Establishment of a Permanent Monitoring Site at Mid Channel Rocks, Milford Haven

Data from a study undertaken to establish a permanent monitoring site on Mid Channel Rocks, Milford Haven. The work was commissioned following the grounding of the Sea Empress oil tanker on the Mid Channel Rocks, Milford Haven on February 15th 1996. On the four days following the grounding, the tanker remained in the immediate vicinity of these rocks, grounding and floating free several times. An estimated 70,000 tonnes of oil were spilled within one nautical mile of the Mid-Channel Rocks. A considerable volume of dispersant was applied from the air in the nearby area. This is expected to have led to significantly elevated hydrocarbon levels in the water column, possibly including the more toxic oil fractions where fresh oil was dispersed. The objectives of this project were to establish a permanent sublittoral monitoring site at a rock substrate location close to the source of the spilled oil and which was amongst the most likely to have been subjected to elevated water column hydrocarbon load and to undertake a baseline survey to document epibenthic rock community and species composition, diversity, richness and condition. Data was captured in order to establish a permanent sublittoral monitoring site at a rock substrate location close to the source of the spilled oil and to undertake a baseline survey to document epibenthic rock community and species composition, diversity, richness and condition.

Identification

Identifier
NRW_DS110209
Alternative Title
  • Sefydlu Safle Monitro Parhaol yn y Mid Channel Rocks, Aberdaugleddau
Metadata Language
English
Lineage

Divers using standard SCUBA apparatus carried out the survey work. Procedures were carried out under HSE DOW 1981 regulations and JNCC diving rules (Holt, 1993). Once the study sites were marked out, a variety of data collecting exercises were carried out: Community descriptions were obtained from defined areas using Marine Nature Conservation Review (MNCR) techniques. Particular rock faces were chosen which were typical of the main habitat / community types and careful studies were undertaken to list all conspicuous species present and note abundances. Counts of species in quadrats and also suction samples were undertaken at both the Lower Infralittoral and Circalittoral Study Sites. This project followed immediately on from one which surveyed selected locations along the South Pembrokeshire coast from Milford Haven to Caldey. Mid Channel Rocks was one of the sites surveyed and the work was carried out with the present monitoring study in mind. The only data associated with this project is held within the report.
Dataset Reference Date (Publication)
1998-06-30
Owner
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Originator
  MarineSeen
Estuary Cottage, Bentlass, Hundleton, Pembrokeshire, SA71 5RN, Wales
http://www.marineseen.com/
Originator
  Subsea Survey
13-14 Merlins Cross, Lower Lamphey Road, Pembroke, Pembrokeshire, SA71 4AG
<!__ Nowebsite __!>
 

Extent

Extent

Geographic Extent
Wales (WLS)
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword

benthic boundary layer
 
 

Distribution

Format Type and Description
  • Documents ()

    Specification

    Report (MS Word and PDF-format) Postscript (MS Word)

 

Quality

Data quality

Quality Scope
Dataset
Conformity
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
Explanation
Degree
false
Lineage

Divers using standard SCUBA apparatus carried out the survey work. Procedures were carried out under HSE DOW 1981 regulations and JNCC diving rules (Holt, 1993). Once the study sites were marked out, a variety of data collecting exercises were carried out: Community descriptions were obtained from defined areas using Marine Nature Conservation Review (MNCR) techniques. Particular rock faces were chosen which were typical of the main habitat / community types and careful studies were undertaken to list all conspicuous species present and note abundances. Counts of species in quadrats and also suction samples were undertaken at both the Lower Infralittoral and Circalittoral Study Sites. This project followed immediately on from one which surveyed selected locations along the South Pembrokeshire coast from Milford Haven to Caldey. Mid Channel Rocks was one of the sites surveyed and the work was carried out with the present monitoring study in mind. The only data associated with this project is held within the report.
 

Keywords

Keywords

GEMET - INSPIRE themes, version 1.0
Type
Theme

Citation

Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus
  • Milford Haven
  • Sea Empress
  • oil
  • oil tankers
  • dispersant
  • oil dispersants
  • hydrocarbon analysis
  • hydrocarbons
  • marine biology (subtidal biology) (littoral biology) (sublittoral biology)(intertidal biology)(see also seashore)
  • marine surveys (intertidal & subtidal surveys) (littoral survey) (sublittoral surveys) (bathymetric survey) (see also marine monitoring and MNCR)
  • rock communities
  • baseline survey
  • marine and freshwater inventory
  • permanent monitoring site
  • Mid Channel Rocks
  • toxic oil fractions
  • sublittoral monitoring site
  • water column hydrocarbon load
  • epibenthic rock community
  • diversity
  • richness
  • condition
Type
Theme

Citation

Date (Publication)
2023-12-31
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Keywords

SeaDataNet Parameter Discovery Vocabulary
  • Pollution events
  • Zoobenthos generic abundance
  • Zoobenthos taxonomy-related counts
Type
Theme

Citation

Date (Revision)
2021-01-06
Code
geonetwork.thesaurus.external.theme.rdf+xml
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Content Information

NRW Profile

Custom Elements

NRW Related Title

The establishment of a permanent monitoring site at Mid Channel Rocks, Milford Haven
 

Constraints

Constraints

Limitations on Public Access and Use

Restriction type
Other restrictions
 

Access Constraints Directive

Limitations
no limitations
 

Access Constraints Text

Other constraints

There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
 

Use Constraints

Use constraints type
Other restrictions
Other constraints

© CNC/NRW There are no use restrictions on this data. Recipients may re-use, reproduce, disseminate this data free of charge in any format or medium, provided they do so accurately, acknowledging both the source and NRW's copyright, and do not use it in a misleading context. It is the recipient's responsibility to ensure the data is fit for the intended purpose, that dissemination or publishing does not result in duplication, and that it is fairly interpreted. Advice on interpretation should be sought where required. To avoid re-using old data, users should periodically obtain the latest version from the original source.
 
 
 

Metadata

Metadata

File Identifier
4f4c4942-4343-5764-6473-313130323039 XML
Metadata Language
English
Resource type
Dataset
Metadata Date
2024-05-31T09:38:35.489Z
Metadata Standard Name
NRW
Metadata Standard Version

1.0

pointOfContact
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 
 

Publishing Body

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