Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/13102
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Silva, A.J.F. | pt |
dc.contributor.author | Azevedo, M.R. | pt |
dc.contributor.author | Martins, R. | pt |
dc.contributor.author | Mamede, R. | pt |
dc.contributor.author | Ricardo, F. | pt |
dc.contributor.author | Magalhães, L. | pt |
dc.contributor.author | Monteiro, P. | pt |
dc.contributor.author | Bentes, L. | pt |
dc.contributor.author | Gonçalves, J.M.S. | pt |
dc.contributor.author | Quintino, V. | pt |
dc.contributor.author | Rodrigues A.M. | pt |
dc.contributor.author | Freitas, R. | pt |
dc.date.accessioned | 2015-01-07T12:13:31Z | - |
dc.date.available | 2015-01-07T12:13:31Z | - |
dc.date.issued | 2012 | - |
dc.identifier.uri | http://hdl.handle.net/10773/13102 | - |
dc.description.abstract | This work presents a simplified map of the spatial distribution of surficial sediments and rock outcrops along the Portuguese continental shelf in ArcGIS format. Preliminary map preparation involved scanning, georeferencing and digitizing of pre-existing base maps from the Portuguese Hydrographic Institute and harmonization with other published and non-published cartographic information. Samples of soft bottom shelf sediments from nearly 500 sites, collected in the scope of the MeshAtlantic, RENSUB and ACOSHELF projects, were analyzed for grain-size and total organic matter. Grain-size analysis was performed using dry and wet sieving. The procedure includes chemical destruction of organic matter with H2O2, chemical dispersion with tetra-sodium pyrophosphate, separation of the mud fraction by wet sieving and dry sieving of both sand and gravel fractions. Raw grain-size data were expressed as weight percentages and classified according to a modified version of the Folk classification system. Grain size data for the whole set of samples were used to create a new sediment distribution map and develop an easy-to-use GIS interface, that will be available in the MeshAtlantic website, as part of a global broadscale habitat map for the Atlantic Area. Overall, the bottom sediment distribution patterns show that: (a) the coarser deposits occur mainly in the inner and mid-shelf of the northwestern sector of the Portuguese shelf, to the south of the Nazaré and Setúbal canyons, and are sparsely represented in the southern shelf; (b) sand banks dominate in the near shore shelf, but can sporadically be found at greater depths; (c) muddy sands characterize the deeper shelf; (d) patches of sandy mud and mud reflecting a less energetic hydrodynamic regime cover a large sector of the southern shelf and areas located off the mouths of major rivers in the western shelf; (e) mixed sediments are residual; (f) rock outcrops are unevenly distributed throughout the entire shelf. | pt |
dc.language.iso | eng | pt |
dc.publisher | FCUL | pt |
dc.relation | MeshAtlantic - Atlantic Area Program 2009-1/110 | pt |
dc.relation | FCT - GEOBIOTEC PEst-OE/CTE/UI4035/2011 | pt |
dc.relation | FCT - CESAM PEst-C/MAR/LA0017/2011 | pt |
dc.rights | openAccess | por |
dc.subject | Marine sediments | pt |
dc.subject | Folk classification | pt |
dc.subject | ArcGIS software | pt |
dc.title | A Bottom Sediment Distribution Map for the Portuguese Continental Shelf in ArcGis Format: Mapa da Distribuição de Sedimentos Superficiais da Plataforma Continental Portuguesa em Formato ArcGis | pt |
dc.type | conferenceObject | pt |
dc.peerreviewed | yes | pt |
ua.publicationstatus | published | pt |
ua.event.date | 16-20 Dezembro, 2012 | pt |
ua.event.type | congress | pt |
degois.publication.firstPage | 64 | pt |
degois.publication.lastPage | 64 | pt |
degois.publication.location | Lisboa | pt |
degois.publication.title | MIA 2012: VII Simpósio da Margem Ibérica Atlântica | pt |
dc.relation.publisherversion | http://www.fc.ul.pt/pt/conferencia/mia-2012 | pt |
Appears in Collections: | DGeo - Comunicações |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Silva_7 º SIMPÓSIO_MIA_RESUMOS_FINAL.pdf | documento principal | 287.85 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.