Assessment of interaction between alluvial, volcanic and GAB aquifers using 3D visualisation and environmental tracers, Lockyer Valley, southeast Queensland, Australia

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dc.contributor.authorRaiber, Men_AU
dc.contributor.authorCox, MEen_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorHartland, Aen_AU
dc.date.accessioned2022-11-07T05:26:04Zen_AU
dc.date.available2022-11-07T05:26:04Zen_AU
dc.date.issued2012-08-05en_AU
dc.date.statistics2022-01-28en_AU
dc.description.abstractA detailed 3D lithological model framework was developed using GOCAD software to understand interactions between alluvial, volcanic and GAB aquifers and the spatial and temporal distribution of groundwater recharge to the alluvium of the Lockyer Valley. Groundwater chemistry, isotope data (H20-δ2H and δ18O , 87Sr/86Sr, 3H and 14C) and groundwater level time-series data from approximately 550 observation wells were integrated into the catchment-wide 3D model to assess the recharge processes involved. This approach enabled the identification of zones where recharge to the alluvium primarily occurs from stream water during episodic flood events. Importantly, the study also demonstrates that in some sections of the alluvium recharge is also from storm rainfall and seepage discharge from the underlying GAB aquifers. These other sources of recharge are indicated by (a) the absence of a response of groundwater levels to flooding in some areas, (b) old radiocarbon ages, and (c) distinct bedrock water chemistry and δ2H and δ18O signatures in alluvial groundwater at these locations. Integration of isotopes, water chemistry and time-series displays of groundwater levels before and after the 2010/2011 flood into the 3D model suggest that the spatial variations in the alluvial groundwater response are mostly controlled by valley morphology and lithological (i.e. permeability) variations within the alluvium. Examination of the groundwater level variations in the 3D model also enabled quantification of the volumetric change of groundwater stored in the unconfined alluvial aquifer prior to and post-flood events.en_AU
dc.identifier.citationRaiber, M., Cox, M. E., Cendón, D. I., & Hartland, A. (2012). Assessment of interaction between alluvial, volcanic and GAB bedrock aquifers using 3D visualisation and environmental tracers, Lockyer Valley, southeast Queensland, Australia. Presentation to the 34th International Geological Congress 2012, "Unearthing our Past and Future - Resourcing Tomorrow", Brisbane, Australia, 5-10 August 2012, (pp. 4029).en_AU
dc.identifier.conferenceenddate10 August 2012en_AU
dc.identifier.conferencename34th International Geological Congress 2012, "Unearthing our Past and Future - Resourcing Tomorrow"en_AU
dc.identifier.conferenceplaceBrisbane, Australiaen_AU
dc.identifier.conferencestartdate5 August 2012en_AU
dc.identifier.otherGC123737en_AU
dc.identifier.pagination4029en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13999en_AU
dc.language.isoenen_AU
dc.publisherAustralian Geosciences Councilen_AU
dc.subjectAlluvial depositsen_AU
dc.subjectVolcanic rocksen_AU
dc.subjectAquifersen_AU
dc.subjectTracer techniquesen_AU
dc.subjectEnvironmenten_AU
dc.subjectQueenslanden_AU
dc.subjectAustraliaen_AU
dc.subjectModelingen_AU
dc.subjectGround wateren_AU
dc.subjectGroundwater rechargeen_AU
dc.titleAssessment of interaction between alluvial, volcanic and GAB aquifers using 3D visualisation and environmental tracers, Lockyer Valley, southeast Queensland, Australiaen_AU
dc.typeConference Abstracten_AU
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