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Co-evolution of coarse grain structuring and bed roughness in response to episodic sediment supply in an experimental aggrading channel

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hdl:2117/180704

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Hassan, Marwan A.
Saletti, Matteo
Zhang, Chendi
Ferrer Boix, CarlesMés informacióMés informacióMés informació
Johnson, Joel P. L.
Müller, Tobias
von Flotow, Claudia
Document typeArticle
Defense date2020-03
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
We 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.
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This 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. https://doi.org/10.1002/esp.4788], which has been published in final form at https://onlinelibrary.wiley.com/doi/abs/10.1002/esp.4788
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. 
URIhttp://hdl.handle.net/2117/180704
DOI10.1002/esp.4788
ISSN0197-9337
Publisher versionhttps://onlinelibrary.wiley.com/doi/abs/10.1002/esp.4788
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