Countryside Council for Wales (CCW) Acoustic Habitat Survey (multibeam) of Habitat and Feature Distribution in Pembrokeshire Marine Candidate Special Area of Conservation (cSAC)
Arolwg Acwstig ar Gynefin ACA Sir Benfro Forol

  • English
  • wel
  • All

Pembrokeshire Marine candidate Special Area of Conservation (cSAC) is a large area including open coast and the Milford Haven Waterway that has been identified as being of European marine conservation importance. Features of this site include marine species and seabed habitats. The purpose of the Acoustic Habitat Survey was to provide information on the nature and characteristics of the seabed within defined areas of the Pembrokeshire coastline. The dataset contains the results of a project to gather topographical and seabed characterisation information to improve the knowledge of the site and to aid in future site management and feature monitoring. Primary focus- areas of topographical distinction such as reefs, other hard substrata and sandbanks. Areas covered in the Pembrokeshire cSAC survey include; Skomer, Grassholm, Hats & Barrels, Welshmans Bay, East side of Skokholm, St Ann's Head, Milford Approaches and the majority of the Milford Haven estuary upstream as far as Picton Point.

Identification

Dynodydd
Identifier
NRW_DS110024
Teitl Amgen
Alternative Title
  • Longdin and Browning Acoustic Habitat Survey of Pembrokeshire Marine SAC
  • Arolwg acwstig o ddosbarthiad cynefinoedd a nodweddion yn yACA Morol Sir Benfro
  • Multi beam survey Pembs SAC.
Laith Metadata
Metadata Language
English
Lineage

Once mobilisation and all calibrations had been conducted, survey work could proceed. The same basic method of survey was used throughout the whole survey area. Throughout the project the vessel was moored in Milford Dock. When leaving the dock, or while alongside the Mackerel pontoon outside the dock entrance, a course check was made on the navigation systems. All transit time was put to full use by conducting survey to and from site. Once all systems were found to be operating correctly a sound velocity profile was observed. The results of the profile were entered into both the multibeam system and the single beam sounder. Once the vessel arrived at the proposed working location for the day another S/V profile was observed. The results were entered into the relevant equipment. Sidescan sonar was required in the Marine Nature Reserve (MNR), now classified as Marine Conservation Zone (MCZ). This was observed at the same time as the Multibeam data. As a large proportion of this area was relatively shallow the sidescan was towed behind the vessel on a fairly short tow cable. The offset of the fish behind the Central Reference Point (CRP) of the vessel was applied in the Sidescan data capture system (Octopus 460).
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2002-02-28

Temporal Extent

Begin date
2001-08-24
End date
2001-09-14
 
Categori pwnc
Topic category
  • Environment
    Environment
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Longdin and Browning (Surveys) Limited -
Cherry Tree House, Carmarthen Road, Swansea, SA1 1HE
http://www.longdin.co.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

Maint Fertigol
Vertical Extent

Gwerth lleiaf
Minimum value (metres)
1.5
Gwerth uchaf
Maximum value (metres)
60
System Gyfeirio Cydlynu Fertigol
Vertical CRS
 
 

Distribution

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

    Specification

    Report (MS Word), Map Info TAB Files, BITMAP image files.

 

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

Once mobilisation and all calibrations had been conducted, survey work could proceed. The same basic method of survey was used throughout the whole survey area. Throughout the project the vessel was moored in Milford Dock. When leaving the dock, or while alongside the Mackerel pontoon outside the dock entrance, a course check was made on the navigation systems. All transit time was put to full use by conducting survey to and from site. Once all systems were found to be operating correctly a sound velocity profile was observed. The results of the profile were entered into both the multibeam system and the single beam sounder. Once the vessel arrived at the proposed working location for the day another S/V profile was observed. The results were entered into the relevant equipment. Sidescan sonar was required in the Marine Nature Reserve (MNR), now classified as Marine Conservation Zone (MCZ). This was observed at the same time as the Multibeam data. As a large proportion of this area was relatively shallow the sidescan was towed behind the vessel on a fairly short tow cable. The offset of the fish behind the Central Reference Point (CRP) of the vessel was applied in the Sidescan data capture system (Octopus 460).
 

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
  • marine and freshwater inventory
  • Special Areas of Conservation (SAC) (see also Candidate Special Areas of Conservation cSAC)
  • feature
  • habitats (see also specific types of habitats)
  • habitat distribution
  • Pembrokeshire (county pre 1974)( county since 4/96)
  • acoustic observation (acoustic monitoring)
  • Pembrokeshire Marine cSAC
  • multibeam
  • bathymetry
  • feature distribution
  • Bathymetric survey
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2026-08-27
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
Latitude and Longitude (EPSG::4326)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

NRW Related Title

Habitat and feature distribution in Pembrokeshire marine cSAC : acoustic habitat survey
 

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

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

Use Constraints

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© CNC/NRW 2002 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

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313130303234 XML
Laith Metadata
Metadata Language
English
Parent Identifier
Multibeam Acoustic Data Index

NRW_DS121633
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-09-28T11:47:53.463Z
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

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