© OpenStreetMap contributors
- Add External Layer
- Upload Shapefile
- Layer Tutorial
- Close
Use the checkbox () to show or hide a layer.
Use the radio buttons () to select a layer to use with the identify function.
- Layers
- Opacity
Available layers
(ctrl+c)
Search for marine data across UK organisations
- API
- How-To
- About
- Contact MEDIN
- Share
Metadata: 2013, CT Offshore, Greater Gabbard, Multibeam Survey
Abstract:
Greater Gabbard Offshore Winds Ltd have recently completed the construction of a wind farm approximately 14mi east of Suffolk coast. The offshore wind farm consists of 152 Wind Turbine Generators (WTGs) with a gross nameplate capacity of approximately 504MW. The project is now fully operational and the construction was completed in September 2012. GGOWL signed up CT Offshore to conduct survey of the inter array cables. Water depths along the CTO scope of work vary between approx. 22 (LAT) at the point closest to the shore and 32m (LAT) furthest south west. Inspection of seabed bathymetry along the route of all 152 IA cable routes extending to 50m either side of each cable (i.e. 100m wide survey centred on cable). The cable route surveys should identify any exposed or free spanning sections of cable, any cable loops emergent from the seabed and the presence and location of any installed cable protection systems. Where possible, the IA cable surveys should cover the full span of the cable up to and including the cable monopile entry point and should illustrate exposed and free spanning cable in the vicinity of the monopiles. Where it is not possible to survey up to the monopole, the cable survey should extend as close to the structure as is deemed safe to do so. The survey must quantify the seabed position relative to lowest astronomical tide (LAT) thereby enabling any seabed movements relative to seabed position in 2009 to be quantified. The survey of the inter array cables shall include survey of the OSP’s (IGSUB and GASUB). Multibeam Survey is conducted to achieve the above results.
Data holder:
The Crown Estate
| Other details | ||
| Internal code | Internally assigned metadata identifier | 26195 |
| Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | 2013, CT Offshore, Greater Gabbard, Multibeam Survey |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Multibeam Survey |
| File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | 1448a758-fcf0-41de-a1d6-0d71272072eb |
| Resource Identifier | This is the code assigned by the data owner. | TCE-434 |
| Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | series |
| Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 2013-04-18 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2013-05-20 |
| Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | asNeeded |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | Greater Gabbard Offshore Winds Ltd have recently completed the construction of a wind farm approximately 14mi east of Suffolk coast. The offshore wind farm consists of 152 Wind Turbine Generators (WTGs) with a gross nameplate capacity of approximately 504MW. The project is now fully operational and the construction was completed in September 2012. GGOWL signed up CT Offshore to conduct survey of the inter array cables. Water depths along the CTO scope of work vary between approx. 22 (LAT) at the point closest to the shore and 32m (LAT) furthest south west. Inspection of seabed bathymetry along the route of all 152 IA cable routes extending to 50m either side of each cable (i.e. 100m wide survey centred on cable). The cable route surveys should identify any exposed or free spanning sections of cable, any cable loops emergent from the seabed and the presence and location of any installed cable protection systems. Where possible, the IA cable surveys should cover the full span of the cable up to and including the cable monopile entry point and should illustrate exposed and free spanning cable in the vicinity of the monopiles. Where it is not possible to survey up to the monopole, the cable survey should extend as close to the structure as is deemed safe to do so. The survey must quantify the seabed position relative to lowest astronomical tide (LAT) thereby enabling any seabed movements relative to seabed position in 2009 to be quantified. The survey of the inter array cables shall include survey of the OSP’s (IGSUB and GASUB). Multibeam Survey is conducted to achieve the above results. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The system used is a R2Sonic 2024 multibeam system with the following sensor configuration: Multibeam Echosounder: The 2024 multibeam system has 256 beams operating at a frequency of 60kHz Signal Bandwidth over the entire frequency range of 200kHz -400kHz, has a swath width at from 10° to 150°. The system’s depth capability is limited to 500m. The system’s range resolution is 1.25 cm. The transducer head can be installed on a vessel of opportunity as an-over-the-side mount on a rigged pole and plate assembly. The acoustic centre that is X, Y, Z of the subsurface unit is used as the reference position origin for the survey. Multibeam Bathymetry Collection System, EIVA Navi Scan: Essentially a computer with several serial ports, this is a dedicated data collection system that combines the data from the onboard sensors for the vessel’s heave, roll, pitch heading and position, time tagging them for post processing. The Navi Scan software records the raw data in its own binary format with the file extension *.SBD. For post processing, raw data files can be exported in a number of different formats depending on the type of multibeam software used for editing the data. Navigation system: This is required to provide real-time information to the vessel helmsman for navigating along the planned track lines of the survey. This is accomplished using EIVA Navi Pac software. A Navi Pac translation of the NMEA turns the output from the mobile GPS receiver into a graphical plot of the vessel’s movements. Heading Sensor: A heading sensor is required to measure the orientation of the vessel. The system used is a TSS Meridian Gyro compass. This provides heading data to .01 of a degree that is logged by the Navi Scan. The heading is the output from the Meridian Gyro to the motion sensor. On installation, the gyro sensor is aligned with the centre line of the survey vessel. Motion Sensor: This is essential to correct the swath data for vessel movement namely heave, pitch and roll. The unit used is a TSS DMS-05 motion reference unit. Once installed, the sensor requires that the offsets of its reference frame of origin is measured with respect to the survey origin, in this case, the acoustic centre of the multibeam system, and inserted in the Navi Scan program setup system offsets. Multibeam Bathymetry Data Editor: Once collected, multibeam data requires editing and cleaning before a presentation of data can be considered. This is accomplished with the “Navi Edit”, “Navi model” and the “Navi Plot” software from EIVA. Sound velocity Profile: The swath from multibeam echo is influenced by the speed of sound through water. The speed of sound depends on the salinity and the temperature in the water. The SVP is used to determine these variables. Fixed Sound Velocity Sensor – mounted on MBES head and used to measure and corrected in real-time for speed of sound Tidal reductions: All bathymetric data acquired during the survey are reduced to chart datum based on tidal corrections provided online by the RTG GPS height. |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Bathymetry and Elevation |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Post-Construction monitoring | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Renewable Energy Lease area | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Hydrography | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Geology | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 51.981616 |
| East | The eastern-most limit of the data resource in decimal degrees | 2.023934 |
| South | The southern-most limit of the data resource in decimal degrees | 51.730637 |
| West | The western-most limit of the data resource in decimal degrees | 1.831959 |
| Responsible organisations | ||
| Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
| Organisation name | SSE Renewables | |
| Phone | +44 (0)141 226 8916 | |
| info@sserenewables.com | ||
| Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
| Organisation name | The Crown Estate | |
| Phone | +44 020 7851 5000 | |
| enquiries@thecrownestate.co.uk | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | CT Offshore Limited | |
| Phone | +45 64 87 27 26 | |
| mail@ctoffshore.dk | ||
| Role | The distributor is the person or organisation that distributes the resource. | distributor |
| Organisation name | The Crown Estate | |
| Phone | +44 020 7851 5000 | |
| enquiries@thecrownestate.co.uk | ||
| Role | The owner is the person or organisation that owns the resource. | owner |
| Organisation name | SSE Renewables | |
| info@sserenewables.com | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk/details/TCE-434/summary |
| Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk | |
| Dataset constraints | ||
| 20.1 Limitations on Public Access - Access constraints | This states `otherRestrictions` from ISO vocabulary RestrictionCode and is an INSPIRE/GEMINI requirement. | otherRestrictions |
| 20.2 Limitations on Public Access - Other constraints | There will be no limitations when published on the Marine Data Exchange | |
| 21.1 Conditions for Access and Use - Use constraints | This states `otherRestrictions` from ISO vocabulary RestrictionCode and is an INSPIRE/GEMINI requirement. | otherRestrictions |
| 21.2 Conditions for Access and Use - Other constraints | This states any constraints on use of the data. Multiple conditions can be recorded for different parts of the data resource. If no conditions apply, then `No condtions apply` is recorded. This uses free text. | Data Must be used in accordance to the Marine Data Exchange's Terms of Use: https://www.marinedataexchange.co.uk/content/info/terms-of-use |
| Version info | ||
| Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 2021-05-17 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-14 |
| Metadata date | The date when the content of this metadata record was last updated. | 2026-04-07 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 3.1.2 |