522f867b-f8b0-412c-8e4a-5a49980856f8 2025-05-15T22:23:49.836714Z ISO 19115-3 - SEXTANT 1.0 2 false WGS 84 (EPSG:4326) EPSG 8.6 Modelled seabed sediment average grain size in the Mediterranean 2020-04-01 creation 2020-04-01 publication https://sextant.ifremer.fr/record/522f867b-f8b0-412c-8e4a-5a49980856f8 Sediment average grain size in the Mediterranean was generated from sediment categories. This rough granulometry estimate may be used for habitat models at meso- and large scale. Ifremer Sandrine Vaz Ifremer Sandrine.Vaz@ifremer.fr author Margaux Llapasset AMOP author sextant Ifremer sextant@ifremer.fr publisher https://sextant.ifremer.fr/geonetwork/srv/api/records/522f867b-f8b0-412c-8e4a-5a49980856f8/attachments/Sediment_avg_grain_size_Med.jpg /Physical Environment/Geology/Seabed Nature Thèmes Sextant 2019-01-28 publication geonetwork.thesaurus.local.theme.sextant-theme Habitats and biotopes GEMET - INSPIRE themes, version 1.0 2018-07-27 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme D1: Deep-sea benthic habitats D6: Sea-floor Integrity DCSMM : Descripteurs 2020-04-09 publication geonetwork.thesaurus.local.theme.dcsmm-descripteur Western Mediterranean Sous-regions marines 2020-06-04 publication geonetwork.thesaurus.local.place.dcsmm.area /Environmental Status/Geology /Environmental Status/Habitats Research Thématiques - SIMM 2021-10-18 publication geonetwork.thesaurus.local.theme.simm.thematiques CC-BY-NC-SA (Creative Commons - Attribution, Pas d’utilisation commerciale, Partage dans les mêmes conditions) grid utf8 oceans environment -3.3025681795047 36.20932 27.0586820159975 49.3062604137295 https://hal-normandie-univ.archives-ouvertes.fr/hal-02084698/document WWW:LINK iso 16665 https://archimer.ifremer.fr/doc/00388/49975/ WWW:LINK EUSeaMap.A European broad-scale seabed habitat map https://www.emodnet-seabedhabitats.eu/about/euseamap-broad-scale-maps/ WWW:LINK EUSeaMap 2019, EUNIS full detail classification https://sextant.ifremer.fr/services/wms/galion OGC:WMS Sediment_avg_grain_size_Med COPYFILE Sediment_avg_grain_size_Med https://doi.org/10.12770/522f867b-f8b0-412c-8e4a-5a49980856f8 DOI Digital Object Identifier (DOI) RÈGLEMENT (UE) N o 1089/2010 DE LA COMMISSION du 23 novembre 2010 portant modalités d'application de la directive 2007/2/CE du Parlement européen et du Conseil en ce qui concerne l'interopérabilité des séries et des services de données géographiques 2010-12-08 publication See the referenced specification Sediment average grain size in French Mediterranean waters was generated from sediment categories. EUSeaMap sediment map of the Mediterranean was used to obtain sediment distribution, grain size range (mm) per sediment group and % fraction of each main sediment group (Rock, coarse and mixed sediment, mixed sediment, sand, muddy sand, sandy mud, fine mud or sandy mud, fine mud). Upper and lower boundaries for rock, pebble and clay size were derived from iso 16665 description. Fraction per category were derived from Folk (1954) sediment classification modified after EUSeaMap European broad-scale seabed habitat map description of categories (EUNIS L3 classes) for Mediterranean and Black Sea. Folk, R. L., 1954. The distinction between grain size and mineral composition in sedimentary rock nomenclature, Jour. Geology 62, 344–359. Römkens et al. (1997) equation enabling the estimation of average grain size from sediment typologie and fraction was applied: X = exp[ 0.01 * SUM( fi * ln( mi ) ) ] where X :average grain size (mm) ; mi : estimated average grain size of ith sediment category (mm) and ; fi : corresponding fraction of mi (%). Römkens, M. J. M., Young, R. A., Poesen, J. W. A., McCool, D. K., El-Swaify, S. A., & Bradford, J. M., 1997. Soil erodibility factor (K). Renard KG et al., Predicting soil erosion by water: a guide to conservation planning with the Revised Universal Soil Loss Equation (RUSLE). USDA Agriculture Handbook, (703), 65-99. Sediment categories were recoded with the computed average grain size and the layer was transformed in geotiff. The categories - grain size correspondance are: "fine mud" = 0.031525 mm, "mud" = 0.03781531 mm, "sandy mud" = 0.09243549 mm, "Fine mud or sandy mud or muddy sand" = 0.17008322 mm, "muddy sand" = 0.386289173 mm, "sand" = 0.94424275 mm, "mixed sediment" = 1.67029356 mm, "coarse & mixed sediment" = 6.34059641 mm, "Rock or other hard substrata" = 2032 mm