Groundwater isotopic record in southwest Australia: links to recharge variations and climatic conditions

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dc.contributor.authorPriestley, SCen_AU
dc.date.accessioned2020-06-12T01:55:28Zen_AU
dc.date.available2020-06-12T01:55:28Zen_AU
dc.date.issued2018-12-10en_AU
dc.date.statistics2020-06-01en_AU
dc.description.abstractGroundwater resources are a reliable and important source of water. Considering most large groundwater basins can contain ‘old’ groundwater where extraction exceeds groundwater recharge, knowledge of the past conditions and timing under which groundwater was recharged is needed to sustainably manage groundwater resources. Applying isotopic tools to groundwater contained in regional aquifer systems can provide low-resolution information on recharge intensity, recharge source and past climatic conditions for the region. Furthermore, an understanding of how groundwater recharge and climate have been connected in the past can be used to inform climate adaptation strategies for sustaining groundwater resources during climate change. Large regional groundwater systems, contained within the Perth Basin in southwest Australia were investigated in this study to provide information on groundwater recharge and climate over the past 35,000 years. Regional scale databases containing groundwater age and isotopic records are not commonly developed in Australia and are generally more site specific. Therefore, this Perth Basin database provides a unique opportunity to study and interpret a low-resolution palaeo-archive of groundwater recharge for southwest Australia. Groundwater ages (14CDIC) and stable O isotopes of water (δ18O) from two regional groundwater systems within the Perth Basin have been collated and groundwater ages calculated. The trends δ18O over time in the regional groundwater data are consistent with the groundwater flow line data supporting our hypothesis that groundwater δ18O is a proxy for palaeo-recharge. The Southern Perth Basin groundwater isotope record is interpreted to be a low resolution archive of recharge driven by changes in the relative intensity of past rainfall and recharge thresholds. This long-term stable isotopic recharge record provides a greater understanding of groundwater palaeo-recharge, as well as how recharge and climate have been connected in the past. © Author(s)en_AU
dc.identifier.citationPriestley, S. (2018). Groundwater isotopic record in southwest Australia: links to recharge variations and climatic conditions. Paper presented at AQUA Biennial Conference, Canberra, 10-14 December 2018. (pp. 53). https://aqua.org.au/wp-content/uploads/2019/10/AQUA-2018-Program.pdfen_AU
dc.identifier.conferenceenddate14 December 2018en_AU
dc.identifier.conferencenameAQUA Biennial Conferenceen_AU
dc.identifier.conferenceplaceCanberra, Australiaen_AU
dc.identifier.conferencestartdate10 December 2018en_AU
dc.identifier.govdoc9650en_AU
dc.identifier.pagination53en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9607en_AU
dc.language.isoenen_AU
dc.publisherAustraliasian Quaternary Association Inc.en_AU
dc.subjectGround wateren_AU
dc.subjectClimatesen_AU
dc.subjectWateren_AU
dc.subjectWater reservoirsen_AU
dc.subjectIsotopesen_AU
dc.subjectAustraliaen_AU
dc.subjectWestern Australiaen_AU
dc.subjectGroundwater rechargeen_AU
dc.titleGroundwater isotopic record in southwest Australia: links to recharge variations and climatic conditionsen_AU
dc.typeConference Abstracten_AU
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