Sediment characteristics and internal architecture of offshore sand ridges on a tideless continental shelf (western Mediterranean)
15 pages, 13 figures
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| Format: | artículo biblioteca |
| Language: | English |
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British Society for Geomorphology
2020-11
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| Subjects: | Bedforms, Storm-dominated sand ridges, Sedimentary structures, Palaeotopography, Preservation, Sand sources, Coastal protection, Sustainability, |
| Online Access: | http://hdl.handle.net/10261/222379 http://dx.doi.org/10.13039/501100002809 http://dx.doi.org/10.13039/501100011033 |
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dig-icm-es-10261-2223792021-05-21T09:35:30Z Sediment characteristics and internal architecture of offshore sand ridges on a tideless continental shelf (western Mediterranean) Durán, Ruth Guillén, Jorge Ribó, Marta Simarro, Gonzalo Muñoz, Araceli Palanques, Albert Puig, Pere Generalitat de Catalunya Agencia Estatal de Investigación (España) Bedforms Storm-dominated sand ridges Sedimentary structures Palaeotopography Preservation Sand sources Coastal protection Sustainability 15 pages, 13 figures An integrated approach combining swath bathymetry, an extensive dataset of vibrocores and high‐resolution seismic reflection data was used to assess the origin and evolution of offshore sand ridges on a tideless continental shelf (Gulf of Valencia, western Mediterranean). The sand ridges are located in the mid‐outer shelf at 55–85 m water depth, obliquely oriented to the shoreline. They are 1.5 to 7 m high, with a wavelength between 600 and 1,100 m and a mean height‐to‐wavelength ratio of 0.004. The sand ridges are composed of well‐sorted medium sand and are partially covered by a mud layer, evidencing a moribund stage. They overlie an erosion surface that locally crops out at the seafloor and is interpreted as the Holocene wave‐ravinement surface. In the sediment cores, this surface corresponds to an erosional lag composed of coarse sand and gravel with pebbles. Small topographic irregularities on this surface are interpreted as shoreline‐associated features that may act as the precursor for ridge development. Their preservation within the sand ridges could be related to the hardness of these features. Internally, the sand ridges display high‐angle dipping reflections, indicating ridge migration towards the southeast in the direction of the present‐day sediment transport direction. The presence of interbedded mud layers, associated with these reflections, indicates intermittent episodes of mud deposition when active. The internal architecture of some small ridges also provides new insights into their transition from an active to moribund state, as evidenced by a change in the geometry of the internal units from progradational to aggradational, finally being overlain by onlapping finer deposits over the flanks and in the troughs. The Gulf of Valencia sand ridge field constitutes a valuable potential sand resource of 22 million m3 of well‐sorted medium and coarse sand with limited mud content, which must be preserved as a strategic sand reservoir. © 2020 John Wiley & Sons, Ltd This research was supported by the projects FORMED (CGL2012-33989) and COSTEM (CTM2009-07806). [...] R. Durán is supported by the Ocean and Littoral Sedimentary Process Consolidated http://mc.manuscriptcentral.com/esp Earth Surface Processes and Landforms For Peer Review Research Group by the Generalitat de Catalunya grant (2017 SGR-863) With the funding support of the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S), of the Spanish Research Agency (AEI) Peer reviewed 2020-11-06T06:57:06Z 2020-11-06T06:57:06Z 2020-11 artículo http://purl.org/coar/resource_type/c_6501 Earth Surface Processes and Landforms 45(14): 3592-3606 (2020) 0197-9337 CEX2019-000928-S http://hdl.handle.net/10261/222379 10.1002/esp.4986 1096-9837 http://dx.doi.org/10.13039/501100002809 http://dx.doi.org/10.13039/501100011033 en Preprint https://doi.org/10.1002/esp.4986 Sí open British Society for Geomorphology |
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Biblioteca del ICM España |
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English |
| topic |
Bedforms Storm-dominated sand ridges Sedimentary structures Palaeotopography Preservation Sand sources Coastal protection Sustainability Bedforms Storm-dominated sand ridges Sedimentary structures Palaeotopography Preservation Sand sources Coastal protection Sustainability |
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Bedforms Storm-dominated sand ridges Sedimentary structures Palaeotopography Preservation Sand sources Coastal protection Sustainability Bedforms Storm-dominated sand ridges Sedimentary structures Palaeotopography Preservation Sand sources Coastal protection Sustainability Durán, Ruth Guillén, Jorge Ribó, Marta Simarro, Gonzalo Muñoz, Araceli Palanques, Albert Puig, Pere Sediment characteristics and internal architecture of offshore sand ridges on a tideless continental shelf (western Mediterranean) |
| description |
15 pages, 13 figures |
| author2 |
Generalitat de Catalunya |
| author_facet |
Generalitat de Catalunya Durán, Ruth Guillén, Jorge Ribó, Marta Simarro, Gonzalo Muñoz, Araceli Palanques, Albert Puig, Pere |
| format |
artículo |
| topic_facet |
Bedforms Storm-dominated sand ridges Sedimentary structures Palaeotopography Preservation Sand sources Coastal protection Sustainability |
| author |
Durán, Ruth Guillén, Jorge Ribó, Marta Simarro, Gonzalo Muñoz, Araceli Palanques, Albert Puig, Pere |
| author_sort |
Durán, Ruth |
| title |
Sediment characteristics and internal architecture of offshore sand ridges on a tideless continental shelf (western Mediterranean) |
| title_short |
Sediment characteristics and internal architecture of offshore sand ridges on a tideless continental shelf (western Mediterranean) |
| title_full |
Sediment characteristics and internal architecture of offshore sand ridges on a tideless continental shelf (western Mediterranean) |
| title_fullStr |
Sediment characteristics and internal architecture of offshore sand ridges on a tideless continental shelf (western Mediterranean) |
| title_full_unstemmed |
Sediment characteristics and internal architecture of offshore sand ridges on a tideless continental shelf (western Mediterranean) |
| title_sort |
sediment characteristics and internal architecture of offshore sand ridges on a tideless continental shelf (western mediterranean) |
| publisher |
British Society for Geomorphology |
| publishDate |
2020-11 |
| url |
http://hdl.handle.net/10261/222379 http://dx.doi.org/10.13039/501100002809 http://dx.doi.org/10.13039/501100011033 |
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