Sedimentary rates driven by laboratory lock-exchange turbidity currents flowing over gravel and vegetated beds

Turbidity currents are key agents in sediment transport and bed reshaping, influencing geological records, organic carbon fluxes and pollutant transport. While extensively studied over smooth beds, their interaction with rough beds, such as gravel or vegetated substrates, remains poorly understood....

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Authors: Serra Putellas, Teresa, Soler i Ortega, Marianna, Mancini, Mirco, Solari, Luca, Colomer, Jordi
Format: article
Status:Published version
Publication Date:2025
Country:España
Institution:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repository:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:10256/27692
Online Access:http://hdl.handle.net/10256/27692
Access Level:Open access
Keyword:Sedimentació
Sedimentation and deposition
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spelling Sedimentary rates driven by laboratory lock-exchange turbidity currents flowing over gravel and vegetated bedsSerra Putellas, TeresaSoler i Ortega, MariannaMancini, MircoSolari, LucaColomer, JordiSedimentacióSedimentation and depositionTurbidity currents are key agents in sediment transport and bed reshaping, influencing geological records, organic carbon fluxes and pollutant transport. While extensively studied over smooth beds, their interaction with rough beds, such as gravel or vegetated substrates, remains poorly understood. Existing studies suggest bed roughness slows flow and alters deposition, but a comprehensive understanding of how grain-size affects current dynamics and sedimentation patterns is lacking. In this study, we addressed key knowledge gaps on the influence of bed roughness and vegetation on turbidity current dynamics and sedimentation by conducting a comprehensive series of lock-exchange flume experiments. Six bed grain-sizes, multiple flow depths, and sediment concentrations were tested and compared with previous experiments on simulated and real vegetation. Results demonstrate that increasing bed roughness significantly reduces turbidity current velocity and enhances near-source sediment deposition. Greater deposits close to the source result in more non-uniform sediment distribution, with less deposition along the gravel bed. Conversely, smooth beds facilitate longer sediment transport and more uniform deposition. Flow regimes were observed to shift from inertial to drag-dominated as a function of bed configuration, with vegetated and coarse-grained beds inducing comparable hydraulic resistance. Sediment deposition patterns were closely linked to bed roughness and influenced clogging processes via unimpeded static percolation. Overall, the findings reveal a strong feedback between substrate morphology and turbidity current behaviour, with important implications for turbidite formation, sedimentary structure development, and hyporheic exchange dynamicsThis study was funded by the Ministerio de Economía y Competitividad of the Spanish Government through Grant PID2024-155974OB-I00. Open Access funding provided thanks to the CRUE-CSIC agreement with ElsevierElsevier2025info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionpeer-reviewedapplication/pdfhttp://hdl.handle.net/10256/27692Sedimentary Geology, 2025, vol. 489, art.núm. 106978Articles publicats (D-F)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)Inglésinfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.sedgeo.2025.106978info:eu-repo/semantics/altIdentifier/issn/0037-0738info:eu-repo/semantics/altIdentifier/eissn/1879-0968PID2024-155974OB-I00Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:recercat.cat:10256/276922026-05-29T05:05:01Z
dc.title.none.fl_str_mv Sedimentary rates driven by laboratory lock-exchange turbidity currents flowing over gravel and vegetated beds
title Sedimentary rates driven by laboratory lock-exchange turbidity currents flowing over gravel and vegetated beds
spellingShingle Sedimentary rates driven by laboratory lock-exchange turbidity currents flowing over gravel and vegetated beds
Serra Putellas, Teresa
Sedimentació
Sedimentation and deposition
title_short Sedimentary rates driven by laboratory lock-exchange turbidity currents flowing over gravel and vegetated beds
title_full Sedimentary rates driven by laboratory lock-exchange turbidity currents flowing over gravel and vegetated beds
title_fullStr Sedimentary rates driven by laboratory lock-exchange turbidity currents flowing over gravel and vegetated beds
title_full_unstemmed Sedimentary rates driven by laboratory lock-exchange turbidity currents flowing over gravel and vegetated beds
title_sort Sedimentary rates driven by laboratory lock-exchange turbidity currents flowing over gravel and vegetated beds
dc.creator.none.fl_str_mv Serra Putellas, Teresa
Soler i Ortega, Marianna
Mancini, Mirco
Solari, Luca
Colomer, Jordi
author Serra Putellas, Teresa
author_facet Serra Putellas, Teresa
Soler i Ortega, Marianna
Mancini, Mirco
Solari, Luca
Colomer, Jordi
author_role author
author2 Soler i Ortega, Marianna
Mancini, Mirco
Solari, Luca
Colomer, Jordi
author2_role author
author
author
author
dc.subject.none.fl_str_mv Sedimentació
Sedimentation and deposition
topic Sedimentació
Sedimentation and deposition
description Turbidity currents are key agents in sediment transport and bed reshaping, influencing geological records, organic carbon fluxes and pollutant transport. While extensively studied over smooth beds, their interaction with rough beds, such as gravel or vegetated substrates, remains poorly understood. Existing studies suggest bed roughness slows flow and alters deposition, but a comprehensive understanding of how grain-size affects current dynamics and sedimentation patterns is lacking. In this study, we addressed key knowledge gaps on the influence of bed roughness and vegetation on turbidity current dynamics and sedimentation by conducting a comprehensive series of lock-exchange flume experiments. Six bed grain-sizes, multiple flow depths, and sediment concentrations were tested and compared with previous experiments on simulated and real vegetation. Results demonstrate that increasing bed roughness significantly reduces turbidity current velocity and enhances near-source sediment deposition. Greater deposits close to the source result in more non-uniform sediment distribution, with less deposition along the gravel bed. Conversely, smooth beds facilitate longer sediment transport and more uniform deposition. Flow regimes were observed to shift from inertial to drag-dominated as a function of bed configuration, with vegetated and coarse-grained beds inducing comparable hydraulic resistance. Sediment deposition patterns were closely linked to bed roughness and influenced clogging processes via unimpeded static percolation. Overall, the findings reveal a strong feedback between substrate morphology and turbidity current behaviour, with important implications for turbidite formation, sedimentary structure development, and hyporheic exchange dynamics
publishDate 2025
dc.date.none.fl_str_mv 2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
peer-reviewed
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10256/27692
url http://hdl.handle.net/10256/27692
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.sedgeo.2025.106978
info:eu-repo/semantics/altIdentifier/issn/0037-0738
info:eu-repo/semantics/altIdentifier/eissn/1879-0968
PID2024-155974OB-I00
dc.rights.none.fl_str_mv Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv Sedimentary Geology, 2025, vol. 489, art.núm. 106978
Articles publicats (D-F)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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