Nutrient Modelling for Llangorse Lake

Llangorse Lake is the largest natural eutrophic lake in Wales and has been designated as a Site of Special Scientific Interest (SSSI) and a Special Area of Conservation (SAC). The lake has a history of eutrophication and so it was decided to undertake a nutrient modelling and nutrient budget exercise to determine the size and sources of nutrient loads entering the lake. Llangorse Lake has a history of eutrophication problems believed to have been caused by high nutrient loads entering the lake from the surrounding catchment. This study aimed to determine the size and main sources of those loads. Specific objectives include: - To review existing data and information on the water quality of Llangorse Lake. - To conduct a field study to investigate the nutrient budget of the lake. - To model the nutrient delivery from the catchment to the lake, with particular focus on phosphorus delivery, to give an indication of source apportionment. - To prepare a draft catchment management plan.

Identifier: NRW_DS110067

Alternative Title

Modelu maetholion ar gyfer Llyn Llan-gors

Metadata Language: English

Lineage: The nutrient load to the lake was estimated from nutrient concentrations and flows measured on the inflow streams. Nutrient concentrations were also measured in the outflow to provide an indication of lake water quality. The 8 monitoring sites were chosen to include the main drainage channels into and out of the lake and with sampling points located as close to the lake as practically possible. Water and flow sampling was conducted at fortnightly intervals for one year. Hydraulic load to the lake was calculated as were nutrient concentration in the lake inflows- specifically phosphorous and nitrate. Phosphorous concentrations in the sediments were collected and analysed.

Dataset Reference Date (Publication): 2008-12-31

Temporal Extent

Begin date: 2006-10-10

End date: 2007-09-25

Topic category

Environment

Owner

Natural Resources Wales (NRW)

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

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

Originator

Centre for Ecology and Hydrology (CEH)

Environment Centre Wales, Deiniol Road, Bangor, Gwynedd, LL57 2UW, Wales

http://www.ceh.ac.uk/

Extent

Geographic Extent: Wales (WLS)

Format Type and Description

Documents ()

Specification

Report in Word and PDF format Electronic versions of the figures contained in the report in *.tif format Data collected in excel spreadsheets

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 nutrient load to the lake was estimated from nutrient concentrations and flows measured on the inflow streams. Nutrient concentrations were also measured in the outflow to provide an indication of lake water quality. The 8 monitoring sites were chosen to include the main drainage channels into and out of the lake and with sampling points located as close to the lake as practically possible. Water and flow sampling was conducted at fortnightly intervals for one year. Hydraulic load to the lake was calculated as were nutrient concentration in the lake inflows- specifically phosphorous and nitrate. Phosphorous concentrations in the sediments were collected and analysed.

Keywords

GEMET - INSPIRE themes, version 1.0

Type: Theme

Citation

Date (Publication): 2008-06-01

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

Keywords

NRW Thesaurus

Llangorse Lake (llyn Safadden)
Lakes (Limnology)
SSSI (Sites of Special Scientific Interest)
Special Areas of Conservation (SAC) (see also Candidate Special Areas of Conservation cSAC)
eutrophication
nutrients
nitrates (nitrogen)
nutrient load
nutrient budget
Marine & Freshwater Science Group (MFSG)

Type: Theme

Citation

Date (Publication): 2023-12-31

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

Code: British National Grid (EPSG::27700)

Content Information

NRW Profile

Custom Elements

NRW Related Title: Nutrient modelling and a nutrient budget for Llangorse Lake

Constraints

Limitations on Public Access and Use

Restriction type: Other restrictions

Access Constraints Directive

Limitations: no limitations

Access Constraints Text

Other constraints: There are no access restrictions to this data. NRW may release, publish or disseminate it freely.

Use Constraints

Use constraints type: Other restrictions

Other constraints: © CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.

Metadata

File Identifier: 4f4c4942-4343-5764-6473-313130303637 XML

Metadata Language: English

Resource type: Dataset

Metadata Date: 2024-05-31T09:14:23.984Z

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

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Nutrient Modelling for Llangorse Lake

Identification

Temporal Extent

Extent

Extent

Distribution

Quality

Data quality

Keywords

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