Metadata Report for BODC Series Reference Number 733130
Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags
Metadata Summary
Data Description |
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Data Identifiers |
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Time Co-ordinates(UT) |
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Spatial Co-ordinates | |||||||||||||||||||||||||||||
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Parameters |
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Problem Reports
No Problem Report Found in the Database
Data Access Policy
Public domain data
These data have no specific confidentiality restrictions for 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 the data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."
Narrative Documents
Sea Palling Nearshore Surveys - March to August 2007
BODC Processing
No survey took place in June 2007.
The data were received by BODC in ASCII format.
The data were then transferred to QXF using BODC transfer process 383. Following the transfer to QXF, the data were visualised within the in-house EDSERPLO package for quality control purposes.
BODC Parameter Code Mapping
| Raw Data Variable Name | Description | Units | Conversion Factor | BODC Parameter Code | Units |
|---|---|---|---|---|---|
| X | Ordnance Survey eastings | metres | *1000 | EASTOSG1 | millimetres |
| Y | Ordnance Survey northings | metres | *1000 | NRTHOSG1 | millimetres |
| Z_final | Depth below Ordnance Datum Newlyn | metres | *-1 | ODPTHZ02 | metres |
Data Quality
There are no reported or observed problems with these data.
Survey Instrumentation
The positioning system used is a Topcon 5Hz Real-Time Kinematic (RTK) which has been enabled to receive Global Positioning System (GPS) and Global Navigation Satellite System (GLONASS) signals. This system can receive up to 24 satellite signals at one time (known as channels), although in practice, only up to 12 channels are in use.
The RTK system allows a single reference station to provide real-time corrections to a GPS / GLONASS positional fix, allowing the accuracy of the surveys to be increased to the order of 1cm.
For the land-based survey portion the RTK positional data are logged by a Topcon FC controller at a point spacing of 1 - 3m.
For the nearshore surveys the RTK signal feeds a National Marine Electronics Association (NMEA0183) string to a Valeport MIDAS echosounder at 2Hz. The output of a MICROSTRAIN 3DGX1 motion sensor (pitch, roll and heading) are also recorded. The motion sensor outputs at 75Hz, but this is resampled to match the sampling rate of the positional data and the sounding log.
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.
Aims
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
Methods
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
| Cruise Name | Bathymetric survey 27/03/2007 |
| Departure Date | 2007-03-27 |
| Arrival Date | 2007-03-28 |
| Principal Scientist(s) | Tony Dolphin (University of East Anglia School of Environmental Sciences) |
| Ship | Unknown self-propelled small boat |
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 |
