Articles | Volume 18, issue 12
https://doi.org/10.5194/hess-18-5109-2014
https://doi.org/10.5194/hess-18-5109-2014
Research article
 | 
12 Dec 2014
Research article |  | 12 Dec 2014

Residence times and mixing of water in river banks: implications for recharge and groundwater–surface water exchange

N. P. Unland, I. Cartwright, D. I. Cendón, and R. Chisari

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Short summary
Periodic flooding of rivers should result in increased groundwater recharge near rivers and thus - younger and fresher groundwater near rivers. This study found the age and salinity of shallow groundwater to increase with proximity to the Tambo River in South East Australia. This appears to be due to the upwelling of older, regional groundwater closer the river. Other chemical parameters are consistent with this. This is a process that may be occurring in other similar river systems.