Acoustic Monitoring of the Extent of the North Llyn Modiolus Reef

  • English
  • wel
  • All

Biogenic horse mussel (Modiolus Modiolus) reef is an important feature of the Pen Llyn a'r Sarnau Special Area of Conservation (SAC). The reef has high biodiversity and is vulnerable to anthropogenic activities, such as benthic fishing. The mussel reef forms an undulating surface that is significantly different to the surrounding seabed and therefore acoustic monitoring methods can be used to monitor changes in extent and identity areas of potential damage. Work is carried out on the north Llyn horse mussel reef in Pen Llyn a'r Sarnau jointly by Countryside Council for Wales (CCW) and University of Wales Bangor. The purpose of this data capture was to: - Measure extent and temporal changes within the of the Modiolus reef in the Pen Llyn a'r Sarnau SAC. - Investigate the health of the reef and for signs of anthropogenic activity within the area. An area approximately 10km by 6km, adjacent to the Pen Llyn coast, south-west of Porth Dinllaen, approximately 1.5km off shore was surveyed. All data is processed to reduce errors (e.g. positional corrections). Acoustic data is subject to ground-truthing using drop down videos captured as part of a separate project. As of April 1st, 2013 data is held and managed by Natural Resources Wales (NRW).

Identification

Dynodydd
Identifier
NRW_DS109891
Teitl Amgen
Alternative Title
  • 1999 CCW Modiolus monitoring trial survey off North Pen LLyn
  • Gwaith monitro acwstig ar y riff Modiolus yng Ngogledd Llyn
  • Side-scan sonar monitoring of the North Llyn Modiolus reef
Laith Metadata
Metadata Language
English
Lineage

Side scan-sonar data is captured from either the CCW research vessel (R.V. Pedryn) or the University research vessel (R.V. Price Madog) using a CMAX CM800 sidescan sonar. Multibeam has been captured from the University research vessel (R.V. Prince Madog) in 2008 using a Kongsberg EM 3002 Dual Head multibeam echo sounder. The reef and surrounding area was also multibeamed as part of the HABMAP project in 2005 on board the Irish Marine Institute's 'Celtic Voyager' using a simrad EM1002 95KHz multibeam Echosounder. Concurrently, a sub-bottom profiling system, using a broadband high-resolution 'boomer' was also used in the same area. All data is processed and incorporated into MapInfo GIS. Analysis of the data is written up as unpublished MSc projects at the University of Wales Bangor. Project is carried out in conjunction with the Across Wales drop-down video project. Additional projects have been carried out to study the anthropogenic effects discovered at the site.
Additional Information

Please see CCW Marine Monitoring Report no.50. 01/07/1998 side-scan sonar monitoring trial . Data is also available online at http://www.ukdmos.org/v_ukdmos_edios/result.asp

Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2013-04-01
Perchennog
Owner
  University of Wales Bangor
Bangor University, Bangor, Gwynedd, LL57 2DG
http://www.bangor.ac.uk
Perchennog
Owner
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Countryside Council for Wales (CCW)
Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW
http://naturalresourceswales.gov.uk/splash?orig=/
Cychwynnwr
Originator
  University of Wales, Bangor. School of Ocean Sciences
Bangor, Gwynedd, LL57 2DG
http://www.bangor.ac.uk
 

Extent

Extent

Hyd
Geographic Extent
Irish Sea
Hyd
Geographic Extent
Cardigan Bay
Hyd
Geographic Extent
Tremadog Bay
Hyd
Geographic Extent
GWYNEDD - GWYNEDD
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)
-25
Gwerth uchaf
Maximum value (metres)
-45
System Gyfeirio Cydlynu Fertigol
Vertical CRS
 
 

Distribution

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

    Specification

    [A] All raster images held as tif files. [B] Extent of the Modiolus reef held as MapInfo file.

 

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
Degree
false
Lineage

Side scan-sonar data is captured from either the CCW research vessel (R.V. Pedryn) or the University research vessel (R.V. Price Madog) using a CMAX CM800 sidescan sonar. Multibeam has been captured from the University research vessel (R.V. Prince Madog) in 2008 using a Kongsberg EM 3002 Dual Head multibeam echo sounder. The reef and surrounding area was also multibeamed as part of the HABMAP project in 2005 on board the Irish Marine Institute's 'Celtic Voyager' using a simrad EM1002 95KHz multibeam Echosounder. Concurrently, a sub-bottom profiling system, using a broadband high-resolution 'boomer' was also used in the same area. All data is processed and incorporated into MapInfo GIS. Analysis of the data is written up as unpublished MSc projects at the University of Wales Bangor. Project is carried out in conjunction with the Across Wales drop-down video project. Additional projects have been carried out to study the anthropogenic effects discovered at the site.
 

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
  • sidescan sonar
  • acoustic observation (acoustic monitoring)
  • modiolus modiolus
  • horse mussel
  • Special Area of Conservation Monitoring
  • biogenic reef
  • Pen Llyn a'r Sarnau cSAC
  • multibeam
Math
Type
Theme
Theme

Dyfyniad
Citation

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

Allweddair
Keywords

SeaDataNet Parameter Discovery Vocabulary
  • Side-scan sonar
  • Shellfish abundance and biomass in water bodies
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Adolygu)
Date (Revision)
2021-01-06
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

The establishment of a programme of surveillance and monitoring for judging the condition of the features of Pen Llyn a'r Sarnau cSAC : 1. Progress to March 2001
NRW Related Title

Review of sidescan sonar results from North Llyn
 

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

This data is jointly owned by NRW and the University of Wales, Bangor. 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 and Bangor University 2013 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 the copyright of NRW / Bangor University 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
4f4c4942-4343-5764-6473-313039383931 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
2024-12-09T12:37:25.699Z
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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