Freshwater recharge into a shallow saline groundwater system, Cooper Creek floodplain, Queensland, Australia

Cendon, Dioni I. and Larsen, Joshua R. and Jones, Brian G. and Nanson, Gerald C. and Rickleman, Daniel and Hankin, Stuart I. and Pueyo, Juan J. and Maroulis, Jerry (2010) Freshwater recharge into a shallow saline groundwater system, Cooper Creek floodplain, Queensland, Australia. Journal of Hydrology, 392 (3-4). pp. 150-163. ISSN 0022-1694


Freshwater lenses have been identified as having penetrated the shallow regional saline groundwater beneath the Cooper Creek floodplain near Ballera (south-west Queensland). Piezometers were installed to evaluate the major-element chemistry along a floodplain transect from a major waterhole (Goonbabinna)to a smaller waterhole (Chookoo) associated with a sand dune complex. The floodplain consists of 2–7 m of impermeable mud underlain by unconsolidated fluvial sands with a saline watertable. Waterholes have in places scoured into the floodplain. The transect reveals that groundwater recharge takes
place through the base of the waterholes at times of flood scour, but not through the floodplain mud.
Total dissolved solids rise with distance from the waterhole and independently of the presence of sand
dunes. Stable water isotopes (d2H and d18O) confirm that recharge is consistent with, and dependant on, monsoonal flooding events. Following floods, the waterholes self-seal and retain water for extended periods, with sulfate-d34S and d18O isotopes suggesting bacterial reduction processes within the hyporheic zone, and limited interaction between the surface water and groundwater during no-flow conditions.
The area occupied by the freshwater lenses (TDS < 5000 mg/L) is locally asymmetrical with respect to the channel flow direction, extending down gradient along distances of ~300 m.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Faculty / Department / School: Historic - Faculty of Education
Date Deposited: 24 Feb 2011 11:21
Last Modified: 25 Aug 2014 03:17
Uncontrolled Keywords: arid zone river; Lake Eyre basin; shallow groundwater; stable isotopes; freshwater lenses; Cooper Creek
Fields of Research : 05 Environmental Sciences > 0599 Other Environmental Sciences > 059999 Environmental Sciences not elsewhere classified
03 Chemical Sciences > 0301 Analytical Chemistry > 030199 Analytical Chemistry not elsewhere classified
09 Engineering > 0905 Civil Engineering > 090509 Water Resources Engineering
Socio-Economic Objective: D Environment > 96 Environment > 9699 Other Environment > 969999 Environment not elsewhere classified
D Environment > 96 Environment > 9605 Ecosystem Assessment and Management > 960506 Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments
Identification Number or DOI: 10.1016/j.hydrol.2010.08.003

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