Tracing the age, origins and hydrodynamics of groundwater and surface water exchange in river banks

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dc.contributor.authorUnland, NPen_AU
dc.contributor.authorCartwright, Ien_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorChisari, Ren_AU
dc.date.accessioned2022-07-22T01:55:54Zen_AU
dc.date.available2022-07-22T01:55:54Zen_AU
dc.date.issued2013-09-17en_AU
dc.date.statistics2022-01-24en_AU
dc.description.abstractIt is common for groundwater-surface water assessments to be conducted within streams at discrete time intervals in order to characterise the gaining or losing nature of a stream and the volumetric flux of water between the two reservoirs. While these studies offer sound scientific information for one point in time, they often overlook the dynamics of groundwater and surface water interaction under changing hydrologic conditions. This study couples discrete sampling for hydrochemical parameters with the continuous monitoring of physical parameters at multiple locations. in taking this approach the interaction between river water and groundwater stored in river banks can be assessed over space and time, allowing for both the qualitative and quantitative impacts of water exchange to be assessed. Continuous analysis of groundwater head levels and electrical conductivity indicates the presence of a semi conned aquifer of increased salinity underlying an unconfined aquifer of lower salinity in the region. Carbon-14 and tritium results indicate that groundwater in the underlying aquifer is significantly older than that of the unconfined aquifer, with variable mixing between the two resulting a range of intermediate ages. While discrete sampling and temperature profiling of river water indicates a predominantly gaining system, reversal of hydraulic gradients during periods of increased rainfall and river discharge indicates a change to losing conditions. Although this indicates the occurrence of bank infiltration, an initial increase in groundwater electrical conductivity during increased river discharge suggests that increased leakage from the semi-confined aquifer dominates groundwater chemistry at these times. The degree to which this occurs varies between locations and the scale of discharge events. This study illustrates the complexity and variability by which groundwater-surface water interactions can occur within river banks.en_AU
dc.identifier.citationUnland, N. P., Cartwright, I., Cendón, D. I., & Chisari R. (2013). Tracing the age, origins and hydrodynamics of groundwater and surface water exchange in river banks. Paper presented to the IAH 2013, Perth, Australia : "Solving the groundwater challenges of the 21st century", International Association of Hydrogeologists 40th International Conference, Perth, Western Australia, 15-20 September 2013, (pp. 117).en_AU
dc.identifier.conferenceenddate20 September 2013en_AU
dc.identifier.conferencenameIAH 2013 Perth Australia : 'Solving the groundwater challenges of the 21st century', International Association of Hydrogeologists 40th International Conferenceen_AU
dc.identifier.conferenceplacePerth, Western Australiaen_AU
dc.identifier.conferencestartdate15 September 2013en_AU
dc.identifier.otherSession Two C, 429en_AU
dc.identifier.pagination117en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13417en_AU
dc.language.isoenen_AU
dc.publisherInternational Association of Hydrogeologistsen_AU
dc.subjectAge estimationen_AU
dc.subjectOriginen_AU
dc.subjectHydrodynamicsen_AU
dc.subjectGround wateren_AU
dc.subjectSurface watersen_AU
dc.subjectRiversen_AU
dc.subjectStreamsen_AU
dc.subjectWateren_AU
dc.subjectElectric conductivityen_AU
dc.subjectAquifersen_AU
dc.titleTracing the age, origins and hydrodynamics of groundwater and surface water exchange in river banksen_AU
dc.typeConference Abstracten_AU
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