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Metadata Report for BODC Series Reference Number 768615

Metadata Summary

Data Description

Data Category Bathymetry
Instrument Type Side scan sonar
Instrument Mounting self-propelled small boat
Originating Country United Kingdom
Originator Dr John Bacon
Originating Organization University of East Anglia School of Environmental Sciences
Processing Status QC in progress
Online delivery of data Download not available
Project(s) LEACOAST-2

Data Identifiers

Originator's Identifier BEDFORM_WAVELENGTH
BODC Series Reference 768615

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2006-06-16 00:00
End Time (yyyy-mm-dd hh:mm) 2006-06-16 00:00
Nominal Cycle Interval -

Spatial Co-ordinates

Southernmost Latitude 52.78280 N ( 52° 47.0' N )
Northernmost Latitude 52.80120 N ( 52° 48.1' N )
Westernmost Longitude 1.59400 E ( 1° 35.6' E )
Easternmost Longitude 1.63190 E ( 1° 37.9' E )
Positional Uncertainty 1.0 to 5.0 n.miles
Minimum Sensor or Sampling Depth -
Maximum Sensor or Sampling Depth -
Minimum Sensor or Sampling Height -
Maximum Sensor or Sampling Height -
Sea Floor Depth -
Sea Floor Depth Source -
Sensor or Sampling Distribution -
Sensor or Sampling Depth Datum -
Sea Floor Depth Datum -


BODC CODERankUnitsTitle
ACYCAA011DimensionlessSequence number
EASTOSG11MillimetresEasting relative to OSGB36 by Topcon 5Hz real-time kinematic GPS
LAMBDA011MetresWavelength of oscillations {bedforms} on the bed by in-situ imaging sonar and visual image interpretation
NRTHOSG11MillimetresNorthing relative to OSGB36 by Topcon 5Hz real-time kinematic GPS

Definition of Rank

  • Rank 1 is a one-dimensional parameter
  • Rank 2 is a two-dimensional parameter
  • Rank 0 is a one-dimensional parameter describing the second dimension of a two-dimensional parameter (e.g. bin depths for moored ADCP data)

Problem Reports

No Problem Report Found in the Database

Data Access Policy

Academic domain data

These data have no specific confidentiality restrictions for academic users. However, users must acknowledge data sources as it is not ethical to publish data without proper attribution. Any publication or other output resulting from usage of the data should include an acknowledgment.

The recommended acknowledgment is:

"This study uses data from data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."

Narrative Documents

LEACOAST-2 Bedform Morphology - BODC Processing

The data were received by BODC in an Excel spreadsheet. The files were transferred to BODC's internal QXF format using the Matlab transfer function 410. The originator's data were mapped to BODC parameter codes as detailed below:

Originator's ID Units Description BODC Parameter Code Units Comment
Lamda Metres Bedform Wavelength LAMBDA01 Metres -
Eastings Metres Eastings (Ordnance Survey OSGB36 grid) EASTOSG1 Millimetres Unit conversion (x1000)
Northings Metres Northings (Ordnance Survey OSGB36 grid) NRTHOSG1 Millimetres Unit conversion (x1000)

Following their transfer to QXF format, the data were screened for any potential problems.

LEACOAST-2 Bedform Morphology - Originator's Data Processing

Sampling Strategy

Bedform wavelength measurements were taken at 81 different points near the sea defences at Sea Palling by an undergradute student from UEA on 16/06/2006. A 2-D rotary side scan sonar, mounted on a benthic lander with an Aquadopp, was deployed from the fishing vessel "Fair Maiden". These data are included as part of the LEACOAST-2 project, which aims to evaluate the effects of shore-parallel breakwaters in tidal environments on coastal morphology.

Project Information

LEACOAST-2 Project

Project overview

During the floods of January 1953, Europe's worst natural disaster for over two centuries, the Norfolk coastline suffered a great deal of damage. The serious breach of the sea defences at Sea Palling warranted the largest scheme of offshore reefs in the UK to be built to protect the coast and the low-lying farm land behind it.

These shore-parallel reefs were constructed in two phases. An increased understanding of the performance of the reefs following the first phase of construction allowed the second phase to be designed to provide sufficient sea defence but control the levels of environmental impact.


The LEACOAST2 (Liverpool - East Anglia Coastal Study 2) project is a 3-year programme (2006-2009) funded by the Engineering and Physical Sciences Research Council. LEACOAST2 aims to:

  • Evaluate the effects of the breakwaters on the whole beach system over two years
  • Provide enhanced tools for improving the design guidelines for coastal defences

The research is focussed on:

  • Developing existing numerical models of the environmental processes at the breakwaters to include new factors such as waves breaking over the structures
  • Testing the sensitivities of several models of the local environment
  • Developing and testing an engineering model to predict long-term changes in beach shape
  • Extensive measurements of the waves, currents and beach shape to provide data for the models and to identify sediment transport pathways
  • Long-term monitoring of the change in coastline shape using advanced video and radar techniques
  • Improving the understanding of how the shore-parallel breakwaters at Sea Palling operate and interact with sediment sources and adjacent areas to provide better coastal management


Over months and years, the sea defences at Sea Palling interact with the adjacent beaches. To include these beaches within the LEACOAST2 programme the researchers use computer models, advanced field monitoring equipment and make measurements on the beach and just offshore at Sea Palling.

The field measurements include:

  • Rapid Global Positioning System (GPS) surveys
  • Acoustic current meters
  • 5-camera video system
  • X-band radar
  • Side-scan sonar imaging of bedforms

Data Activity or Cruise Information


Cruise Name 2006
Departure Date 2006-06-16
Arrival Date 2006-06-16
Principal Scientist(s)John Bacon (University of East Anglia School of Environmental Sciences)
Ship Fair Maiden

Complete Cruise Metadata Report is available here

Fixed Station Information

No Fixed Station Information held for the Series

BODC Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

Flag Description
Blank Unqualified
< Below detection limit
> In excess of quoted value
A Taxonomic flag for affinis (aff.)
B Beginning of CTD Down/Up Cast
C Taxonomic flag for confer (cf.)
D Thermometric depth
E End of CTD Down/Up Cast
G Non-taxonomic biological characteristic uncertainty
H Extrapolated value
I Taxonomic flag for single species (sp.)
K Improbable value - unknown quality control source
L Improbable value - originator's quality control
M Improbable value - BODC quality control
N Null value
O Improbable value - user quality control
P Trace/calm
Q Indeterminate
R Replacement value
S Estimated value
T Interpolated value
U Uncalibrated
W Control value
X Excessive difference

SeaDataNet Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

Flag Description
0 no quality control
1 good value
2 probably good value
3 probably bad value
4 bad value
5 changed value
6 value below detection
7 value in excess
8 interpolated value
9 missing value
A value phenomenon uncertain
B nominal value
Q value below limit of quantification