Understanding groundwater dynamics on barrier islands using geochronological data: an example from North Stradbroke Island, South-east Queensland

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dc.contributor.authorHofmann, Hen_AU
dc.contributor.authorNewborn, Den_AU
dc.contributor.authorCartwright, Ien_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorRaiber, Men_AU
dc.date.accessioned2022-01-17T22:34:44Zen_AU
dc.date.available2022-01-17T22:34:44Zen_AU
dc.date.issued2015-11-03en_AU
dc.date.statistics2021-11-04en_AU
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_AU
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_AU
dc.identifier.conferenceenddate5 November 2015en_AU
dc.identifier.conferencenameAustralian Groundwater Conferenceen_AU
dc.identifier.conferenceplaceCanberra, Australiaen_AU
dc.identifier.conferencestartdate3 November 2015en_AU
dc.identifier.urihttp://groundwater.com.au/documents/conference-program_2015.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12693en_AU
dc.language.isoenen_AU
dc.publisherNational Centre for Groundwater Research And Trainingen_AU
dc.subjectGround wateren_AU
dc.subjectDataen_AU
dc.subjectQueenslanden_AU
dc.subjectIslandsen_AU
dc.subjectAustraliaen_AU
dc.subjectCarbon 14en_AU
dc.subjectTideen_AU
dc.subjectSeasen_AU
dc.subjectFresh wateren_AU
dc.subjectAquifersen_AU
dc.subjectGroundwater rechargeen_AU
dc.titleUnderstanding groundwater dynamics on barrier islands using geochronological data: an example from North Stradbroke Island, South-east Queenslanden_AU
dc.typeConference Abstracten_AU
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