal scale needs. We also present recommendations on measurement techniques for each indicator while highlighting recent technological and methodological advancements that help overcome resource challenges often faced in river assessment. Given the wealth of scientific and technological developments in the field of geomorphology, it is possible to improve how geomorphic form and function are measured and incorporated into river assessments that support watershed management goals.

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“…4), 𝜌𝜌 = characteristic particle size (typically expressed as a grain diameter, and the subscript 'c' denotes critical and refers to the shear stress value above which a particle would start moving (incipient motion). It has long been recognized that particle shape also affects its mobility and recent work has provided new insights into its implications (e.g., Cassel et al, 2021;Deal et al, 2023). To account for grain shape effects in bed load sediment mobility, Deal et al, (2023) introduced a shape-corrected Shields number (𝐶𝐶 * 𝜇𝜇 * ⁄ )𝜏𝜏 𝑐𝑐 * where 𝐶𝐶 * is an effective drag coefficient, and 𝜇𝜇 * is an average bulk friction coefficient.…”

Section: Basic Principles Of Sediment Transportmentioning

confidence: 99%

Plastic as a Sediment – A Universal and Objective practical solution to growing ambiguity in plastic litter classification schemes

Russell¹,

Pohl²,

Fernández³

2023

Preprint

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There is a universal and growing challenge of ambiguity in plastic classification schemes, which affects the predictability of plastic accumulation in all environments world-wide. Plastic pollution is an ever-growing global issue, and understanding plastic items and their sedimentological relationship is a solution to this increasing concern. Definitions of micro- meso- and macro- plastic is inconsistent between studies, as are categories of plastic, and the properties recorded. This is understandable because every project has a different objective, but the consequence is that different studies are not laterally relatable. It is widely agreed that as a community, we need a system that has room for specialism of study but has an objective basis that can allow for inter-project and inter-disciplinary collaborations. By considering plastic as a sediment, we can outline an objective and quantifiable classification scheme that builds on the principles of sedimentology for use in plastic studies, such that we can better understand why plastics accumulate where they do. This is importantly not just another classification scheme, but a philosophically grounded solution to a long-standing challenge that is set to be of increasing significance. Additionally, whilst these advances may be of immediate usefulness to the scientist interested in plastic transport and accumulation, the environmental scientist or biologist will find that these philosophies and classification scheme will aid to quantitatively support and compliment aligning data. Through this, our new plastic and sediment environment can be further understood both spatially and temporally, and connected to other studies. We outline the key philosophies of sedimentology and use these to: i) unify and define plastic size classification from nano-scale to mega- and introduce giga- scale; ii) we outline a shape classification that can tackle simple through to complex shapes; iii) we discuss and demonstrate the importance of total density over polymer density; and iv) we discuss the importance of material properties. In using this classification scheme, we can relate any plastic item to any other item, and to itself over time. This manuscript contains a summary and worksheet that can be used in the field or in a laboratory to utilise this scheme and present objectively comparable results. We are confident that the philosophies presented here will be of use to the plastic research community, such that we can integrate plastic studies with longstanding and deeply understood sedimentological knowledge, thereby enhancing our understanding of plastic routing and accumulation in the environment.

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Bedload transport in rivers, size matters but so does shape

Cited by 25 publications

References 49 publications

Assessment of pebble virtual velocities by combining active RFID fixed stations with geophones

Assessment of pebble virtual velocities by combining active RFID fixed stations with geophones

Measuring geomorphology in river assessment procedures 2: Recommendations for supporting river management goals

Plastic as a Sediment – A Universal and Objective practical solution to growing ambiguity in plastic litter classification schemes

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