Investigating the spatio-temporal variability in groundwater and surface water interactions: A multi-technique approach. Unland, N. P., Cartwright, I., Andersen, M. S., Rau, G. C, Reed, J., Gilfedder, B. S., Atkinson, A. P., & Hofmann, H. Hydrology and Earth System Sciences, 17(9):3437-3453, 2013. doi abstract bibtex The interaction between groundwater and surface water along the Tambo and Nichol-son Rivers, southeast Australia, was investigated using 222 Rn, Cl, differential flow gauging, head gradients, electrical conductivity (EC) and temperature profiling. Head gradients, temperature profiles, Cl concentrations and 222 Rn activities all indicate 5 higher groundwater fluxes to the Tambo River in areas of increased topographic variation where the potential to form large groundwater�surface water gradients is greater. Groundwater discharge to the Tambo River calculated by Cl mass balance was significantly lower (1.48 � 10 4 to 1.41 � 10 3 m 3 day -1) than discharge estimated by 222 Rn mass balance (5.35 � 10 5 to 9.56 � 10 3 m 3 day -1) and differential flow gaug-10 ing (5.41 � 10 5 to 6.30 � 10 3 m 3 day -1). While groundwater sampling from the bank of the Tambo River was intended to account for the variability in groundwater chemistry associated with river-bank interaction, the spatial variability under which these inter-actions occurs remained unaccounted for, limiting the use of Cl as an effective tracer. Groundwater discharge to both the Tambo and Nicholson Rivers was the highest un-15 der high flow conditions in the days to weeks following significant rainfall, indicating that the rivers are well connected to a groundwater system that is responsive to rain-fall. Groundwater constituted the lowest proportion of river discharge during times of increased rainfall that followed dry periods, while groundwater constituted the highest proportion of river discharge under baseflow conditions (21.4 % of the Tambo in April 20 2010 and 18.9 % of the Nicholson in September 2010).
@Article{Unland-2013,
author = {Unland, N. P. and Cartwright, I. and Andersen, M. S. and Rau, Gabriel C and Reed, J. and Gilfedder, B. S. and Atkinson, A. P. and Hofmann, H.},
title = {{Investigating the spatio-temporal variability in groundwater and surface water interactions: A multi-technique approach}},
journal = {Hydrology and Earth System Sciences},
year = {2013},
date = {2013-07-29},
volume = {17},
number = {9},
pages = {3437-3453},
issn = {10275606},
if = {3.990},
snip = {1.392},
abstract = {The interaction between groundwater and surface water along the Tambo and Nichol-son Rivers, southeast Australia, was investigated using 222 Rn, Cl, differential flow gauging, head gradients, electrical conductivity (EC) and temperature profiling. Head gradients, temperature profiles, Cl concentrations and 222 Rn activities all indicate 5 higher groundwater fluxes to the Tambo River in areas of increased topographic variation where the potential to form large groundwater�surface water gradients is greater. Groundwater discharge to the Tambo River calculated by Cl mass balance was significantly lower (1.48 � 10 4 to 1.41 � 10 3 m 3 day -1) than discharge estimated by 222 Rn mass balance (5.35 � 10 5 to 9.56 � 10 3 m 3 day -1) and differential flow gaug-10 ing (5.41 � 10 5 to 6.30 � 10 3 m 3 day -1). While groundwater sampling from the bank of the Tambo River was intended to account for the variability in groundwater chemistry associated with river-bank interaction, the spatial variability under which these inter-actions occurs remained unaccounted for, limiting the use of Cl as an effective tracer. Groundwater discharge to both the Tambo and Nicholson Rivers was the highest un-15 der high flow conditions in the days to weeks following significant rainfall, indicating that the rivers are well connected to a groundwater system that is responsive to rain-fall. Groundwater constituted the lowest proportion of river discharge during times of increased rainfall that followed dry periods, while groundwater constituted the highest proportion of river discharge under baseflow conditions (21.4 {\%} of the Tambo in April 20 2010 and 18.9 {\%} of the Nicholson in September 2010).},
doi = {10.5194/hess-17-3437-2013},
language = {English},
type = {Journal article},
}
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