Show simple item record

dc.contributor.advisorDaly, Eve
dc.contributor.authorO'Connell, Yvonne
dc.date.accessioned2017-05-19T14:29:13Z
dc.date.issued2017-05-19
dc.identifier.urihttp://hdl.handle.net/10379/6528
dc.description.abstractAirborne, terrestrial and marine geophysics have been employed to examine coastal zone hydrogeology in two very different aquifer types in Ireland. Modelling of regional airborne electromagnetic data informed by ground-based ERT allowed the determination of the aquifer electrical resistivity/conductivity distribution within a locally important coastal sand and gravel aquifer on the east coast. The effective electrical conductivity as a function of porosity for the groundwater body was estimated with salinity and clay mass fraction constraints from supplementary drilling. The hydraulic conductivity depth function was estimated after calibration with a hydraulic conductivity measurement in the field allowing a determination of lateral variations in groundwater hydraulic conductivity across the sand and gravel aquifer, showing potential for upscaling to catchment scale water resource management. On the west coast of Ireland, groundwater movement in two catchments of a regionally important coastal karst aquifer was examined with terrestrial and marine geophysics. This hydrogeophysical examination confirmed the extension of faulting offshore and groundwater egress/saltwater ingress along fault. The examination of subterranean conduit and epikarstic flow paths and intertidal and submarine groundwater discharge provided new evidence for previously predicted terrestrial and submarine pathways confirming the existence of active SGD. Discrete conduit network modelling, informed by the terrestrial geophysics coupled with ancillary hydrogeological observations characterised the hydrogeology of one of the catchments by determining flow pathways and their likely hydraulic mechanisms indicating a complex conduit network of constrictions and bypass channels with multiple inlets and outlets. This work augments our understanding of groundwater movement in the coastal zone for the management of coastal aquifer systems and provides transferrable practices to assist in catchment-scale assessments of coastal aquifers.en_IE
dc.subjectHydrogeophysicsen_IE
dc.subjectAquifer porosityen_IE
dc.subjectElectrical conductivityen_IE
dc.subjectHydraulic conductivityen_IE
dc.subjectSubmarine groundwater dischargeen_IE
dc.titleHydrogeophysics of coastal aquifers - geophysical applications to the assessment of groundwater properties in coastal gravel and karst aquifersen_IE
dc.typeThesisen_IE
dc.contributor.funderDepartment of Communications, Energy and Natural Resources National Geoscience Programme 2007-2013 (Griffith Geoscience post-graduate fellowship)en_IE
dc.description.embargo2020-05-19
dc.local.finalYesen_IE
nui.item.downloads1


Files in this item

Attribution-NonCommercial-NoDerivs 3.0 Ireland
This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. Please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.

The following license files are associated with this item:

Thumbnail

This item appears in the following Collection(s)

Show simple item record