Saltmarsh Features at Milford Haven 1996 - Sea Empress Survey

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.

Identifier: NRW_DS109884

Alternative Title

Damage assessment survey of saltmarsh affected by the Sea Empress oil spill
Nodweddion morfa heli Aberdaugleddau 1996 arolwg y Sea Empress
NVC Phase 2 survey at Milford Haven 1996

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.

Dataset Reference Date (Publication): 1999-12-31

Temporal Extent

Begin date: 1996-10-31

End date: 1998-10-31

Topic category

Environment
Biota

Owner

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

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

Geographic Extent: Wales (WLS)

Vertical Extent

Medin Extent Keyword: benthic boundary layer

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) [B] Paper report

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: 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

GEMET - INSPIRE themes, version 1.0

Habitats and biotopes

Type: Theme

Citation

Date (Publication): 2008-06-01

Code: geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus

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

Type: Theme

Citation

Date (Publication): 2024-06-19

Code: geonetwork.thesaurus.local.theme.converted_nrw-keywords

Keywords

SeaDataNet Parameter Discovery Vocabulary

Habitat characterisation
Habitat extent

Type: Theme

Citation

Date (Publication): 2024-06-19

Code: geonetwork.thesaurus.external.theme.rdf+xml

Code: British National Grid (EPSG::27700)

Content Information

NRW Profile

Custom Elements

NRW Related Title: Damage assessment survey of saltmarsh affected by the Sea Empress oil spillage

Constraints

Limitations on Public Access and Use

Restriction type: 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

Use constraints type: 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.

Metadata

File Identifier: 4f4c4942-4343-5764-6473-313039383834 XML

Metadata Language: English

Parent Identifier: Phase 2 Saltmarsh Survey of Wales
NRW_DS108800

Resource type: Dataset

Metadata Date: 2024-09-30T14:51:33.219Z

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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Saltmarsh Features at Milford Haven 1996 - Sea Empress Survey

Identification

Temporal Extent

Extent

Extent

Vertical Extent

Distribution

Quality

Data quality

Keywords

Keywords

Citation

Keywords

Citation

Keywords

Citation

Spatial Reference System

Content

Content Information

NRW Profile

Custom Elements

Constraints

Constraints

Limitations on Public Access and Use

Access Constraints Directive

Access Constraints Text

Use Constraints

Metadata

Metadata

Publishing Body