The variability of antidune morphodynamics on steep slopes

Steep streams on rough beds are generally characterised by supercritical flow condi-tions under which antidunes can develop and migrate over time. In this paper, wepresent flume experiments that we conducted to investigate the variability ofantidune geometry and migration celerity, a variability obs...

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Autores: Pascal, Iván, Ancey, Christophe, Bohórquez, Patricio
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Institución:Universidad de Jaén
Repositorio:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
OAI Identifier:oai:ruja.ujaen.es:10953/1335
Acceso en línea:https://doi.org/10.1002/esp.5110
https://hdl.handle.net/10953/1335
Access Level:acceso abierto
Palabra clave:Antidune
Bedform variability
Bedload transport
Flume experiments
Paleohydraulics
Rivermorphodynamics
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spelling The variability of antidune morphodynamics on steep slopesPascal, IvánAncey, ChristopheBohórquez, PatricioAntiduneBedform variabilityBedload transportFlume experimentsPaleohydraulicsRivermorphodynamicsSteep streams on rough beds are generally characterised by supercritical flow condi-tions under which antidunes can develop and migrate over time. In this paper, wepresent flume experiments that we conducted to investigate the variability ofantidune geometry and migration celerity, a variability observed even under steady-state conditions. Quantifying this variability is important for river morphodynamics, hydraulics and paleohydraulics. We imposed moderate to intense bedload transportrates at the flume inlet to assess their effects on antidune morphodynamics for near-constant values of the mean bed slope. The bed elevation profile was monitored foreach experiment with high spatial and temporal resolution. Upstream migrating anti-dunes were observed along most of the flume length. Considering single values forwavelength and celerity was not sufficient to describe the antidune behaviour inthese experiments. By using spectral analysis, we identified the variability ranges ofbedform shape and celerity. Interestingly, migration celerity increased with increasingantidune wavelength; the opposite trend was reported for dunes in other studies.Antidunes were more uniform and migrated faster for higher sediment feeding rates.Scaling the spectra made it possible to find a general dimensionless relationshipbetween antidune wavelength and celerity. This framework provides a novel methodfor estimating the mean bedload transport rate in the presence of upstream migratingantidune.Ministerio de Ciencia e Innovaci on de España,Grant/Award Number: CGL2015-70736-RWiley202320232021info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://doi.org/10.1002/esp.5110https://hdl.handle.net/10953/1335reponame:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaéninstname:Universidad de JaénInglésEarth Surface Processes and Landforms 2021; 46: 1750–1765Atribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:ruja.ujaen.es:10953/13352026-06-24T12:41:07Z
dc.title.none.fl_str_mv The variability of antidune morphodynamics on steep slopes
title The variability of antidune morphodynamics on steep slopes
spellingShingle The variability of antidune morphodynamics on steep slopes
Pascal, Iván
Antidune
Bedform variability
Bedload transport
Flume experiments
Paleohydraulics
Rivermorphodynamics
title_short The variability of antidune morphodynamics on steep slopes
title_full The variability of antidune morphodynamics on steep slopes
title_fullStr The variability of antidune morphodynamics on steep slopes
title_full_unstemmed The variability of antidune morphodynamics on steep slopes
title_sort The variability of antidune morphodynamics on steep slopes
dc.creator.none.fl_str_mv Pascal, Iván
Ancey, Christophe
Bohórquez, Patricio
author Pascal, Iván
author_facet Pascal, Iván
Ancey, Christophe
Bohórquez, Patricio
author_role author
author2 Ancey, Christophe
Bohórquez, Patricio
author2_role author
author
dc.subject.none.fl_str_mv Antidune
Bedform variability
Bedload transport
Flume experiments
Paleohydraulics
Rivermorphodynamics
topic Antidune
Bedform variability
Bedload transport
Flume experiments
Paleohydraulics
Rivermorphodynamics
description Steep streams on rough beds are generally characterised by supercritical flow condi-tions under which antidunes can develop and migrate over time. In this paper, wepresent flume experiments that we conducted to investigate the variability ofantidune geometry and migration celerity, a variability observed even under steady-state conditions. Quantifying this variability is important for river morphodynamics, hydraulics and paleohydraulics. We imposed moderate to intense bedload transportrates at the flume inlet to assess their effects on antidune morphodynamics for near-constant values of the mean bed slope. The bed elevation profile was monitored foreach experiment with high spatial and temporal resolution. Upstream migrating anti-dunes were observed along most of the flume length. Considering single values forwavelength and celerity was not sufficient to describe the antidune behaviour inthese experiments. By using spectral analysis, we identified the variability ranges ofbedform shape and celerity. Interestingly, migration celerity increased with increasingantidune wavelength; the opposite trend was reported for dunes in other studies.Antidunes were more uniform and migrated faster for higher sediment feeding rates.Scaling the spectra made it possible to find a general dimensionless relationshipbetween antidune wavelength and celerity. This framework provides a novel methodfor estimating the mean bedload transport rate in the presence of upstream migratingantidune.
publishDate 2021
dc.date.none.fl_str_mv 2021
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1002/esp.5110
https://hdl.handle.net/10953/1335
url https://doi.org/10.1002/esp.5110
https://hdl.handle.net/10953/1335
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Earth Surface Processes and Landforms 2021; 46: 1750–1765
dc.rights.none.fl_str_mv Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
dc.source.none.fl_str_mv reponame:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
instname:Universidad de Jaén
instname_str Universidad de Jaén
reponame_str RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
collection RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
repository.name.fl_str_mv
repository.mail.fl_str_mv
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