Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/12693
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dc.contributor.authorHofmann, H-
dc.contributor.authorNewborn, D-
dc.contributor.authorCartwright, I-
dc.contributor.authorCendón, DI-
dc.contributor.authorRaiber, M-
dc.date.accessioned2022-01-17T22:34:44Z-
dc.date.available2022-01-17T22:34:44Z-
dc.date.issued2015-11-03-
dc.identifier.citationHofmann, H., Newborn, D., Cartwright, I., Cendón, D. I., & Raiber, M. (2015). Understanding groundwater dynamics on barrier islands using geochronological data: an example from North Stradbroke Island, South-east Queensland. Paper presented to the Australian Groundwater Conference, The Shine Dome, Canberra, 3-5 November 2015. (p.98). Retrieved from: http://groundwater.com.au/documents/conference-program_2015.pdfen_US
dc.identifier.urihttp://groundwater.com.au/documents/conference-program_2015.pdfen_US
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12693-
dc.description.abstractFreshwater lenses underneath barrier islands are dynamic systems affected by changing sea levels and groundwater use. They are vulnerable to contamination and over-abstraction. Residence times of fresh groundwater in barrier islands are poorly understood and have mostly been assessed by modelling approaches and estimates without fundamental validation with chronological estimations. Assessing residence time and recharge rates will improve significantly our understanding of hydrological processes of coastal environments that will in turn allow us to make informed decisions on groundwater use and environmental protection. This project focused on groundwater recharge rates and residence times of the fresh water aquifer system of North Stradbroke Island, south-east Queensland, Australia. Groundwater bores, wetlands and submarine groundwater discharge points in the tidal areas (wonky holes) were sampled along a transect across the island and were analysed for major ion chemistry and stable isotopes (δ2H, δ18O, δ13C) in combination with 3H, 14C analysis and 222Rn. Calculated 3H using a 90% exponential-piston flow model and 14C ages range from 12 to >100 years and modern to 3770 years, respectively, indicating a highly heterogeneous aquifer system with mixing from low and high conductive areas. The major ion chemistry in combination with stable and radiogenic isotopes suggests that a significant groundwater component derives from the fractured rock basement and older sedimentary formations underlying the sand dunes of the island. The results help refining the conceptual and numerical groundwater flow model for North Stradbroke Island in this particular case but also demonstrate the possible complexity of barrier island hydrogeology.en_US
dc.language.isoenen_US
dc.publisherNational Centre for Groundwater Research And Trainingen_US
dc.subjectGround wateren_US
dc.subjectDataen_US
dc.subjectQueenslanden_US
dc.subjectIslandsen_US
dc.subjectAustraliaen_US
dc.subjectCarbon 14en_US
dc.subjectTideen_US
dc.subjectSeasen_US
dc.subjectFresh wateren_US
dc.subjectAquifersen_US
dc.subjectGroundwater rechargeen_US
dc.titleUnderstanding groundwater dynamics on barrier islands using geochronological data: an example from North Stradbroke Island, South-east Queenslanden_US
dc.typeConference Abstracten_US
dc.date.statistics2021-11-04-
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