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dc.contributor.author
Martín de Nascimento, Jacobo  
dc.contributor.author
Puig, Pere  
dc.contributor.author
Palanques, Albert  
dc.contributor.author
Ribó, Marta  
dc.date.available
2016-08-01T20:46:15Z  
dc.date.issued
2014-06  
dc.identifier.citation
Martín de Nascimento, Jacobo; Puig, Pere; Palanques, Albert; Ribó, Marta; Trawling-induced daily sediment resuspension in the flank of a Mediterranean submarine canyon; Elsevier; Deep Sea Research Part II: Topical Studies in Oceanography; 104; 6-2014; 174-183  
dc.identifier.issn
0967-0645  
dc.identifier.uri
http://hdl.handle.net/11336/6853  
dc.description.abstract
Commercial bottom trawling is one of the anthropogenic activities causing the biggest impact on the seafloor due to its recurrence and global distribution. In particular, trawling has been proposed as a major driver of sediment dynamics at depths below the reach of storm waves, but the issue is at present poorly documented with direct observations. This paper analyses changes in water turbidity in a tributary valley of the La Fonera (=Palamós) submarine canyon, whose flanks are routinely exploited by a local trawling fleet down to depths of 800 m. A string of turbidimeters was deployed at 980 m water depth inside the tributary for two consecutive years, 2010–2011. The second year, an ADCP profiled the currents 80 m above the seafloor. The results illustrate that near-bottom water turbidity at the study site is heavily dominated, both in its magnitude and temporal patterns, by trawling-induced sediment resuspension at the fishing ground. Resuspended sediments are channelised along the tributary in the form of sediment gravity flows, being recorded only during working days and working hours of the trawling fleet. These sediment gravity flows generate turbid plumes that extend to at least 100 m above the bottom, reaching suspended sediment concentrations up to 236 mg l−1 close to the seafloor (5 m above bottom). A few hours after the end of daily trawling activities, water turbidity progressively decreases but resuspended particles remain in suspension for several hours, developing bottom and intermediate nepheloid layers that reach background levels ∼2 mg l−1 before trawling activities resume. The presence of these nepheloid layers was recorded in a CTD+turbidimeter transect conducted across the fishing ground a few hours after the end of a working day. These results highlight that deep bottom trawling can effectively replace natural processes as the main driving force of sediment resuspension on continental slope regions and generate increased near-bottom water turbidity that propagates from fishing grounds to wider and deeper areas via sediment gravity flows and nepheloid layer development.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Elsevier  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/  
dc.subject
Nepheloid Layers  
dc.subject
Bottom Trawling  
dc.subject
Sediment Resuspension  
dc.subject
Submarine Canyons  
dc.subject.classification
Geociencias multidisciplinaria  
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente  
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS  
dc.title
Trawling-induced daily sediment resuspension in the flank of a Mediterranean submarine canyon  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2016-08-01T18:17:25Z  
dc.journal.volume
104  
dc.journal.pagination
174-183  
dc.journal.pais
Países Bajos  
dc.journal.ciudad
Amsterdam  
dc.description.fil
Fil: Martín de Nascimento, Jacobo. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia y Tecnologia de Alimentos y Nutrición. Institut de Ciències del Mar; España. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina  
dc.description.fil
Fil: Puig, Pere. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia y Tecnologia de Alimentos y Nutrición. Institut de Ciències del Mar; España  
dc.description.fil
Fil: Palanques, Albert. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia y Tecnologia de Alimentos y Nutrición. Institut de Ciències del Mar; España  
dc.description.fil
Fil: Ribó, Marta. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia y Tecnologia de Alimentos y Nutrición. Institut de Ciències del Mar; España  
dc.journal.title
Deep Sea Research Part II: Topical Studies in Oceanography  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0967064513002270  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.dsr2.2013.05.036