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Airborne geophysics: a novel approach to assist hydrogeological investigations at groundwater-dependent wetlands

David Beamish and Gareth Farr
Quarterly Journal of Engineering Geology and Hydrogeology, 46, 53-62, 12 February 2013, https://doi.org/10.1144/qjegh2012-019
David Beamish
1British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
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  • For correspondence: dbe@bgs.ac.uk
Gareth Farr
2Environment Agency Wales, Ty Cambria, 29 Newport Road, Cardiff CF24 0TP, UK
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Abstract

This paper provides an assessment of existing airborne baseline geophysical data in relation to the hydrogeological characterization of protected groundwater-dependent terrestrial ecosystems (wetlands) in Anglesey, Wales. The attenuation of the radiometric data identifies the main areas of water saturation in the very near surface. The radiometric data have the potential to identify additional areas where similar degrees of saturation exist. The data may therefore be used to help define extensions to existing site boundaries and to provide information in the assessment of new wetland areas. The radiometric data also show regional-scale transition from the Carboniferous Limestone in the east, important for water supply to the wetlands, to older more impermeable strata to the west. The conductivity data appear capable of mapping the lateral extent of clay accumulations, concealed below peat cover which can act as a confining layer to the bedrock aquifer. At the regional scale the data reveal the extent of a former Holocene lake system and the hydrogeological control of a Carboniferous limestone–sandstone contact. The data therefore provide a non-invasive spatially continuous, characterization of the sites, improving the understanding of their dynamic water balances and, potentially, guiding further ground assessments and invasive investigations.

  • © 2013 The Geological Society of London
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Quarterly Journal of Engineering Geology and Hydrogeology: 46 (1)
Quarterly Journal of Engineering Geology and Hydrogeology
Volume 46, Issue 1
February 2013
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Airborne geophysics: a novel approach to assist hydrogeological investigations at groundwater-dependent wetlands

David Beamish and Gareth Farr
Quarterly Journal of Engineering Geology and Hydrogeology, 46, 53-62, 12 February 2013, https://doi.org/10.1144/qjegh2012-019
David Beamish
1British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
  • Find this author on Google Scholar
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  • Search for this author on this site
  • For correspondence: dbe@bgs.ac.uk
Gareth Farr
2Environment Agency Wales, Ty Cambria, 29 Newport Road, Cardiff CF24 0TP, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Airborne geophysics: a novel approach to assist hydrogeological investigations at groundwater-dependent wetlands

David Beamish and Gareth Farr
Quarterly Journal of Engineering Geology and Hydrogeology, 46, 53-62, 12 February 2013, https://doi.org/10.1144/qjegh2012-019
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