Characterization of the subsurface architecture and identification of potential groundwater paths in a clay-rich floodplain using multi-electrode resistivity imaging |
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| Authors: | Ander Guinea Suzanne Hollins Karina Meredith Stuart Hankin Dioni I Cendón |
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| Institution: | 1. Federation University Australia, FoST, Ballarat, Australia;2. Australian Nuclear Science and Technology Organisation, Kirrawee, Australia;3. Connected Waters Initiative, School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, Australia |
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| Abstract: | The interaction between surface water and groundwater in clay-rich fluvial environments can be complex and is generally poorly understood. Airborne electromagnetic surveys are often used for characterizing regional groundwater systems, but they are constrained by the resolution of the method. A resistivity imaging survey has been carried out in the Macquarie Marshes (New South Wales, Australia) in combination with water chemical sampling. The results have enabled the identification of buried palaeochannels and the location of potential recharge points. The data have been compared with previously published airborne electromagnetic data in the same area. Deeper less conductive features suggest that there is a potential connection between the Great Artesian Basin and groundwater contained within the shallow sand aquifer. Even though the chemistry of the groundwater samples does not indicate interaction with the Great Artesian Basin, the observed discontinuity in the saprolite implies potential for this to happen in other locations. |
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| Keywords: | electrical resistivity tomography recharge Macquarie marshes surface water–groundwater interactions Great Artesian Basin |
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