Baseline Scotland: groundwater chemistry data: Difference between revisions

From MediaWiki
Jump to navigation Jump to search
Ajhil (talk | contribs)
Created page with "{{Underconstruction}} ==Baseline Scotland: groundwater chemistry data== ===Regional summary=== In central and southern Scotland, 31 sites have been sampled for methane from a number of different sedimentary aquifers, mostly from the Carboniferous Clackmannan and Coal Measures groups in central Scotland. Here, groundwater was historically an important resource for industry, but today is not widely used. In southern Scotland there is local groundwater abstraction for agric..."
 
Ajhil (talk | contribs)
No edit summary
Line 1: Line 1:
{{Underconstruction}}
{{Underconstruction}}
==Baseline Scotland: groundwater chemistry data==
==Baseline Scotland: groundwater chemistry data==
===Regional summary===
Collecting new data on groundwater chemistry in Scotland to provide a scientific foundation to Scottish, UK and European water quality policy.
In central and southern Scotland, 31 sites have been sampled for methane from a number of different sedimentary aquifers, mostly from the Carboniferous Clackmannan and Coal Measures groups in central Scotland. Here, groundwater was historically an important resource for industry, but today is not widely used. In southern Scotland there is local groundwater abstraction for agriculture and domestic use.


[[Image:CentralSouthScotlandGeology_v2.jpg|frameless|center|700px|]]
===About Baseline Scotland===
SEPA logo
Baseline Scotland is a joint project between BGS and SEPA which is providing new groundwater chemistry data for Scotland. This new data provides essential information to sustainably manage Scotland’s water environment, as required by Scottish, UK and European water legislation, (such as the Water Framework Directive). Before Baseline Scotland very little reliable groundwater chemistry data existed, particularly for trace elements.


<center>'''Geology of central and southern Scotland'''</center>
Systematic groundwater sampling surveys were carried out across all the major bedrock aquifers in Scotland between 2005 and 2011, as well as many superficial aquifers. Standardised sampling techniques were used to characterise the groundwater chemistry in detail and investigate how long since groundwater was recharged from rainfall; how groundwater has interacted with the aquifer rocks; and whether there is any groundwater pollution. The results from most parts of Scotland have already been reported in detailed reports. Summary results for each major aquifer group in Scotland are presented in Scotland’s Aquifers and Groundwater Bodies (2015). Detailed results for the final areas, and a detailed overview of the baseline groundwater chemistry of Scotland, will be reported soon.


The Clackmannan Group and Coal Measures Group form multi-layered and vertically segmented aquifers, in which fine-grained, well-cemented sandstone layers act as discrete aquifer units in which groundwater flow is predominantly through fractures, and which are separated by lower permeability siltstones, mudstones or coals. Groundwater may be present at various depths under unconfined or confined conditions, and different groundwater heads are seen in different aquifer layers. The thickness of the Carboniferous sedimentary aquifers varies from less than 500 m in southern Scotland to 3000 m in central Scotland.
The aims of Baseline Scotland are:
To characterise the natural background groundwater quality in the main aquifers of Scotland, by carrying out new detailed groundwater chemistry sampling.
To provide a scientific foundation to Scottish, UK and European water quality policy and groundwater management and protection, with an emphasis on the protection and sustainable development of high quality groundwater
Outputs
Summarised groundwater chemistry data for major bedrock aquifers in Scotland.
Spatial coverage of groundwater chemistry data: Scotland
Spatial coverage of Baseline Scotland groundwater chemistry data: for bedrock aquifers (blue circles) and Quaternary aquifers (green squares).
Spatial coverage of Baseline Scotland groundwater chemistry data: for bedrock aquifers (blue circles) and Quaternary aquifers (green squares). Backdrop is 1:625 000 scale geological map.


In this area the formation which is most likely to have potential for shale gas and/or oil is the West Lothian Oil-Shale Formation, which lies stratigraphically immediately below the Clackmannan Group in the eastern part of central Scotland.
Before the Baseline Scotland project began there was little information on natural groundwater chemistry in Scotland. Existing data was mainly old, of variable quality, limited (often to a few major ions only), and skewed to areas of groundwater contamination, particularly related to mining, and to the more productive Scottish aquifers, in particular the Devonian aquifers of Fife, Strathmore and Morayshire, and the Permian aquifer in Dumfries. Since the start of the Baseline Scotland project, 268 new groundwater samples have been collected from aquifers across Scotland. A further 479 samples collected during other projects since 2001, using equally rigorous sampling techniques to the Baseline samples, have been incorporated into the Baseline dataset.


===Methane in UK groundwater results===
These summary results are from single sampling visits to each site as part of the [[Baseline Scotland: groundwater chemistry data | Baseline Scotland project]]. The data are summarised for the central and southern Scotland regions as a whole, and also for individual aquifers, where enough data are available.


[[Image:CentralSouthScotlandTopography_RB_v2.jpg|frameless|center|500px|]]
Baseline sampling
The Baseline sampling surveys collected new data on groundwater chemistry, stable isotopes and residence times. Rigorous well head measurements (of parameters including dissolved oxygen, redox potential, SEC and bicarbonate) were combined with collecting samples for analysis of major, minor and trace ions; stable isotopes (δH2, δ18O and δ13C); dissolved organic carbon; and where possible, CFC (chlorofluorocarbon), SF6 (sulphur hexafluoride), and other dissolved gases such as CH4 (methane).


[[Image:CentralSouthScotlandBarChart.jpg|frameless|center|500px|]]
Technical details of the Baseline sampling methodology
Measuring wellhead chemistry.
Measuring wellhead chemistry
Sampling groundwater.
Sampling groundwaterSampling groundwater.
Sampling groundwater
Baseline Scotland data
Major bedrock aquifer units in Scotland, which show distinctly different baseline groundwater chemistry


{|class="wikitable" style="background-color:#F0F8FF; margin:auto;"
Major bedrock aquifer units in Scotland, which show distinctly different baseline groundwater chemistry
| '''Area'''
| colspan="3" | '''Concentration (mg/l)'''
|| '''Number of samples'''
|-
|
| Minimum
| Median
| Maximum
|
|-
|Central and southern Scotland
|<0.0001
|0.0036
|1.68
|31
|-
|Clackmannan and Coal Measures Groups
|<0.0005
|0.00835
|1.68
|18
|}


<small><center>Methane samples and concentrations in central and southern Scotland<br>
Twelve major bedrock aquifer units have been defined across Scotland, which have distinctly different controls on baseline groundwater chemistry – largely related to geological age and rock type. The baseline groundwater chemistry of each of these aquifer units is reported separately. Click on the data links below to view summaries of baseline groundwater chemistry data already reported for Scotland.
Note: values less than the analytical detection limit have been converted to half the detection limit for<br>the purposes of this statistical summary and graph, but the relevant detection limit is quoted in the table above.</small></center>


===Baseline groundwater quality data===
Baseline Scotland data summaries
A summary of the baseline quality of groundwater in this area is below. This data was collected as part of a collaborative project between BGS and the [https://www.sepa.org.uk/ Scottish Environment Protection Agency] to investigate the [https://www2.bgs.ac.uk/groundwater/quality/baselineScotland/home.html/ baseline quality of groundwater in major Scottish aquifers].
Aberdeenshire data
 
Midland Valley data
Groundwater from the Clackmannan and Coal Measures Groups in this area is typically reducing and contains a high proportion of old water, recharged more than 35–60 years ago. Mining activity in this area has had a major impact on groundwater quality. More detail on groundwater quality for [https://www2.bgs.ac.uk/groundwater/quality/baselineScotland/MidlandValleyData.html/ central Scotland] and [https://www2.bgs.ac.uk/groundwater/quality/baselineScotland/southernScotlandData.html/ southern Scotland] is available via the [https://www2.bgs.ac.uk/groundwater/quality/baselineScotland/home.html/ Baseline Scotland] web pages.
Moray Firth data
 
Southern Scotland data
{|class="wikitable" style="background-color:#F0F8FF; margin:auto;"
Strathmore data
| '''Analysis'''
Manganese in Scottish Groundwater
| colspan="3" | '''Concentration (mg/l)'''
A summary of the baseline groundwater chemistry in each major bedrock aquifer in Scotland is presented in Scotland’s Aquifers and Groundwater Bodies.
| '''Number of samples'''
|-
|
| Minimum
| Median
| Maximum
|
|-
|Ca
|7.26
|54.5
|290
|21
|-
|Mg
|3.11
|17.5
|96.2
|21
|-
|Na
|6.2
|15.5
|461
|21
|-
|K
|0.64
|3.08
|26.8
|21
|-
|Cl
|5.14
|20.7
|1230
|21
|-
|SO<sub>4</sub>
|3.82
|48.5
|244
|21
|-
|HCO<sub>3</sub>
|7
|265
|734
|21
|}
 
<center>'''Baseline groundwater quality data for central and southern Scotland'''</center>


Contact
Contact Brighid Ó Dochartaigh for further information.
===Contact===
===Contact===
Please contact [https://www.bgs.ac.uk/about-bgs/contact-us/ BGS Enquiries] for more information.
Please contact [https://www.bgs.ac.uk/about-bgs/contact-us/ BGS Enquiries] for more information.
[[category:Groundwater and shale gas]]
[[category:Groundwater and shale gas]]

Revision as of 10:52, 5 June 2026

Baseline Scotland: groundwater chemistry data

Collecting new data on groundwater chemistry in Scotland to provide a scientific foundation to Scottish, UK and European water quality policy.

About Baseline Scotland

SEPA logo Baseline Scotland is a joint project between BGS and SEPA which is providing new groundwater chemistry data for Scotland. This new data provides essential information to sustainably manage Scotland’s water environment, as required by Scottish, UK and European water legislation, (such as the Water Framework Directive). Before Baseline Scotland very little reliable groundwater chemistry data existed, particularly for trace elements.

Systematic groundwater sampling surveys were carried out across all the major bedrock aquifers in Scotland between 2005 and 2011, as well as many superficial aquifers. Standardised sampling techniques were used to characterise the groundwater chemistry in detail and investigate how long since groundwater was recharged from rainfall; how groundwater has interacted with the aquifer rocks; and whether there is any groundwater pollution. The results from most parts of Scotland have already been reported in detailed reports. Summary results for each major aquifer group in Scotland are presented in Scotland’s Aquifers and Groundwater Bodies (2015). Detailed results for the final areas, and a detailed overview of the baseline groundwater chemistry of Scotland, will be reported soon.

The aims of Baseline Scotland are: To characterise the natural background groundwater quality in the main aquifers of Scotland, by carrying out new detailed groundwater chemistry sampling. To provide a scientific foundation to Scottish, UK and European water quality policy and groundwater management and protection, with an emphasis on the protection and sustainable development of high quality groundwater Outputs Summarised groundwater chemistry data for major bedrock aquifers in Scotland. Spatial coverage of groundwater chemistry data: Scotland Spatial coverage of Baseline Scotland groundwater chemistry data: for bedrock aquifers (blue circles) and Quaternary aquifers (green squares). Spatial coverage of Baseline Scotland groundwater chemistry data: for bedrock aquifers (blue circles) and Quaternary aquifers (green squares). Backdrop is 1:625 000 scale geological map.

Before the Baseline Scotland project began there was little information on natural groundwater chemistry in Scotland. Existing data was mainly old, of variable quality, limited (often to a few major ions only), and skewed to areas of groundwater contamination, particularly related to mining, and to the more productive Scottish aquifers, in particular the Devonian aquifers of Fife, Strathmore and Morayshire, and the Permian aquifer in Dumfries. Since the start of the Baseline Scotland project, 268 new groundwater samples have been collected from aquifers across Scotland. A further 479 samples collected during other projects since 2001, using equally rigorous sampling techniques to the Baseline samples, have been incorporated into the Baseline dataset.


Baseline sampling The Baseline sampling surveys collected new data on groundwater chemistry, stable isotopes and residence times. Rigorous well head measurements (of parameters including dissolved oxygen, redox potential, SEC and bicarbonate) were combined with collecting samples for analysis of major, minor and trace ions; stable isotopes (δH2, δ18O and δ13C); dissolved organic carbon; and where possible, CFC (chlorofluorocarbon), SF6 (sulphur hexafluoride), and other dissolved gases such as CH4 (methane).

Technical details of the Baseline sampling methodology Measuring wellhead chemistry. Measuring wellhead chemistry Sampling groundwater. Sampling groundwaterSampling groundwater. Sampling groundwater Baseline Scotland data Major bedrock aquifer units in Scotland, which show distinctly different baseline groundwater chemistry

Major bedrock aquifer units in Scotland, which show distinctly different baseline groundwater chemistry

Twelve major bedrock aquifer units have been defined across Scotland, which have distinctly different controls on baseline groundwater chemistry – largely related to geological age and rock type. The baseline groundwater chemistry of each of these aquifer units is reported separately. Click on the data links below to view summaries of baseline groundwater chemistry data already reported for Scotland.

Baseline Scotland data summaries Aberdeenshire data Midland Valley data Moray Firth data Southern Scotland data Strathmore data Manganese in Scottish Groundwater A summary of the baseline groundwater chemistry in each major bedrock aquifer in Scotland is presented in Scotland’s Aquifers and Groundwater Bodies.

Contact Contact Brighid Ó Dochartaigh for further information.

Contact

Please contact BGS Enquiries for more information.