Sediment undulations on the Llobregat prodelta: Signs of early slope instability or sedimentary bedforms?
A field of sediment undulations has been mapped by means of high resolution multibeam bathymetry and seismic reflection profiles in the Llobregat River prodelta, off the city of Barcelona, Catalonia, Spain. Similar features had previously been recognized in other prodelta environments and interprete...
| Autores: | , , , , , , , , , , , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2007 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/47272 |
| Acceso en línea: | https://hdl.handle.net/2445/47272 |
| Access Level: | acceso abierto |
| Palabra clave: | Sediments fluvials Llobregat, Delta del (Catalunya)) River sediments Llobregat River Delta (Catalonia) |
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Sediment undulations on the Llobregat prodelta: Signs of early slope instability or sedimentary bedforms?Urgeles Esclasans, RogerDe Mol, BenLiquete García, CaminoCanals Artigas, MiquelDe Batist, MarcHughes-Clarke, John E.Amblàs i Novellas, DavidArnau, Pedro A.Calafat Frau, AntoniCasamor Bermúdez, José LuisCentella, VíctorDe Rycker, KoenFabrés Francés, JoanFrigola Ferrer, Jaime I.Lafuerza, SaraLastras Membrive, GaldericSanchez-Vidal, AnnaZúñiga, DianaVersteeg, WimWillmott Puig, VerónicaSediments fluvialsLlobregat, Delta del (Catalunya))River sedimentsLlobregat River Delta (Catalonia)A field of sediment undulations has been mapped by means of high resolution multibeam bathymetry and seismic reflection profiles in the Llobregat River prodelta, off the city of Barcelona, Catalonia, Spain. Similar features had previously been recognized in other prodelta environments and interpreted either as downslope sediment deformation or sedimentary structures induced by bottom currents or hyperpycnal flows. Since the study area is undergoing significant offshore development, proper interpretation of such sediment undulations is needed for a correct risk assessment. The occurrence of the sediment undulations is restricted to the prodelta front on slope gradients between 3 and 0.2º. The undulations have developed at the edge and atop an area of gas bearing sediments within the Late-Holocene high-stand mud wedge. An evaluation is made of the characteristics of the sediment undulations in order to determine the most likely process for the origin of these structures. Amongst these characteristics are the continuity of the reflections and lack of diffractions in between different undulations, their size distribution (large to small) both from shallow to deep and with depth in section, the asymmetry (decreasing from proximal to distal), the crest to trough vertical distance on the landward side of the undulations (up to 0.5 m), and the lack of features that could indicate a progressive movement such as growth structures and drag folds. These characteristics indicate that the sediment undulations on the Llobregat River prodelta do not result from sediment deformation, but rather from the interaction of bottom currents generated by hyperpycnal flows from the Llobregat River with regional sea water circulation. Their identification as sediment waves implies that such features do not pose a major hazard for urther offshore development.American Geophysical Union2013201320072013info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/47272Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: http://dx.doi.org/10.1029/2005JB003929Journal of Geophysical Research, 2007, vol. 112, p. B05102http://dx.doi.org/10.1029/2005JB003929(c) American Geophysical Union, 2007info:eu-repo/semantics/openAccessoai:recercat.cat:2445/472722026-05-29T05:05:01Z |
| dc.title.none.fl_str_mv |
Sediment undulations on the Llobregat prodelta: Signs of early slope instability or sedimentary bedforms? |
| title |
Sediment undulations on the Llobregat prodelta: Signs of early slope instability or sedimentary bedforms? |
| spellingShingle |
Sediment undulations on the Llobregat prodelta: Signs of early slope instability or sedimentary bedforms? Urgeles Esclasans, Roger Sediments fluvials Llobregat, Delta del (Catalunya)) River sediments Llobregat River Delta (Catalonia) |
| title_short |
Sediment undulations on the Llobregat prodelta: Signs of early slope instability or sedimentary bedforms? |
| title_full |
Sediment undulations on the Llobregat prodelta: Signs of early slope instability or sedimentary bedforms? |
| title_fullStr |
Sediment undulations on the Llobregat prodelta: Signs of early slope instability or sedimentary bedforms? |
| title_full_unstemmed |
Sediment undulations on the Llobregat prodelta: Signs of early slope instability or sedimentary bedforms? |
| title_sort |
Sediment undulations on the Llobregat prodelta: Signs of early slope instability or sedimentary bedforms? |
| dc.creator.none.fl_str_mv |
Urgeles Esclasans, Roger De Mol, Ben Liquete García, Camino Canals Artigas, Miquel De Batist, Marc Hughes-Clarke, John E. Amblàs i Novellas, David Arnau, Pedro A. Calafat Frau, Antoni Casamor Bermúdez, José Luis Centella, Víctor De Rycker, Koen Fabrés Francés, Joan Frigola Ferrer, Jaime I. Lafuerza, Sara Lastras Membrive, Galderic Sanchez-Vidal, Anna Zúñiga, Diana Versteeg, Wim Willmott Puig, Verónica |
| author |
Urgeles Esclasans, Roger |
| author_facet |
Urgeles Esclasans, Roger De Mol, Ben Liquete García, Camino Canals Artigas, Miquel De Batist, Marc Hughes-Clarke, John E. Amblàs i Novellas, David Arnau, Pedro A. Calafat Frau, Antoni Casamor Bermúdez, José Luis Centella, Víctor De Rycker, Koen Fabrés Francés, Joan Frigola Ferrer, Jaime I. Lafuerza, Sara Lastras Membrive, Galderic Sanchez-Vidal, Anna Zúñiga, Diana Versteeg, Wim Willmott Puig, Verónica |
| author_role |
author |
| author2 |
De Mol, Ben Liquete García, Camino Canals Artigas, Miquel De Batist, Marc Hughes-Clarke, John E. Amblàs i Novellas, David Arnau, Pedro A. Calafat Frau, Antoni Casamor Bermúdez, José Luis Centella, Víctor De Rycker, Koen Fabrés Francés, Joan Frigola Ferrer, Jaime I. Lafuerza, Sara Lastras Membrive, Galderic Sanchez-Vidal, Anna Zúñiga, Diana Versteeg, Wim Willmott Puig, Verónica |
| author2_role |
author author author author author author author author author author author author author author author author author author author |
| dc.subject.none.fl_str_mv |
Sediments fluvials Llobregat, Delta del (Catalunya)) River sediments Llobregat River Delta (Catalonia) |
| topic |
Sediments fluvials Llobregat, Delta del (Catalunya)) River sediments Llobregat River Delta (Catalonia) |
| description |
A field of sediment undulations has been mapped by means of high resolution multibeam bathymetry and seismic reflection profiles in the Llobregat River prodelta, off the city of Barcelona, Catalonia, Spain. Similar features had previously been recognized in other prodelta environments and interpreted either as downslope sediment deformation or sedimentary structures induced by bottom currents or hyperpycnal flows. Since the study area is undergoing significant offshore development, proper interpretation of such sediment undulations is needed for a correct risk assessment. The occurrence of the sediment undulations is restricted to the prodelta front on slope gradients between 3 and 0.2º. The undulations have developed at the edge and atop an area of gas bearing sediments within the Late-Holocene high-stand mud wedge. An evaluation is made of the characteristics of the sediment undulations in order to determine the most likely process for the origin of these structures. Amongst these characteristics are the continuity of the reflections and lack of diffractions in between different undulations, their size distribution (large to small) both from shallow to deep and with depth in section, the asymmetry (decreasing from proximal to distal), the crest to trough vertical distance on the landward side of the undulations (up to 0.5 m), and the lack of features that could indicate a progressive movement such as growth structures and drag folds. These characteristics indicate that the sediment undulations on the Llobregat River prodelta do not result from sediment deformation, but rather from the interaction of bottom currents generated by hyperpycnal flows from the Llobregat River with regional sea water circulation. Their identification as sediment waves implies that such features do not pose a major hazard for urther offshore development. |
| publishDate |
2007 |
| dc.date.none.fl_str_mv |
2007 2013 2013 2013 |
| 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://hdl.handle.net/2445/47272 |
| url |
https://hdl.handle.net/2445/47272 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
Reproducció del document publicat a: http://dx.doi.org/10.1029/2005JB003929 Journal of Geophysical Research, 2007, vol. 112, p. B05102 http://dx.doi.org/10.1029/2005JB003929 |
| dc.rights.none.fl_str_mv |
(c) American Geophysical Union, 2007 info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
(c) American Geophysical Union, 2007 |
| eu_rights_str_mv |
openAccess |
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application/pdf |
| dc.publisher.none.fl_str_mv |
American Geophysical Union |
| publisher.none.fl_str_mv |
American Geophysical Union |
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Articles publicats en revistes (Dinàmica de la Terra i l'Oceà) reponame:Recercat. Dipósit de la Recerca de Catalunya instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Recercat. Dipósit de la Recerca de Catalunya |
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Recercat. Dipósit de la Recerca de Catalunya |
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