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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/9667

Title: Investigation ofδ18Oandδ2Hin the Namoi River catchment—elucidating recharge sources and the extent of sur-face water/groundwater interaction
Authors: Andersen, MS
Meredith, KT
Timms, W
Acworth, RI
Keywords: Australia
New South Wales
Rivers
Isotopes
Ground water
Arid lands
Catchment basins
Rain water
Evaporation
Issue Date: 26-Oct-2008
Publisher: The Authors
Citation: Andersen, M.S., Meredith, K., Timms, W., & Acworth, R.I. (2008). Investigation ofδ18Oandδ2Hin the Namoi River catchment — elucidating recharge sources and the extent of sur-face water/groundwater interaction. Integrating Groundwater Science and HumanWell-being Congress of IAH Toyama City, 36th, Japan, 26–31 October 2008.
Abstract: Stable isotopes 18O and 2H were analysed in water samples from rainfall, surface water and groundwater within the semi-arid Namoi River catchment in NSW, Australia.The isotopic composition of rainfall events and groundwater samples plot along the Local Meteoric Water Line (LMWL). In contrast, the surface water samples of the Namoi River clearly show signs of evaporative enrichment and plot on a Local Evaporation Line (LEL) constructed for the area based on δ18O and δ2H time-series for surface waters of the Namoi River. The river samples have a distinctly lower slope than the LMWL which is due to evaporation. Shallow groundwater near the Namoi River shows considerable enrichment compared to average groundwater signatures and plots in between the LMWL and the LEL on a δ2H vs. δ18O graph. These results clearly indicate that the Namoi River is recharging the shallow aquifer system. Conversely, the isotopic composition of surface water in the tributaries of Maules and Horsearm creeks are similar to groundwater indicating that these creeks are receiving groundwater discharge. This study reveals many complex hydrological processes occurring in the catchment. It would not have been possible to elucidate these processes without the use of stable isotope data.
URI: http://apo.ansto.gov.au/dspace/handle/10238/9667
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