Merthyr Mawr Warren: Potential for Dune Reactivation

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.

Identifier: NRW_DS114691

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).

Dataset Reference Date (Publication): 2011-11-30

Temporal Extent

Begin date: 2011-11-07

End date: 2011-11-07

Topic category

Geoscientific information

Owner

Natural Resources Wales (NRW)

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

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

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

Geographic Extent: BRO MORGANNWG - THE VALE OF GLAMORGAN

Geographic Extent: PEN-Y-BONT AR OGWR - BRIDGEND

Map representing the geographic extent of the dataset

Vertical Extent

Medin Extent Keyword: benthic boundary layer

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

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: 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

GEMET - INSPIRE themes, version 1.0

Land cover

Type: Theme

Citation

Date (Publication): 2008-06-01

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

Keywords

NRW Thesaurus

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

Type: Theme

Citation

Date (Publication): 2024-06-19

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

Keywords

SeaDataNet Parameter Discovery Vocabulary

Coastal geomorphology

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: Merthyr Mawr warren potential for dune reactivation

NRW Related Title: Kenfig sand dunes : potential for dune reactivation

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, 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

File Identifier: 4f4c4942-4343-5764-6473-313134363931 XML

Metadata Language: English

Resource type: Dataset

Metadata Date: 2024-11-08T10:02:19.191Z

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

Access the portal

Full access to the portal and metadata.

Merthyr Mawr Warren: Potential for Dune Reactivation

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