Sediment dynamics in the subaquatic channel of the Rhone delta (Lake Geneva, France/Switzerland)

With its smaller size, well-known boundary conditions, and the availability of detailed bathymetric data, Lake Geneva's subaquatic canyon in the Rhone Delta is an excellent analogue to understand sedimentary processes in deep-water submarine channels. A multidisciplinary research effort was und...

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Detalhes bibliográficos
Autores: Corella, Juan Pablo, Arantegui, A.
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2014
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/378697
Acesso em linha:http://hdl.handle.net/10261/378697
Access Level:acceso abierto
Palavra-chave:Subaquatic channel
Sedimentary processes
Rhone delta
Levee architecture
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spelling Sediment dynamics in the subaquatic channel of the Rhone delta (Lake Geneva, France/Switzerland)Corella, Juan PabloArantegui, A.Subaquatic channelSedimentary processesRhone deltaLevee architectureWith its smaller size, well-known boundary conditions, and the availability of detailed bathymetric data, Lake Geneva's subaquatic canyon in the Rhone Delta is an excellent analogue to understand sedimentary processes in deep-water submarine channels. A multidisciplinary research effort was undertaken to unravel the sediment dynamics in the active canyon. This approach included innovative coring using the Russian MIR submersibles, in situ geotechnical tests, and geophysical, sedimentological, geochemical and radiometric analysis techniques. The canyon floor/levee complex is characterized by a classic turbiditic system with frequent spillover events. Sedimentary evolution in the active canyon is controlled by a complex interplay between erosion and sedimentation processes. In situ profiling of sediment strength in the upper layer was tested using a dynamic penetrometer and suggests that erosion is the governing mechanism in the proximal canyon floor while sedimentation dominates in the levee structure. Sedimentation rates progressively decrease down-channel along the levee structure, with accumulation exceeding 2.6 cm/year in the proximal levee. A decrease in the frequency of turbidites upwards along the canyon wall suggests a progressive confinement of the flow through time. The multi-proxy methodology has also enabled a qualitative slope-stability assessment in the levee structure. The rapid sediment loading, slope undercutting and over-steepening, and increased pore pressure due to high methane concentrations hint at a potential instability of the proximal levees. Furthermore, discrete sandy intervals show very high methane concentrations and low shear strength and thus could correspond to potentially weak layers prone to scarp failures. © 2013 Springer Basel.Springer NatureConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2025202520142025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/378697reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1007/s00027-013-0309-4Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3786972026-05-22T06:33:51Z
dc.title.none.fl_str_mv Sediment dynamics in the subaquatic channel of the Rhone delta (Lake Geneva, France/Switzerland)
title Sediment dynamics in the subaquatic channel of the Rhone delta (Lake Geneva, France/Switzerland)
spellingShingle Sediment dynamics in the subaquatic channel of the Rhone delta (Lake Geneva, France/Switzerland)
Corella, Juan Pablo
Subaquatic channel
Sedimentary processes
Rhone delta
Levee architecture
title_short Sediment dynamics in the subaquatic channel of the Rhone delta (Lake Geneva, France/Switzerland)
title_full Sediment dynamics in the subaquatic channel of the Rhone delta (Lake Geneva, France/Switzerland)
title_fullStr Sediment dynamics in the subaquatic channel of the Rhone delta (Lake Geneva, France/Switzerland)
title_full_unstemmed Sediment dynamics in the subaquatic channel of the Rhone delta (Lake Geneva, France/Switzerland)
title_sort Sediment dynamics in the subaquatic channel of the Rhone delta (Lake Geneva, France/Switzerland)
dc.creator.none.fl_str_mv Corella, Juan Pablo
Arantegui, A.
author Corella, Juan Pablo
author_facet Corella, Juan Pablo
Arantegui, A.
author_role author
author2 Arantegui, A.
author2_role author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Subaquatic channel
Sedimentary processes
Rhone delta
Levee architecture
topic Subaquatic channel
Sedimentary processes
Rhone delta
Levee architecture
description With its smaller size, well-known boundary conditions, and the availability of detailed bathymetric data, Lake Geneva's subaquatic canyon in the Rhone Delta is an excellent analogue to understand sedimentary processes in deep-water submarine channels. A multidisciplinary research effort was undertaken to unravel the sediment dynamics in the active canyon. This approach included innovative coring using the Russian MIR submersibles, in situ geotechnical tests, and geophysical, sedimentological, geochemical and radiometric analysis techniques. The canyon floor/levee complex is characterized by a classic turbiditic system with frequent spillover events. Sedimentary evolution in the active canyon is controlled by a complex interplay between erosion and sedimentation processes. In situ profiling of sediment strength in the upper layer was tested using a dynamic penetrometer and suggests that erosion is the governing mechanism in the proximal canyon floor while sedimentation dominates in the levee structure. Sedimentation rates progressively decrease down-channel along the levee structure, with accumulation exceeding 2.6 cm/year in the proximal levee. A decrease in the frequency of turbidites upwards along the canyon wall suggests a progressive confinement of the flow through time. The multi-proxy methodology has also enabled a qualitative slope-stability assessment in the levee structure. The rapid sediment loading, slope undercutting and over-steepening, and increased pore pressure due to high methane concentrations hint at a potential instability of the proximal levees. Furthermore, discrete sandy intervals show very high methane concentrations and low shear strength and thus could correspond to potentially weak layers prone to scarp failures. © 2013 Springer Basel.
publishDate 2014
dc.date.none.fl_str_mv 2014
2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/378697
url http://hdl.handle.net/10261/378697
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1007/s00027-013-0309-4
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Springer Nature
publisher.none.fl_str_mv Springer Nature
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
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