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| Titel |
Investigating the spatio-temporal variability in groundwater and surface water interactions: a multi-technique approach |
| VerfasserIn |
N. P. Unland, I. Cartwright, M. S. Andersen, G. C. Rau, J. Reed, B. S. Gilfedder, A. P. Atkinson, H. Hofmann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 9 ; Nr. 17, no. 9 (2013-09-06), S.3437-3453 |
| Datensatznummer |
250085925
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| Publikation (Nr.) |
 copernicus.org/hess-17-3437-2013.pdf |
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| Zusammenfassung |
| The interaction between groundwater and surface water along the Tambo and
Nicholson rivers, southeast Australia, was investigated using 222Rn,
Cl, differential flow gauging, head gradients, electrical conductivity (EC)
and temperature profiles. Head gradients, temperature profiles, Cl
concentrations and 222Rn activities all indicate 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 × 104 to 1.41 × 103 m3 day−1)
than discharge estimated by 222Rn mass balance
(5.35 × 105 to 9.56 × 103 m3 day−1)
and differential flow gauging (5.41 × 105 to 6.30 × 103 m3 day−1) due to bank return waters. While groundwater
sampling from the bank of the Tambo River was intended to account for
changes in groundwater chemistry associated with bank infiltration,
variations in bank infiltration between sample sites remain unaccounted
for, limiting the use of Cl as an effective tracer. Groundwater discharge to
both the Tambo and Nicholson rivers was the highest under 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 rainfall. 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 2010 and
18.9% of the Nicholson in September 2010). |
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