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Geological and Physical

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  • SlibWad is a raster of 50*50m representing the silt value (the percentage of the particles < 63 µm) of the Dutch Wadden Sea. The values are an interpolation of real measurements.

  • The Seabed sediments map layer is based on original data on surficial seabed geology from the Dutch, French and UK national geological mapping agencies; data for Belgium were collected by Renard Centre for Marine Geology, University of Gent; data for Ireland were collected by Marine Institute. The full dataset on which the UK part of the map was based can be obtained from the British Geological Survey at www.bgs.ac.uk/products/digitalmaps/seabed.html. The data have been reclassifed into a modified version of the Folk classifcation that shows sediment classes appropriate to the EUNIS habitat classification scheme.

  • This dataset is a BGS interpretation (Sally Philpott) of 100% side scan cover from the survey area. The interpretation also referred to BGS historical sediment data for the area, and point ground-truth samples. This was a site specific survey around the Hastings shingle bank 12x4km in the Eastern Channel. The map was ground-truthed using video tows to assess the distinctness of the boundaries, thus giving a high confidence in the boundaries drawn. This is only sediment data, no biotope assignments have been made to these polygons. Faunal samples from Hammon Grabs and 2m beam trawls exist, but have not been used to interpret biotopes. This work is part of project AE1033 (internal CEFAS code) to be reported in CEFAS Science Series Technical Report, Summer 2005. The polygons follow the BGS sediment/bedform classification.

  • Broadscale interpretation of seabed facies between Hastings and Dungeness (Varne) in Eastern Channel. Survey was 50km (E) x 15km (N). Individual side scan tracks interpreted into seabed sediments, then interpolated across whole survey area by Sally Philpott (BGS Keyworth). This data set relates to side scan tracks at 1 km track spacing, 400 m swathe width. The data has limited ground-truthing, and biotopes have not been assigned. Faunal samples from Hammon Grabs and 2m beam trawls exist, but have not been used to interpret biotopes. PSA data in half phi units now converted to folk. The area contains the smaller, more detailed map of Hastings shingle bank, in Facies map of Hastings (GB000455). This work is part of project AE1033 (internal CEFAS code) to be reported in CEFAS Science Series Technical Report, Summer 2005. The polygons follow the BGS sediment/bedform classification.

  • Seabed facies interpretation (Sally Philpott, BGS) of area 12km x 4km east of the Isle of Wight, adjacent to Nab Tower, based on 100% side scan cover obtained in August 1998. The interpretation also referred to BGS historical sediment data for the area, and point ground-truth samples.

  • Sedi_m16 is a 50*50m raster of the Dutch Wadden Sea representing the median grain size (m16) of particles >16 µm. The values are an interpolation of real measurements.

  • Dataset covering the whole Belgian continental shelf; input to Marine Landscapes work; data has been verified

  • Temporal survey around dredged material disposal site 'TY070' (approx 8 x 4 km) off North Tyne, to assess utility of techniques for seabed mapping and monitoring. Pilot survey in 2001 using sidescan, AGDS, drop camera, grabs and trawls. 100% sidescan mosaics in 2002, 2003, 2004. Multibeam surveys in 2003, 2004. AGDS surveys in 2003, 2003. Outputs from each years acoustic surveys were used to delineate 'acoustically distinct areas' which were then ground-truthed using grabs, trawls & video (& sediment profile imagery in 2003). AGDS data (RoxAnn & QTC) subject to supervised & unsupervised classification for conparison across years [Supervised classification for QTC only, for 2001, 2002 & 2003. Supervision based on sediment type (Folk classification), faunal classes, and sediment/bedform types identified from sidescan mosaic]. Polygonised map submitted is for the 2004 survey, showing seabed character (substrate & bedform) interpreted from sidescan mosaics. Habitat/biotope classification not attempted.

  • Folk map using modified MESH Folk classes, Area Belgian continental shelf, Physical DEF

  • Slib2002 is a 50*50m raster representing the percentage of particles <16 µm in the Dutch Wadden Sea. The values are an interpolation of real measurements