Asesiad Cyflwr Traethellau Mwd a Thywod Rhynglanwol 2012
The Severn Estuary is the largest example of a coastal plain estuary in the United Kingdom. It has been designated as a Special Area of Conservation (SAC) under the EU Habitats Directive, a Special Protection Area (SPA) under the Birds Directive and as a Ramsar site under the Convention on Wetlands of International Importance.
The primary focus of this study relates to monitoring the intertidal mudflats and sandflats feature of the Severn Estuary SAC by assessing the relevant attributes for the purpose of condition assessment. However, monitoring of prey availability within the Severn Estuary SPA was also a secondary objective.
The survey was undertaken in three blocks between the 13th October and 14th November 2012.
- Dull adnabod
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS115547
- Teitl Amgen
-
- MRNE013700000005 - Severn Estuary SAC Sandflat and Mudflat Condition Assessment 2012
- Severn Estuary SAC Sandflat and Mudflat Condition Assessment 2012
- Laith Metadata
- English
- Datganiad
-
The methods employed within this study were largely limited to Phase II sampling that was based on Phase I biotope maps from previous studies. However, if any obviously incorrect biotope boundaries were encountered or if any notable habitats or species were observed during the course of the surveys, then records were appropriately amended. Anthropogenic influences and negative indicators were also recorded where encountered.
A total of 9 littoral mudflat and sandflat sediment biotopes were identified throughout the Severn Estuary SAC and SPA during the course of the study, and their subsequent extent and distribution was mapped using GIS. At each station;
- five replicate 0.01m2 cores were taken to a depth of 15 cm following ISI, Environment Agency and JNCC guidelines. A photograph of the sediment at the station and the general area was also taken. Macrofauna samples were delivered to APEM Ltd for analysis.
- the depth of the Redox Potential Discontinuity (RPD) layer was determined at each station and a second core taken for sediment granulometry. The sediment samples were delivered to the National Laboratory Service (NLS) at Starcross for PSA.
Previous Phase 1 biotope surveys were carried out on behalf of Natural England in 2005. Phase I surveys were also carried out on the Welsh shores between 1996 and 2005 on behalf of CCW. The specific methods used during these surveys are unknown as only the GIS map outputs are available.
- Gwybodaeth ychwanegol
-
Natural England, CCW and Environment Agency Wales (now NRW) jointly funded a joint sediment survey of the Severn estuary in 2012. The work was done as part of a framework agreement. CCW (now NRW) are free to supply Welsh related data.
- Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
- 2014-12-31
Rhychwant
Rhychwant
- Hyd
- Wales (WLS)
))
Maint Fertigol
- Maint allweddair MEDIN
-
benthic boundary layer
Dosbarthiad
- Fformat - Math a Disgrifiad
-
-
Documents
(
)
- Math
-
[A] Report in .doc and .PDF format. To be published as a CCW report [B] Marine Recorder data files (provided as part of NE snapshot) although they have also provided a copy of their full mdb file. MRNE013700000005 - Severn Estuary SAC Sandflat and Mudflat Condition Assessment 2012 [C] Photos site and substrata for each station in .jpg format [D] Macrofauna analysis, PSA and raw data in xls format [E] GIS data in native ArcGIS format (shp) and tranlsated by NRW to MapInfo format (TAB) - tracks and location sof sample locations, data and outfalls as well as habitat maps. GIS data used in the planning process are also supplied
-
Documents
(
)
Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
- Dataset
- Cydymffurfiad
- 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
- Eglurhad
-
This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Gradd
- false
- Datganiad
-
The methods employed within this study were largely limited to Phase II sampling that was based on Phase I biotope maps from previous studies. However, if any obviously incorrect biotope boundaries were encountered or if any notable habitats or species were observed during the course of the surveys, then records were appropriately amended. Anthropogenic influences and negative indicators were also recorded where encountered.
A total of 9 littoral mudflat and sandflat sediment biotopes were identified throughout the Severn Estuary SAC and SPA during the course of the study, and their subsequent extent and distribution was mapped using GIS. At each station;
- five replicate 0.01m2 cores were taken to a depth of 15 cm following ISI, Environment Agency and JNCC guidelines. A photograph of the sediment at the station and the general area was also taken. Macrofauna samples were delivered to APEM Ltd for analysis.
- the depth of the Redox Potential Discontinuity (RPD) layer was determined at each station and a second core taken for sediment granulometry. The sediment samples were delivered to the National Laboratory Service (NLS) at Starcross for PSA.
Previous Phase 1 biotope surveys were carried out on behalf of Natural England in 2005. Phase I surveys were also carried out on the Welsh shores between 1996 and 2005 on behalf of CCW. The specific methods used during these surveys are unknown as only the GIS map outputs are available.
Allweddeiriau
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
-
NRW Thesaurus
-
- aquatic fauna
- aquatic fauna
- sediment infauna
- subtidal sediments
- sediment epifauna
- biota
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2025-01-08
Allweddair
-
SeaDataNet Parameter Discovery Vocabulary
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2024-06-19
System Cyfeirio Gofodol
Cynnwys
Gwybodaeth Cynnwys
Proffil CNC
Elfennau CNC
Cyfyngiadau
Cyfyngiadau
Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus
- Math o Gyfyngiad
- Other restrictions
Cyfarwyddeb Cyfyngiadau Mynediad
- Cyfyngiadau
- no limitations
Testun cyfyngiadau mynediad
- Cyfyngiadau eraill
-
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).
Defnyddiwch gyfyngiadau
- Cyfyngiadau Defnyddio
- Other restrictions
- Cyfyngiadau eraill
-
© CNC/NRW and © Crown copyright 2012. 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
Metadata
- Dynodydd Ffeil
- 4f4c4942-4343-5764-6473-313135353437 XML
- Laith Metadata
- English
- Math o adnodd
- Dataset
- Dyddiad Metadata
- 2026-03-03T14:43:47.887Z
- Enw Safonol Metadata
- NRW
- Fersiwn Metadata
-
1.0