Reconciling contradictory environmental tracer ages in multi-tracer studies to characterize the aquifer and quantify deep groundwater flow: an example from the Hutton Sandstone, Great Artesian Basin, Australia

Suckow, Axel; Deslandes, Alec; Raiber, Matthias; Taylor, Andy; Davies, Phil; Gerber, Christoph; Leaney, Fred

Reconciling contradictory environmental tracer ages in multi-tracer studies to characterize the aquifer and quantify deep groundwater flow: an example from the Hutton Sandstone, Great Artesian Basin, Australia | Widersprüchliche Wasseralter von Umwelttracern charakterisieren die Eigenschaften eines gespannten Aquifer Systems und quantifizieren effektive tiefe Grundwasserneubildung am Beispiel des Hutton Sandstein, Großes Artesisches Becken, Australien Réconcilier les âges contradictoires issus de traceurs environnementaux dans les études multi-traceurs pour caractériser les aquifères et quantifier les écoulements d’eaux souterraines profonds: un exemple des Grès de Hutton, Grand Bassin Artésien, Australie Arreglos de edades contradictorias de trazadores ambientales en estudios de múltiples trazadores para caracterizar el acuífero y cuantificar el flujo de agua subterránea profunda: un ejemplo de la Hutton Sandstone, Great Artesian Basin, Australia 多示踪研究中解释相互矛盾的环境示踪剂年龄以表征含水层和量化深部地下水流:以澳大利亚大自流盆地Hutton砂岩为例 Reconciliando as idades contraditórias do traçador ambiental em estudos com múltiplos traçadores para caracterizar o aquífero e quantificar o fluxo profundo de águas subterrâneas: um exemplo do Arenito Hutton, Grande Bacia Artesiana, Austrália

2020

The effective deep recharge to the Hutton Sandstone, a major confined aquifer of the Surat Basin, Australia, has been quantified for the first time with the aid of environmental tracers. A factor of ten discrepancy was found when deriving groundwater flow velocities from applying the environmental tracers ¹⁴C and ³⁶Cl. It was possible to reconcile these contradictory results describing the Hutton Sandstone as a dual porosity system, in which a significant part of the tracer is not only lost by radioactive decay, but also by diffusion into stagnant zones of the aquifer. The conceptual and mathematical description of this process allowed for quantification of the effective deep recharge into this aquifer. The resulting recharge value is only a small percentage (~3%) of earlier estimates using chloride mass balance. The chloride mass balance probably gives a correct shallow infiltration rate but most of that infiltration is diverted to springs and surface water nearby (“rejected recharge”). Only a small fraction of recharge finally reaches the deeper system. These results are significant for water resource quantification from groundwater in deep confined systems. The presented dual porosity reconceptualization is likely applicable to a significant number of earlier studies that apply environmental tracers to old groundwater, and indicates that those original results may actually give too small values for groundwater velocity and too large estimates of recharge. This reconceptualization may be particularly valid for systems that include old groundwater and that have limited spatial and temporal coverage of tracer data such as the Great Artesian Basin.

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