Groundwater residence time in the Condamine River Alluvial Aquifer (SE-QLD)

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dc.contributor.authorCendón, DIen_AU
dc.contributor.authorIverach, CPen_AU
dc.contributor.authorHankin, SIen_AU
dc.contributor.authorKelly, BFJen_AU
dc.date.accessioned2021-12-24T00:22:57Zen_AU
dc.date.available2021-12-24T00:22:57Zen_AU
dc.date.issued2017-07-11en_AU
dc.description.abstractMany gigalitres of groundwater have been extracted from the Condamine River Alluvial Aquifer (CRAA) since the 1960s. These groundwater withdrawals have stressed the system and locally altered the groundwater flow paths. Isotopes can provide powerful insights into recharge pathways, flow direction, and the sustainability of groundwater withdrawals from alluvial aquifers. To address some of the regional groundwater concerns we must characterise alluvial groundwater residence time. A total of 31 groundwater samples were collected from privately owned irrigation bores and Qld-DNRM government monitoring bores in the region between Condamine Plains and Dalby. Parameters analysed included: 3H, 14CDIC, 222Rn, 87Sr/86Sr, δ13CDIC, water δ2H and δ18O, sulfate δ34S and δ18O as well major, trace and REE elements. Distance from primary recharge areas (rivers) provides the main control on groundwater residence time in the CRAA. This is supported by the following observations: 1) Groundwater between the Condamine River and its northern branch has low TDS (~400 mg/L), is Na-HCO3-type and has detectable 3H, indicating a proportion of modern recharge (<70 years); 2) Groundwater east of the northern branch has higher TDS (~700 mg/L) and is Na-HCO3- -type with increasing eastern inputs. No 3H is detected and 14C shows sub-modern groundwater (~500 years); 3) Groundwater along the eastern and western boundaries of the alluvium or samples retrieved from the Walloon Coal Measures (WCM) have high TDS (1,250-19,770 mg/L) and are Na-Cl-type. Residence times in the upper WCM increase along the flow path to the west from modern to 32,000 years on the western side. Groundwater residence time distributions provide a visualisation of recharge processes and delineate areas where groundwater withdrawals are less sustainable within the CRAA.en_AU
dc.identifier.citationCendón D. I., Iverach C. P., Hankin S. I., & Kelly B. F. J (2017). Groundwater residence time in the Condamine River alluvial aquifer (SE-QLD). Poster presented to the 2017 Biennial Australasian Groundwater Conference, UNSW Sydney, 11 - 13 July 2017. Retrieved from: http://agc-2017.p.agc2017.currinda.com/days/2017-07-11/abstract/251en_AU
dc.identifier.conferenceenddate13 July 2017en_AU
dc.identifier.conferencename2017 Biennial Australasian Groundwater Conferenceen_AU
dc.identifier.conferenceplaceSydney, Australiaen_AU
dc.identifier.conferencestartdate11 July 2017en_AU
dc.identifier.urihttp://agc-2017.p.agc2017.currinda.com/days/2017-07-11/abstract/251en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12662en_AU
dc.language.isoenen_AU
dc.publisherNational Centre for Groundwater Research And Trainingen_AU
dc.subjectGround wateren_AU
dc.subjectQueenslanden_AU
dc.subjectAustraliaen_AU
dc.subjectAquifersen_AU
dc.subjectIsotopesen_AU
dc.subjectRiversen_AU
dc.subjectWateren_AU
dc.subjectCarbon 14en_AU
dc.subjectSamplingen_AU
dc.titleGroundwater residence time in the Condamine River Alluvial Aquifer (SE-QLD)en_AU
dc.typeConference Presentationen_AU
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