Impact of bottom trawling on the morphology and sediment dynamics of La Fonera submarine canyon, northwestern Mediterranean

Impact of bottom trawling on the morphology and sediment dynamics of La Fonera submarine canyon, northwestern Mediterranean

24e Réunion des Sciences de la Terre (RST Pau 2014), 27 au 31 Octobre 2014, Pau.- 1 page

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Main Author: Puig, Pere
Format: comunicación de congreso biblioteca
Online Access:http://hdl.handle.net/10261/127538
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spelling dig-icm-es-10261-1275382019-03-06T13:55:35Z Impact of bottom trawling on the morphology and sediment dynamics of La Fonera submarine canyon, northwestern Mediterranean Puig, Pere 24e Réunion des Sciences de la Terre (RST Pau 2014), 27 au 31 Octobre 2014, Pau.- 1 page The physical disturbance of the deep-sea environment by the offshore displacement of commercial bottom trawling is a matter of concern. However, its effects on sediment resuspension and dispersal across continental margins and on the alteration of seafloor morphology still remain unaddressed. A focused study was conducted in La Fonera (Palamós) submarine canyon, where a bottom trawling fishing fleet operates on a daily basis, mainly at depths from 400 to 800 m. To assess the effects of trawling on the sedimentary dynamics, a moored line equipped with a downward-looking ADCP and several turbidimeters was deployed within a tributary valley on the canyon flank, slightly deeper than the maximum trawling depth. Time series revealed a nearly daily occurrence of sediment gravity flows linked to the passage of the trawling fleet. Increases of near-bottom suspended sediment concentrations and current velocities were observed repeatedly during weekdays at working hours, indicating a periodic sediment removal from fishing grounds. Such sediment dispersal propagates deeper, altering natural sediment accumulation rates along the main canyon axis. Additionally, a high-resolution multibeam bathymetry form the upper canyon was combined with the Vessel Monitoring Systems (VMS) positions obtained from local trawlers, evidencing a noticeable smoothing of bottom topography in the canyon flank regions affected by bottom trawling. Sediment coring and direct ROV inspections on both trawled and untrawled canyon flank sections also revealed a dramatic change of the original sediment properties and small-scale morphological complexity. These findings suggest that during the last decades following the industrialization of fishing fleets, bottom trawling has become an important driver altering the sedimentary dynamics and the deep seascape evolution, particularly in relatively steep continental slope environments, such as those found in large portions of the flanks of submarine canyons Peer Reviewed 2014-10-27 2016-01-13T10:22:23Z comunicación de congreso http://purl.org/coar/resource_type/c_5794 Résumés de la 24e Réunion des Sciences de la Terre. Abstracts: 88 (2014) http://hdl.handle.net/10261/127538 http://rst2014-pau.sciencesconf.org/resource/page/id/39 Sí none
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
description 24e Réunion des Sciences de la Terre (RST Pau 2014), 27 au 31 Octobre 2014, Pau.- 1 page
format comunicación de congreso
author Puig, Pere
spellingShingle Puig, Pere
Impact of bottom trawling on the morphology and sediment dynamics of La Fonera submarine canyon, northwestern Mediterranean
author_facet Puig, Pere
author_sort Puig, Pere
title Impact of bottom trawling on the morphology and sediment dynamics of La Fonera submarine canyon, northwestern Mediterranean
title_short Impact of bottom trawling on the morphology and sediment dynamics of La Fonera submarine canyon, northwestern Mediterranean
title_full Impact of bottom trawling on the morphology and sediment dynamics of La Fonera submarine canyon, northwestern Mediterranean
title_fullStr Impact of bottom trawling on the morphology and sediment dynamics of La Fonera submarine canyon, northwestern Mediterranean
title_full_unstemmed Impact of bottom trawling on the morphology and sediment dynamics of La Fonera submarine canyon, northwestern Mediterranean
title_sort impact of bottom trawling on the morphology and sediment dynamics of la fonera submarine canyon, northwestern mediterranean
url http://hdl.handle.net/10261/127538
work_keys_str_mv AT puigpere impactofbottomtrawlingonthemorphologyandsedimentdynamicsoflafonerasubmarinecanyonnorthwesternmediterranean
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