Merthyr Mawr Warren: Potential for Dune Reactivation
Twyni Merthyr Mawr: Y Potensial i Ailfywiogi Twyni

  • English
  • wel
  • All

This dataset is a compilation of work carried out to assess the geomorphological feasibility of sand dune reactivation at Merthyr Mawr Warren, based on a review of background environmental data, air photographs LiDAR data, a site visit and laboratory analysis of a limited number of sediment samples.


The Merthyr Mawr dunefield is a sediment-starved system which is undergoing re-distribution of sandy sediment from the north-western part to the south-eastern part of the system. Photographic evidence indicates that bare sand and active dunes covered a large part of the area between the late 19th century and the late 1960’s, after which time the dunes became progressively stabilized by vegetation. The period of high dune mobility corresponded with a period of coastal erosion. No long-term wind or wave data are available for the area, but it is hypothesized that coastal erosion, frontal dune blowout development and inland dune mobility were encouraged by high average wind and wave energy conditions, and perhaps a higher frequency of severe storms. Conversely, the period of inland dune stability between the 1970’s and the present day was associated with beach accretion and foredune progradation. It is hypothesized that these changes were driven by lower average wind / wave energy conditions and lower frequency of severe storms.


Bare sand and active parabolic dunes have only been maintained in areas where there is high visitor pressure or other anthropogenic disturbance. The purpose of this data capture was to help inform decisions that may result in potential re-mobilisation work, including impact on existing habitats and stakeholder interests.

Identification

Dynodydd
Identifier
NRW_DS114691
Laith Metadata
Metadata Language
English
Lineage

The methodology used included a processing numerous datasets such as LiDAR (Light Detection And Ranging) and Digital Elevation Model (DEM) background layers date from 2006-2008, base Ordnance Survey (OS) maps date from 1877, 1897, 1934 and 1966, Aerial photography dating from 2009, Admiralty charts dating from 2009 and Particle Size Analyses (PSA) data collected 7 September 2011. In addition 8 sediment samples were collected in the field from surf ace locations (0 to 10 cm depth). The samples were dry-sieved at 'quarter phi' intervals using a mechanical shaker and the raw data processed using the GRADISTAT software package.
Additional Information

The report and data collection/assessment builds on previous feasibility study carried out at Kenfig Burrows in 2001 (CCW Contract Science Report No. 971).
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2011-11-30
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Kenneth Pye Associates Ltd -
Kenneth Pye Associates Ltd, Crowthorne Enterprise Centre, Old Wokingham Road, Crowthorne, Berkshire, RG45 6AW, UK
http://www.kpal.co.uk/
 

Extent

Extent

Hyd
Geographic Extent
BRO MORGANNWG - THE VALE OF GLAMORGAN
Hyd
Geographic Extent
PEN-Y-BONT AR OGWR - BRIDGEND
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword

benthic boundary layer
 
 

Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Documents ( )

    Specification

    [A] The complete final report in Adobe PDF format and the text of the complete final report in Microsoft Word format [B] A series of GIS layers in their native format (Arc .shp) and equivalent MapInfo (.tab format) [C] A Word document detailing the data processing and structure of the GIS layers [D] xyz files for sections A to F, A1 to A6, B1 to B5 and C1 to C6 derived from the LiDAR DEM [E] A Microsoft Excel spreadsheet containing the particle size data [F] A full set of images produced in [jpg] format, identified by figure, appendix and photograph number

 

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

The methodology used included a processing numerous datasets such as LiDAR (Light Detection And Ranging) and Digital Elevation Model (DEM) background layers date from 2006-2008, base Ordnance Survey (OS) maps date from 1877, 1897, 1934 and 1966, Aerial photography dating from 2009, Admiralty charts dating from 2009 and Particle Size Analyses (PSA) data collected 7 September 2011. In addition 8 sediment samples were collected in the field from surf ace locations (0 to 10 cm depth). The samples were dry-sieved at 'quarter phi' intervals using a mechanical shaker and the raw data processed using the GRADISTAT software package.
 

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
  • sand dune management
  • Merthyr Mawr Warren
  • sand dunes (sand-dunes) (dunes) (see also specifically named dunes)
  • coastal geomorphology
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

Merthyr Mawr warren potential for dune reactivation
NRW Related Title

Kenfig sand dunes : potential for dune reactivation
 

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, 2011. 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. Those seeking commercial re-use for OS derived data require a commercial licence available from the OS.
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313134363931 XML
Laith Metadata
Metadata Language
English
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-03-03T13:06:42.896Z
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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