Twyni Merthyr Mawr: Y Potensial i Ailfywiogi Twyni
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.
- Dull adnabod
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS114691
- Laith Metadata
- English
- Datganiad
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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.
- Gwybodaeth ychwanegol
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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)
- 2011-11-30
Ystod amser
- Dyddiad cychwyn
- 2011-11-07
- Dyddiad gorffen
- 2011-11-07
- Categori pwnc
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- Geoscientific information
Rhychwant
Rhychwant
- Hyd
- BRO MORGANNWG - THE VALE OF GLAMORGAN
- Hyd
- PEN-Y-BONT AR OGWR - BRIDGEND
))
Maint Fertigol
- Maint allweddair MEDIN
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benthic boundary layer
Dosbarthiad
- Fformat - Math a Disgrifiad
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-
Documents
(
)
- Math
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[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
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Documents
(
)
Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
- Dataset
- Datganiad
-
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.
Allweddeiriau
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
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NRW Thesaurus
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- coastal geomorphology
- sand dune management
- sand dunes (sand-dunes) (dunes) (see also specifically named dunes)
- Merthyr Mawr Warren
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2024-06-19
Allweddair
-
SeaDataNet Parameter Discovery Vocabulary
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- Coastal geomorphology
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2024-06-19
System Cyfeirio Gofodol
Cynnwys
Gwybodaeth Cynnwys
Proffil CNC
Elfennau CNC
- Teitlau cysylltiedig CNC
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Merthyr Mawr warren potential for dune reactivation
- Teitlau cysylltiedig CNC
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Kenfig sand dunes : potential for dune reactivation
Cyfyngiadau
Cyfyngiadau
Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus
- Math o Gyfyngiad
- Other restrictions
Cyfarwyddeb Cyfyngiadau Mynediad
- Cyfyngiadau
- no limitations
Testun cyfyngiadau mynediad
- Cyfyngiadau eraill
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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
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© 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
- 4f4c4942-4343-5764-6473-313134363931 XML
- Laith Metadata
- English
- Math o adnodd
- Dataset
- Dyddiad Metadata
- 2024-11-08T10:02:19.191Z
- Enw Safonol Metadata
- NRW
- Fersiwn Metadata
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1.0