European Directory of Marine Environmental Data (EDMED)

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Data set name

Sea Bottom Topography: Ancillary Water Column Observations, North Sea (April 1991)

Data holding centreUniversity of Wales, School of Ocean Sciences
CountryUnited Kingdom  United Kingdom
Time periodFrom 19 to 26 April 1991
Geographical area

North Sea off Netherlands coast, near to 52° 22.19'N, 4° 00.13'E


Transmittance and attenuance of the water column; Raw fluorometer output; Vertical velocity of the water column (currents); Salinity of the water column; Horizontal velocity of the water column (currents); Temperature of the water column; Acoustic backscatter in the water column


Fluorometers; current profilers; transmissometers; CTD; acoustic backscatter sensors; water body temperature sensor; salinity sensor


The data set was gathered onboard R.V. Prince Madog to provide background water quality information in support of remotely sensed observations made by helicopter and aircraft. As the aim was to investigate bottom topography influences, particular emphasis was placed on the measurement of current in the water column by the hull-mounted ADCP. The best data were considered to be those collected on 24 and 25 April, when the ship was allowed to drift over the sandwave bed features under the tidal current and when hydro-meteorological conditions were favourable. The data collected are stored as time series with generally 27.5s intervals for the ISIS data and various intervals for the ADCP data (but highest resolution for 60s sampling time). The upward looking sonar data may reflect slope tilts rather than backscatter from surface roughness as the sonar sledge was towed on bed. As far as is known, data should be reliable and internally consistent.

OriginatorsUniversity of Wales, School of Ocean Sciences

MAST (1992) 'Mapping of Sea Bottom Topography in a Multi-Sensor Approach', Final Report on MAST Contract 0040-C, CEC Report.

OrganisationUniversity of Wales, School of Ocean Sciences
ContactHead of Department

University of Wales, School of Ocean Sciences
School of Ocean Sciences, University of Wales Bangor, Menai Bridge, Anglesey,
Menai Bridge
LL59 5AB
United Kingdom

Telephone+44 1248 351151
Collating centreBritish Oceanographic Data Centre
Local identifier1021001
Global identifier553
Last revised2009-10-19