Title

Modelled seabed sediment average grain size in the Mediterranean

Date (Creation)

2020-04-01

Date (Publication)

2020-04-01

Abstract

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.

Credit

Ifremer

Point of contact

Organisation name	Individual name	Electronic mail address	Role
Ifremer	Sandrine Vaz	Sandrine.Vaz@ifremer.fr	Author
AMOP	Margaux Llapasset		Author
Ifremer	sextant	sextant@ifremer.fr	Publisher

Thèmes Sextant

• /Physical Environment/Geology/Seabed Nature

GEMET - INSPIRE themes, version 1.0

• Habitats and biotopes

DCSMM : Descripteurs

• D1: Deep-sea benthic habitats

• D6: Sea-floor Integrity

Sous-regions marines

• Western Mediterranean

Thématiques - SIMM

• /Environmental Status/Geology

• /Environmental Status/Habitats

• Research

Use limitation

CC-BY-NC-SA (Creative Commons - Attribution, Pas d’utilisation commerciale, Partage dans les mêmes conditions)

Access constraints

Other restrictions

Use constraints

Copyright

Spatial representation type

Grid

Language

English

Character set

UTF8

Topic category

• Oceans
• Environment

Reference system identifier

EPSG / WGS 84 (EPSG:4326) / 8.6

Number of dimensions

2

Dimension name

Vertical

Dimension name

Time

Cell geometry

Area

Transformation parameter availability

Distribution format

Name	Version

OnLine resource

Protocol	Linkage	Name
WWW:LINK	https://hal-normandie-univ.archives-ouvertes.fr/hal-02084698/document	iso 16665
WWW:LINK	https://archimer.ifremer.fr/doc/00388/49975/	EUSeaMap.A European broad-scale seabed habitat map
WWW:LINK	https://www.emodnet-seabedhabitats.eu/about/euseamap-broad-scale-maps/	EUSeaMap 2019, EUNIS full detail classification
OGC:WMS	https://sextant.ifremer.fr/services/wms/galion	Sediment_avg_grain_size_Med
COPYFILE		Sediment_avg_grain_size_Med

OnLine resource

Protocol	Linkage	Name
DOI	https://doi.org/10.12770/522f867b-f8b0-412c-8e4a-5a49980856f8	Digital Object Identifier (DOI)

Hierarchy level

Dataset

Description

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.

Description

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.

Description

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

Metadata

File identifier

522f867b-f8b0-412c-8e4a-5a49980856f8

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Date stamp

2024-05-21T08:49:56.073Z

Metadata standard name

ISO 19115:2003/19139 - SEXTANT

Metadata standard version

1.0