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Distinguishing groundwater flow paths in different fractured-rock aquifers using groundwater chemistry: Dandenong Ranges, southeast Australia

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Abstract

Major ion geochemistry is used to qualitatively interpret groundwater residence times within an aquifer, and the extent of mixing between aquifers with distinctive mineralogy. In conjunction with hydraulic heads and stable isotope geochemistry, flow paths and inter-aquifer exchange are defined in a fractured-rock aquifer system in the Dandenong Ranges, southeast Australia. Stable isotopes indicate modern seasonal recharge throughout the system. At high elevations in the sub-catchment, which includes both marine Silurian-Devonian sedimentary and Tertiary basalt aquifers, Cl is derived primarily from cyclic salts, and differences in mineralogy result in groundwater from the basalt aquifer having higher TDS contents (123–262 mg/L) and (Ca+Mg)/Na ratios (0.9–1.3) than groundwater from the sedimentary aquifer (TDS: 55–79 mg/L; (Ca+Mg)/Na: 0.1–0.2). At low elevations, in areas of local groundwater discharge, the more regional flow system in the Silurian-Devonian sediments contains additional Cl from water–rock interaction and has distinctly higher TDS contents (517–537 mg/L). Differences in groundwater chemistry between the aquifers and between shallower and deeper flow systems highlights areas of inter-aquifer mixing. This is particularly important for aquifer vulnerability where groundwater quality in the deeper aquifer may be impacted by surface activities.

Résumé

Les ions majeurs sont utilisés pour interpréter quantitativement les temps de résidence des eaux souterraines dans les aquifères, et l’étendue des zones de mélange entre les aquifères de différentes minéralogies. En regard de la répartition des charges hydrauliques et des informations données par les isotopes stables, les écoulements et les échanges inter-aquifères sont définis dans un aquifère fracturé dans le Dandenong Ranges, SE de l’Australie. Les isotopes stables indiquent des recharges modernes et saisonnières à travers le système aquifère. A haute altitude dans le sous-bassin versant, qui inclut des sédiments du Siluro-Dévonien et des basaltes du Tertiaire, le chlore est d’abord dérivé des sels cycliques, et des différences minéralogiques dans les eaux souterraines sont observées selon l’aquifère : basalte tertiaire (TDS: 123–262  mg/L; Ca+Mg/Ca: 0.9 à 1.3) et sédiments primaires (TDS: 55–79 mg/L; Ca+Mg/Ca: 0.1–0.2). Aux basses altitudes, dans les zones locales de décharge des eaux souterraines, les écoulements les plus régionaux possèdent des teneurs plus élevées en Chlore en provenance des interactions eau—roche, et des TDS plus élevées (515–537 mg/L). Des différences dans la chimie des eaux souterraines entre les aquifères et entre les systèmes d’écoulement de surface et les écoulements profonds mettent en lumière les zones de mélange inter-aquifère. Ceci est particulièrement important pour la définition de la vulnérabilité où la qualité des eaux souterraines en profondeur peuvent subir les impacts des activités de surface.

Resumen

Se ha utilizado geoquímica de iones mayores para interpretar cualitativamente los tiempos de residencia del agua subterránea dentro de un acuífero, y el grado de mezcla entre acuíferos con mineralogía característica. De manera conjunta con presiones hidráulicas y geoquímica de isótopos estables, se han definido trayectorias de flujo e intercambio entre acuíferos en un sistema de acuífero de roca fracturada en las Sierras Dandenong, sureste de Australia. Los isótopos estables indican recarga estacional moderada a través del sistema. A elevaciones altas en la sub-cuenca que incluye acuíferos sedimentarios Silúrico-Devónicos y acuíferos basálticos Terciarios, Cl se deriva principalmente de sales cíclicas. Las diferencias en mineralogía resultan en agua subterránea del acuífero basáltico que tiene mayores contenidos TDS (123–262 mg/L) y mayor relación (Ca+Mg)/Na (0.9–1.3) que el agua subterránea de los acuíferos sedimentarios (TDS:55–79 mg/L; (Ca+Mg)/Na: 0.1–0.2). A elevaciones bajas, en áreas de recarga local de agua subterránea, el sistema de flujo más regional en los sedimentos Silúrico-Devónicos contiene Cl adicional que se deriva de la interacción roca-agua y típico contenido TDS más alto (517–537 mg L). Las diferencias en la química del agua subterránea entre los acuíferos y entre los sistemas de flujo más profundo y más somero resalta áreas de mezcla entre acuíferos. Esto es particularmente importante para la vulnerabilidad del acuífero donde la calidad del agua subterránea en el acuífero más profundo puede ser impactada por las actividades superficiales.

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Acknowledgements

We thank Marlen Yanni for stable isotope analysis, Peter Cook and John Dighton for CFC and radon analysis, and Ian Swane for help with fieldwork. DNRE provided access to bores in the Victorian State Observation Bore Network and the ARC funded this research. The authors also wish to thank the reviewers: P. Olcott, A. Bath, G. Darling and an anonymous reviewer, whose comments improved this paper.

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  1. School of Earth Sciences, University of Melbourne, 3010, Victoria, Australia

    S. O. Tweed & T. R. Weaver

  2. School of Geosciences, Monash University, 3800, Clayton, Australia

    I. Cartwright

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  1. S. O. Tweed
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  2. T. R. Weaver
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  3. I. Cartwright
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Correspondence to S. O. Tweed.

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Tweed, S.O., Weaver, T.R. & Cartwright, I. Distinguishing groundwater flow paths in different fractured-rock aquifers using groundwater chemistry: Dandenong Ranges, southeast Australia. Hydrogeol J 13, 771–786 (2005). https://doi.org/10.1007/s10040-004-0348-y

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