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dc.contributor.authorHassan, Marwan A.
dc.contributor.authorSaletti, Matteo
dc.contributor.authorZhang, Chendi
dc.contributor.authorFerrer Boix, Carles
dc.contributor.authorJohnson, Joel P. L.
dc.contributor.authorMüller, Tobias
dc.contributor.authorvon Flotow, Claudia
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental
dc.identifier.citationHassan, M. A. [et al.]. Co-evolution of coarse grain structuring and bed roughness in response to episodic sediment supply in an experimental aggrading channel. "Earth surface processes and landforms", Març 2020, vol. 45, núm. 4, p. 948-961.
dc.descriptionThis is the accepted version of the following article: [Hassan, M. A., Saletti, M., Zhang, C., Ferrer‐Boix, C., Johnson, J. P. L., Müller, T., and von Flotow, C. ( 2020) Co‐evolution of coarse grain structuring and bed roughness in response to episodic sediment supply in an experimental aggrading channel. Earth Surf. Process. Landforms, 45: 948– 961.], which has been published in final form at
dc.description.abstractWe use flume experiments to better understand how gravel-bed channels maintain bed surface stability in response to pulses of sediment supply. Bed elevations and surface imagery at high spatial resolutions were used to quantify the co-evolution of surface grain-size distribution (GSD), bed roughness statistics, and bed surface structures (clusters, cells and transverse features). Using a new semi-automated method, we identified individual stone structures over a 2 m × 1 m area throughout the experiments. After an initial coarsening, surface GSD and armouring ratio remained nearly stable as sediment pulses caused net bed aggradation. In contrast, individual grain structures continued to form, increase or decrease in size, and disappear throughout the experiments. The response of the bed to sediment pulses depended on the history of surface roughness evolution and bed surface structure development, as these factors changed much more in response to supply perturbations earlier in the experiments compared to later, even as the bed continued to aggrade. We interpret that the dynamic production and destruction of bed surface structures can act as a ‘buffer’ to sediment supply pulses, maintaining a stable bed surface during aggradation with minimal change in grain size or armouring.
dc.format.extent14 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria civil::Enginyeria hidràulica, marítima i sanitària::Canals i regadius
dc.subjectÀrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia
dc.subject.lcshRiver channels
dc.subject.lcshSediment transport
dc.subject.otherBedload transport
dc.subject.otherGravel bed
dc.subject.otherChannel stability
dc.titleCo-evolution of coarse grain structuring and bed roughness in response to episodic sediment supply in an experimental aggrading channel
dc.subject.lemacSediments (Geologia) -- Transport
dc.subject.lemacCanals (Enginyeria hidràulica)
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (author's final draft)
local.citation.authorHassan, M. A.; Saletti, M.; Zhang, C.; Ferrer-Boix, C.; Johnson, J.; Müller, T.; von Flotow, C.
local.citation.publicationNameEarth surface processes and landforms

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