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Bibby HydroMap were commissioned in February 2019 by Vattenfall Wind Power Limited to undertake a geophysical survey of the Hollandse Kust Zuid I and II Offshore Wind Farms (HKZWFZ I and II). The HKZWFS I covers an area of 67.2 km2, although the effective area available for HKZWFS I is 56.5 km2 when the maintenance zones for infrastructure (active cables and one planned telecom cable) are included. HKZWFS II covers an area of 47.7 km2. There is no active existing or planned infrastructure crossing the site. The Luchterduinen Wind Farm, commissioned late 2015 and operated by Dutch energy company Eneco, is located within the HKZWFZ. The 129 MW wind farm consists of 43 Vestas 3 MW V112 turbines, each with a tip height of 137 m. The objective of the survey was to acquire high resolution survey data to enable the development and construction of Hollandse Kust (Zuid) Wind Farm Sites. The survey data consisted of high-resolution geophysical data (including UXO survey) within specified areas around each proposed WTG location. Additionally, high resolution geophysical data was also acquired along proposed Inter Array Cable (IAC) routes. The survey is part of an overall strategy to reduce the UXO risk to ALARP, and to obtain detailed seabed data for engineering purposes. The survey is designed to provide information needed primarily for the following: - UXO survey for site clearance prior to construction - High resolution data set for engineering purpose and seabed mobility assessment prior to installation of wind farm assets
Vattenfall Wind Power Ltd
Not suitable for public distribution
Other details | ||
Internal code | Internally assigned metadata identifier | 5844 |
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. | 2019_001_HKZ_I_II_Backscatter_Data |
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. | f9c2648f54d452d0b99debd3880ba069 |
Resource Identifier | This is the code assigned by the data owner. | 2019_001 |
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. | dataset |
Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 2019-02-20 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2019-10-25 |
Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | inapplicable |
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'. | notPlanned |
Abstract | The abstract provides a clear and brief statement of the content of the resource. | Bibby HydroMap were commissioned in February 2019 by Vattenfall Wind Power Limited to undertake a geophysical survey of the Hollandse Kust Zuid I and II Offshore Wind Farms (HKZWFZ I and II). The HKZWFS I covers an area of 67.2 km2, although the effective area available for HKZWFS I is 56.5 km2 when the maintenance zones for infrastructure (active cables and one planned telecom cable) are included. HKZWFS II covers an area of 47.7 km2. There is no active existing or planned infrastructure crossing the site. The Luchterduinen Wind Farm, commissioned late 2015 and operated by Dutch energy company Eneco, is located within the HKZWFZ. The 129 MW wind farm consists of 43 Vestas 3 MW V112 turbines, each with a tip height of 137 m. The objective of the survey was to acquire high resolution survey data to enable the development and construction of Hollandse Kust (Zuid) Wind Farm Sites. The survey data consisted of high-resolution geophysical data (including UXO survey) within specified areas around each proposed WTG location. Additionally, high resolution geophysical data was also acquired along proposed Inter Array Cable (IAC) routes. The survey is part of an overall strategy to reduce the UXO risk to ALARP, and to obtain detailed seabed data for engineering purposes. The survey is designed to provide information needed primarily for the following: - UXO survey for site clearance prior to construction - High resolution data set for engineering purpose and seabed mobility assessment prior to installation of wind farm assets |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | For all backscatter data processing and Angle vs. Range Analysis (ARA), Fledermaus Geocoder Toolbox (FMGT) was utilised. Preliminary data checks were conducted on board to assess data quality. The final processing and mosaic production were completed at the Bibby HydroMap office. The data for each survey area was loaded into FMGT with the databases and QPDs merged to a single GSF file in Qimera. This process utilised the QPD files created during the bathymetry processing and the raw QINSy database files containing backscatter data. Backscatter adjustments and filtering were undertaken by an automated process within the software, which applies specific parameters for Reson and Kongsberg backscatter data to create normalised data files ready for visualising in a single mosaic. With all data files normalised the resolution and size of the mosaic was defined. For this data the mosaic resolution was set to 1m. Due to the predefined survey blocks being too large for the computerâ??s memory to process mosaics at full resolution, mosaics were built based on survey line direction to ensure the highest quality of backscatter possible. Once these sections were created, they were adjusted to optimise the image and with a suitable range set were exported from FMGT. Blocks were loaded into FME where the whole site was normalised to ensure there was consistency across the survey area. Whilst processing the backscatter two issues arose. Banding was present across the site which caused some backscatter mosaics to have light and dark patches down single survey lines, this was due to an error in FMGT when processing the files and was easily fixed by manually changing the swath width in the software. The second issue was a lack of absorption value in some survey lines, this was found to be due to a bug in the Reson multibeam. This issue was fixed by overriding the absorption value with the correct value for the site, 110 dB. |
Related keywords | ||
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Oceanographic geographical features |
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 | Acoustic backscatter in the water column | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network | |
Geographical coverage | ||
North | The northern-most limit of the data resource in decimal degrees | 52.5505 |
East | The eastern-most limit of the data resource in decimal degrees | 4.394 |
South | The southern-most limit of the data resource in decimal degrees | 52.3932 |
West | The western-most limit of the data resource in decimal degrees | 4.0589 |
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 | Bibby HydroMap Ltd | |
Individual name | Molly Charlton | |
Position name | Graduate Geospatial Data Technician | |
Role | The distributor is the person or organisation that distributes the resource. | distributor |
Organisation name | Bibby HydroMap Ltd | |
Individual name | Matt Shenton | |
Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
Organisation name | Bibby HydroMap Ltd | |
Individual name | Rachael Langan | |
Position name | Senior Hydrographic Data Processor | |
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 | Vattenfall Wind Power Ltd | |
Individual name | Vattenfall United Kingdom Vattenfall United Kingdom | |
Position name | Vattenfall United Kingdom | |
Dataset constraints | ||
20 Limitations on Public Access - Access constraints | ISO restriction code chosen from ISO 19115-1 Codelist | otherRestrictions |
20 Limitations on Public Access – Other constraints | Any restriction on the use of the resource such as the need to agree to certain licence conditions. | Not suitable for public distribution |
21 Conditions for Access and Use - Use limitation | Any restrictions imposed on accessing the resource such as the need to agree to certain licence conditions. | Not suitable for use in navigation |
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. | 2020-03-31 |
Date of last revision | The most recent date that the resource was revised. | 2020-03-31 |
Date of creation | The date that the resource was created. | 2020-01-31 |
Metadata date | The date when the content of this metadata record was last updated. | 2020-03-31 |
Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN Discovery metadata standard |
Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 2.3.8 |
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