Llyn Cwm Mynach - United Kingdom

Basic Information
Site Name
Llyn Cwm Mynach
Short name
UWMN_16
Country
United Kingdom
Web Address
Llyn Cwm Mynach on UWMN
Llyn Cwm Mynach on UK Lakes Portal
Site Manager
Don Monteith
Site Description
UK Upland Waters Monitoring Network (UK UWMN) site. Llyn Cwm Mynach lies at 287 m altitude. The lake consists of two distinct basins; the southern section comprises a shallow limb separated from the deeper northern section by an old and broken stone causeway. The maximum depth of 11 m occurs in the northern basin in a localised hollow. Discrete drainage to the lake is by three small inflows and it is drained to the south-east by a small stream which flows to the Mawddach estuary. At some stage in the past a wooden weir (now derelict) was constructed at the outflow, presumably to raise the level of the southern section of the lake. Some data are managed by UK ECN Data Centre. Note: The area is the size of the catchment.
Last modified
2023-07-28 11:07:28

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General Characteristics and Status
Site Status
Operational
Year Established
1988
Observed properties
Affiliation and Network Specific Information
Affiliation
UK Upland Waters Monitoring Network✖ (UWMN_16)The affiliation of this site with "UK Upland Waters Monitoring Network" is not verified by the network on DEIMS-SDR.
Projects
Water Framework Directive (2000/60/EC)
Geographic
View in site map
Centroid/Representative Coordinates

Latitude: 52.7958 Longitude: -3.96083

Size
ca. 119.00ha
Elevation (average)
287.00msl
Elevation (min)
287.00msl
Elevation (max)
287.00msl
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Site information [.json]

Centroid/representative coordinates [.shp] [.kml]
GEO-BON Biome
Fresh water lakes
Biome
Fresh Water Lakes
Ecosystem Type
Lakes
Fresh Water Lakes
Small lakes
Biogeographical Region
Atlantic Bio-geographical Region
Precipitation Annual
2200.00mm
Geology
Cambrian siltstones to the north and grits and greywackes of the Cambrian Rhinog formation to the south.
Vegetation
Coniferous plantation (51%); acid moorland characterised by Calluna and Vaccinium (49%)
Soils
The north and east of the catchment is dominated by amorphous blanket peats, whereas acid ranker soils characterise the south and west.
Hydrology
The lake consists of two distinct basins; the southern section comprises a shallow limb separated from the deeper northern section by an old and broken stone causeway. The maximum depth of 11 m occurs in the northern basin in a localised hollow. Discrete drainage to the lake is by three small inflows and it is drained to the south-east by a small stream which flows to the Mawddach estuary. At some stage in the past a wooden weir (now derelict) was constructed at the outflow, presumably to raise the level of the southern section of the lake.
Protection Level (IUCN category)
Category V – Protected Landscape/Seascape/Area
Site Type
Stationary land-based site
Design of Experimentation
no experimentation
Scale of Experimentation
not applicable
Design of Observation
only observation
Scale of Observation
plot within catchment
Permanent Power Supply
No
Equipment notes
Accommodation in nearby villages.
Accessible All Year
Yes
All parts of Site Accessible
No
Permanent Operation
No
Operation Notes
Chemistry sampled monthly. Biological measurements made annually
Site Visit Interval
30
LTER Site Classification
Extensive
There is EURO-CORDEX climate scenario data available for this site:
Projected Near Surface Specific Humidity ChangeRCP26RCP45RCP85
Projected Precipitation ChangeRCP26RCP45RCP85
Projected Sea Level Pressure ChangeRCP26RCP45RCP85
Projected Surface Downwelling Shortwave RadiationRCP26RCP45RCP85
Projected Near-Surface Wind SpeedRCP26RCP45RCP85
Projected Near-Surface Air TemperatureRCP26RCP45RCP85
Projected Daily Maximum Near-Surface Air TemperatureRCP26RCP45RCP85
Projected Daily Minimum Near-Surface Air TemperatureRCP26RCP45RCP85

You can also download the entire climate scenario dataset for this site from the EUDAT B2SHARE data store.