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Titulua: Morphological characteristics of the Basque continental shelf (Bay of Biscay, northern Spain); their implications for Integrated Coastal Zone Management
Egilea: Galparsoro, Ibon; Borja, Angel; Legorburu, Irati; Hernandez, Carlos; Chust, Guillem; Liria, Pedro; Uriarte, Adolfo
Zitazioa: GEOMORPHOLOGY, 2010, 118, 314-329
Laburpena: This contribution integrates and analyzes data from high-resolution multibeam, seismic profiles, bathymetric LiDAR, and surficial sediment data for the geomorphological seascapes characterisation and process-description of the Basque inner and middle continental shelf (northern Spain). From the data obtained, the Basque shelf is characterised by a heterogeneous seafloor where, on a small spatial scale, different morphologies and sedimentary processes can be observed. Tectonic activity and sea-level changes, together with present processes of sediment supply and climatic conditions, have a critical influence on the present configuration of the continental shelf and the distribution of seafloor types. On the basis of all of the datasets, seafloor classification, bedform analysis, long-term sea-level change-induced seafloor features and anthropogenic features over the seafloor, are described. As a result, three distinct zones have been identified for the Basque shelf, related to the main geomorphological features and seascapes, as summarised below. (i) A western part, with a northwestern orientation, which coincides with the prevailing wave direction. This zone is characterised by a predominantly rocky substrate, except within the mouth of the Nervion estuary, where sandy sediments appear to infill a paleo-channel. (ii) A central part, which is oriented towards the northeast and receives less wave energy. Within this zone, a sedimentary seabed is predominant. Sorted bedforms are well developed and can be detected in water depths in excess of 90 m. (iii) An eastern zone, which is characterised by sedimentary seafloor and shore terraces; here, a flat rocky seafloor is covered by a thin layer of sediments. Throughout the study area, the bathymetry and sedimentary features of the shoreface and inner shelf are controlled mainly by climatic conditions, coastal dynamics and the underlying geological framework. The integration of these data sets, together with their interpretation, is a valuable source of information for Integrated Coastal Zone Management (ICZM) and constitutes a useful tool for implementing various European Directives. (C) 2010 Elsevier B.V. All rights reserved.
Gako-hitzak: Seafloor cartography; Geomorphology; Seascape; Multibeam echosounder; Bathymetric LiDAR; Integrated Coastal Zone Management; Basque shelf; SEA-FLOOR CHARACTERIZATION; RIPPLED SCOUR DEPRESSIONS; LONG-TERM DEVELOPMENT; GALICIA BANK; SEDIMENTARY PROCESSES; SORTED BEDFORMS; IBERIAN MARGIN; INNER-SHELF; METHODOLOGICAL APPROACH; MULTIBEAM BATHYMETRY
Gordailuaren-data: 2010
Argitalpen: ELSEVIER SCIENCE BV
Dokumentu mota: Article
Hizkuntza: Ingelesa
DOI: 10.1016/j.geomorph.2010.01.012
URI: http://dspace.azti.es/handle/24689/726
ISSN: 0169-555X
Babeslea: Department of Environment, Land Use, Agriculture and Fisheries, of the Basque Government
European Commision
Fundacion Centros Tecnologicos
Bildumetan azaltzen da:Artículos científicos



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