Title

Modelled seabed sediment average grain size in the European North-East Atlantic and Mediterranean waters

Date (Creation)

2024-04-15

Date (Publication)

2024-04-15

Abstract

Sediment average grain size in the European North-East Atlantic and Mediterranean waters was generated from Euseamap 2023 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	Jade Millot	Jade.Millot@ifremer.fr	Author
Ifremer	Sandrine Vaz	Sandrine.Vaz@ifremer.fr	Author
Ifremer	sextant	sextant@ifremer.fr	Publisher

Thèmes Sextant

• /Physical Environment/Sedimentology Geology

GEMET - INSPIRE themes, version 1.0

• Geology

DCSMM : Descripteurs

• D6: Sea-floor Integrity

Sous-regions marines

• /Metropolitan France

Thématiques - SIMM

• /Environmental Status/Geology

• /Environmental Status/Habitats

Use limitation

CC-BY (Creative Commons - Attribution)

Access constraints

Other restrictions

Use constraints

Copyright

Other legal constraints

We do our best to ensure that the data is complete, accurate and useful. However, because the processing required to generate the data is complex, we cannot be liable for omissions or inaccuracies. The data and any related materials contained therein are provided “as is”, without warranty of any kind, either expressed or implied, including but not limited to, fitness for a particular purpose, non-interference, system integration, or non-infringement. The entire risk of use of the data shall be with the user.

Spatial representation type

Vector

Language

English

Character set

UTF8

Topic category

• Oceans
• Environment

Reference system identifier

EPSG / WGS 84 (EPSG:4326) / 8.6

Geometric object type

Surface

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, EUNIS full detail classification
COPYFILE		Average_grain_size
WWW:LINK-1.0-http--publication-URL	https://doi.org/10.13155/97116	EUSeaMap 2023, A European broad-scale seabed habitat map, Technical Report
WWW:LINK	https://files.emodnet-seabedhabitats.eu/data/EUSeaMap_2023.zip	EUSeaMap_2023 original layer download

OnLine resource

Protocol	Linkage	Name
DOI	https://doi.org/10.12770/79050557-6f8a-48cc-9e60-4112cae9fd18	Digital Object Identifier (DOI)

Hierarchy level

Dataset

Description

Sediment average grain size was generated from sediment categories.

EUSeaMap sediment map of the European waters was used to obtain sediment distribution, grain size range (mm) per sediment group and % fraction of each main sediment group (Rock, coarse sediment, 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.

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 value was attributed to the corresponding polygons.

The categories - grain size correspondance are:

"fine mud" = 0.031525 mm, "sandy mud" = 0.09243549 mm, "Fine mud or sandy mud or muddy sand" = 0.17008322 mm, "Sandy mud or muddy sand" = 0.23936233056056 mm, "muddy sand" = 0.386289173 mm, "sand" = 0.94424275 mm, "mixed sediment" = 1.67029356 mm, "coarse & mixed sediment" = 6.34059641 mm, "coarse sediment" = 11.01089925 mm, "Rock or other hard substrata" = 2032 mm

Description

Polygones corresponding to undescribed sediment types, biogenic or seagrass habitats were removed from the layer as their average grain size were unknown.

Metadata

File identifier

79050557-6f8a-48cc-9e60-4112cae9fd18

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Date stamp

2024-08-27T15:04:37.283Z

Metadata standard name

ISO 19115:2003/19139 - SEXTANT

Metadata standard version

1.0

Metadata author

Organisation name	Individual name	Electronic mail address	Role
IFREMER	Vaz Sandrine	Sandrine.Vaz@ifremer.fr	Local service desk