Isoscapes: a 3D visualisation approach to study aquifer connectivity during drought and flood, 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.contributor.authorJames, Aen_AU
dc.date.accessioned2022-10-24T01:54:25Zen_AU
dc.date.available2022-10-24T01:54:25Zen_AU
dc.date.issued2013-09-16en_AU
dc.date.statistics2022-01-24en_AU
dc.description.abstractA 3D geological model of the Lockyer Valley, southeast Queensland, was developed using GOCAD software as a framework to study interactions between alluvial, basaltic and sedimentary bedrock aquifers of the Clarence-Moreton Basin and the spatial and temporal variability of recharge to the alluvium. The isotopic data (δ2h and δ18O, 87Sr/86Sr, 3H and 14C), water chemistry and time-series of groundwater levels before and after the 2010/2011 flood, were integrated within the 3D hydrogeological framework using Groundwater Visualisation System (GVS). Groundwater “isoscapes" (i.e. isotopic landscapes) were developed by spatial interpolation of isotopic results from more than 180 bores to enable the identification of different sources of water that contribute to recharge. The isotopic parameters are displayed as colour-contoured surfaces of the different aquifers and as coloured cylinders of variable thickness marking the position and thickness of the screened interval. Interpretation of isotopic values and their spatial relationships show that recharge to the alluvium primarily occurs from streams following episodic flood events. However, importantly, the study also demonstrates that in some sections of the alluvial plain, recharge to the alluvium is derived from both diffuse rainfall recharge and seepage discharge from the underlying Great Artesian Basin (GAB) aquifers. Bedrock seepage recharge dominates in some parts of the alluvial aquifer during droughts, enhanced by continuous pumping of the alluvial aquifer during the drought, as indicated by overall longer groundwater residence times, and high groundwater salinities. In addition, the hydrochemical signature of recharge from the bedrock is characterised by an isotopic depletion of δ2H and δ18O, and more radiogenic 87Sr/86Sr ratios in alluvial groundwater. The spatial variability of the responses is mostly controlled by catchment morphology and lithological (i.e. permeability) variations within the alluvium. Assessment of the unconfined groundwater levels in the 3D geological model enabled quantification of the volumetric change of groundwater stored in the alluvial aquifer system before and after flood events.en_AU
dc.identifier.citationRaiber, M., Cox, M. E., Cendón, D. I., Hartland, A., & James A. (2013) Isoscapes: a 3D visualisation approach to study aquifer connectivity during drought and flood, Lockyer Valley, southeast Queensland, Australia. Paper presented to IAH 2013 Perth Australia : "Solving the groundwater challenges of the 21st century", International Association of Hydrogeologists 40th International Conference, Perth, Western Australia, 15-20 September 2013, (pp. 69).en_AU
dc.identifier.conferenceenddate20 September 2013en_AU
dc.identifier.conferencenameIAH 2013 Perth Australia : "Solving the groundwater challenges of the 21st century", International Association of Hydrogeologists 40th International Conferenceen_AU
dc.identifier.conferenceplacePerth, Western Australiaen_AU
dc.identifier.conferencestartdate15 September 2013en_AU
dc.identifier.otherSession Four C, 677en_AU
dc.identifier.pagination69en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13917en_AU
dc.language.isoenen_AU
dc.publisherInternational Association of Hydrogeologistsen_AU
dc.subjectSimulationen_AU
dc.subjectValleysen_AU
dc.subjectQueenslanden_AU
dc.subjectAustraliaen_AU
dc.subjectSedimentary basinsen_AU
dc.subjectAlluvial depositsen_AU
dc.subjectGroundwater rechargeen_AU
dc.subjectCarbon 14en_AU
dc.subjectAquifersen_AU
dc.subjectFloodsen_AU
dc.titleIsoscapes: a 3D visualisation approach to study aquifer connectivity during drought and flood, Lockyer Valley, southeast Queensland, Australia,en_AU
dc.typeConference Abstracten_AU
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