Saltmarsh Features at Milford Haven 1996 - Sea Empress Survey
Nodweddion morfa heli Aberdaugleddau 1996 arolwg y Sea Empress

  • English
  • wel
  • All

The Sea Empress released approximately 72,000 tonnes of crude oil and about 480 tonnes of heavy fuel oil in the period 15 to 21 Feb 1996 when grounded off Milford Haven and later while at the jetty.


The coastline within Milford Haven was heavily oiled and a major clean-up operation was mounted. However, to avoid further damage, oil was not cleaned from the saltmarsh. Many of the affected saltmarshes in Milford Haven lie within Sites of Special Scientific Interest (SSSI) and also form components of candidate Special Area of Conservation (cSAC) under the Habitats Directive.


As part of the response to the oil spill, the former Countryside Council for Wales (CCW) now Natural Resources Wales (NRW) commissioned a damage assessment survey of impacted saltmarshes in Milford Haven. Carry out an assessment of the possible damage to saltmarsh habitat and the associated scarce species Salicornia pusilla and Limonium humile affected by the Sea Empress oil spillage and to establish a base-line against which future changes may be kept under surveillance - this included mapping the saltmarshes using National Vegetation Classification (NVC) methodology. The survey also aimed to assess the levels of hydrocarbon pollution within the sediments of the affected saltmarshes.

Identification

Dynodydd
Identifier
NRW_DS109884
Teitl Amgen
Alternative Title
  • Damage assessment survey of saltmarsh affected by the Sea Empress oil spill
  • NVC Phase 2 survey at Milford Haven 1996
Laith Metadata
Metadata Language
English
Lineage

Examination of NRW colour aerial photographs taken shortly before the spill (1992 to 1995) to assess extent of saltmarsh vegetation at that time to compare with the extent of vegetation mapped after the spill. Consideration of possible impacts of oil known to have been deposited along particular stretches of the shore. Observation on the distribution of oil during fieldwork for the current survey.


However, the fieldwork started eight months after the spill and so some redistribution of oil would have occurred. A phase II NVC style survey of saltmarsh vegetation and the scarce species to provide a baseline for monitoring future change. NRW commissioned survey which contributes to an NVC Saltmarsh survey collation (see 'part of' field). Data collected by trained personnel, digitised by contractors, validated by NRW, corrections made by contractors, validated again by NRW, corrections made in-house in conjunction with relevant salt marsh specialist.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
1999-12-31
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Centre For Ecology And Hydrology (NERC) -
Centre for Ecology and Hydrology (NERC), Deiniol Road, Bangor, Gwynedd, LL57 2UW, Bangor
http://www.ceh.ac.uk
 

Extent

Extent

Hyd
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

Dosbarthiad
Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Geographic Information System ( )

    Specification

    [A] GIS products- Vegetation polygons (MapInfo Table) Site Boundaries (MapInfo Table) Survey Boundary (MapInfo Table) Quadrat points (MapInfo Table) Vegetation NVC summaries (MapInfo Table)

  • Documents ( )

    Specification

    Paper report

 

Quality

Ansawdd Data
Data quality

Cwmpas Ansawdd
Quality Scope
Dataset
Dataset
Cydymffurfiad
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

This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
Degree
false
Lineage

Examination of NRW colour aerial photographs taken shortly before the spill (1992 to 1995) to assess extent of saltmarsh vegetation at that time to compare with the extent of vegetation mapped after the spill. Consideration of possible impacts of oil known to have been deposited along particular stretches of the shore. Observation on the distribution of oil during fieldwork for the current survey.


However, the fieldwork started eight months after the spill and so some redistribution of oil would have occurred. A phase II NVC style survey of saltmarsh vegetation and the scarce species to provide a baseline for monitoring future change. NRW commissioned survey which contributes to an NVC Saltmarsh survey collation (see 'part of' field). Data collected by trained personnel, digitised by contractors, validated by NRW, corrections made by contractors, validated again by NRW, corrections made in-house in conjunction with relevant salt marsh specialist.
 

Keywords

Allweddair
Keywords

GEMET - INSPIRE themes, version 1.0
Math
Type
Theme
Theme

Dyfyniad
Citation

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

Allweddair
Keywords

NRW Thesaurus
  • vegetation (see also specific types eg.coastal or heathland vegetation and vegetation surveys)
  • Pembrokeshire (county pre 1974)( county since 4/96)
  • Pembroke Dock
  • vegetation surveys (vegetation monitoring)(see also biologicalsurveys)
  • Sea Empress
  • vegetation classification
  • National Vegetation Classification (NVC)
  • saltmarsh (salt-marsh) (salt marsh)
  • Milford Haven
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2025-01-08
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Allweddair
Keywords

SeaDataNet Parameter Discovery Vocabulary
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2024-06-19
Code
geonetwork.thesaurus.external.theme.rdf+xml
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

NRW Related Title

Damage assessment survey of saltmarsh affected by the Sea Empress oil spillage
 

Constraints

Constraints

Limitations on Public Access and Use

Math o Gyfyngiad
Restriction type
Other restrictions
Other restrictions
 

Access Constraints Directive

Limitations
no limitations
 

Access Constraints Text

Other constraints

The following data is considered OS derived data and is therefore jointly owned by NRW and the Ordnance Survey. NRW may release, publish or disseminate this data freely; providing recipients are made aware of use restrictions (See general use restrictions).
 

Use Constraints

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© CNC/NRW and © Crown copyright [1999]. All rights reserved. Natural Resources Wales, AC0000849444 Third parties seeking to re-use this data require a Licence issued by NRW. It allows re-use, reproduction and dissemination in any format or medium but only for non-commercial purposes, according to the terms and conditions of the Licence. Those seeking commercial re-use require a commercial licence available from the OS.
 

Attribution Statement

Other constraints

Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Contains Ordnance Survey Data. Ordnance Survey Licence number AC0000849444. Crown Copyright and Database Right.
 

Licence

Other constraints
NRW Conditional
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313039383834 XML
Laith Metadata
Metadata Language
English
Parent Identifier
Phase 2 Saltmarsh Survey of Wales

NRW_DS108800
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-03-03T12:00:59.834Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

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

Publishing Body

Access the portal