European Directory of Marine Environmental Data (EDMED)

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General
Data set name

Linear Sandbanks (Broad Fourteens) in the southern North Sea Data Set (1991)

Data holding centreProudman Oceanographic Laboratory
CountryUnited Kingdom  United Kingdom
Time periodFrom 04 to 19 December 1991
OngoingNo
Geographical area

Sandwave area 40km off Dutch coast - Broad Fourteens, Southern North Sea

Observations 
Parameters

Air pressure; Electrical conductivity of the water column; Wind strength and direction; Vertical velocity of the water column (currents); Bathymetry and Elevation; Sedimentation flux quantification in the water column; Salinity of the water column; Horizontal velocity of the water column (currents); Temperature of the water column; Concentration of suspended particulate material in the water column; Transport in the water column; Spectral wave data parameters; Turbulence in the water column

Instruments

Anemometers; wave recorders; current meters; current profilers; CTD; sidescan sonars; single-beam echosounders; radar altimeters; sediment traps; sediment grabs; sediment settling tubes

Description 
Summary

The Broad Fourteens study area, characterised by large tidal currents, moderate wave activity and regular, well developed sandwaves, is located approximately 40km off the Dutch coastline. Data were collected on RRS Challenger cruise 87, which had the following objectives: measurement of near- bed turbulence; vertical current structure; waves (especially directional spectra) and currents at two sites separated by 10km; determination of wave and current dissipation; measurement of suspended sediments; measurements of bedload transport; study of turbulent bursting events; observation of the response of bedforms to bottom stress and determination of drag partitioning over bedforms. The data collected in support of this include 10 moorings each deployed for 7 days at two sites separated by 10km and aligned with the average tidal flow directions. Moorings included STABLE, bottom mounted ADCP, current meters, waverider buoys. Fluorescent sand was released during a tracer experiment and grab samples of sand obtained subsequently. Wave data were also obtained using the secondary navigation on RRS Challenger. Meteorological data were also collected. CTD profiles were taken hourly over a 13 hour period. A side-scan sonar and echo-sounding survey was carried out.

OriginatorsProudman Oceanographic Laboratory
Availability 
OrganisationProudman Oceanographic Laboratory
AvailabilityBy negotiation
ContactThe Director
Address

Proudman Oceanographic Laboratory
Joseph Proudman Building 6 Brownlow Street
Liverpool
Merseyside
L3 5DA
United Kingdom

Telephone+44 151 795 4800
Administration 
Collating centreBritish Oceanographic Data Centre
Local identifier1054008
Global identifier745
Last revised2009-10-19