Publikation:

Noble gas and major element constraints on the water dynamics in an alpine floodplain

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2001

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Holocher, Johannes
Matta, Vijay
Aeschbach-Hertig, Werner
Beyerle, Urs
Hofer, Markus
Kipfer, Rolf

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Ground Water. 2001, 39(6), pp. 841-852. eISSN 0017-467X. Available under: doi: 10.1111/j.1745-6584.2001.tb02472.x

Zusammenfassung

The hydrogeological system of an ecologically sensitive alpine floodplain in the Valle di Blenio, Switzerland, was investigated using hydrochemical and 3H-3He dating methods. Water samples from six wells and from different surface locations were analyzed. The analysis of the concentrations of major ions in conjunction with age determination by the 3H-3He-method allowed the main hydrological properties of the system to be consistently characterized. Two geochemically distinct water zones can be distinguished: Ca-S04-dominated water from the main river and Ca-HC03-dominated floodplain water. The floodplain water component characterizes the whole floodplain including the surficial hillslope drainage system. Within the ground water samples, two spatially and temporally different types of water can be determined. A younger (age < 1.5 years), less mineralized water is found in the upper part of the aquifer during the summer season. The underlying aquifer zone contains older and more highly mineralized water. However, the general hydrochemical characterization of both types of ground water is similar. In winter, the water ages increase with decreasing ground water levels. Because precipitation is stored temporarily in the snow cover, the contribution of the younger near-surface ground water decreases, resulting in higher apparent water ages and higher mineralization in the upper zone of the aquifer. Water exchange between the main river and the ground water system is limited to ground water exfiltration from the shallow aquifer zone, whereas the hydrochemical separation ofthe deeper aquifer zone indicates the isolation of the deeper ground water from the main river.

Zusammenfassung in einer weiteren Sprache

Fachgebiet (DDC)
570 Biowissenschaften, Biologie

Schlagwörter

Noble gas, Major Element, Water Dynamics, Alpine Floodplain, Valle die Blenio, ground water

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ISO 690HOLOCHER, Johannes, Vijay MATTA, Werner AESCHBACH-HERTIG, Urs BEYERLE, Markus HOFER, Frank PEETERS, Rolf KIPFER, 2001. Noble gas and major element constraints on the water dynamics in an alpine floodplain. In: Ground Water. 2001, 39(6), pp. 841-852. eISSN 0017-467X. Available under: doi: 10.1111/j.1745-6584.2001.tb02472.x
BibTex
@article{Holocher2001Noble-8099,
  year={2001},
  doi={10.1111/j.1745-6584.2001.tb02472.x},
  title={Noble gas and major element constraints on the water dynamics in an alpine floodplain},
  number={6},
  volume={39},
  journal={Ground Water},
  pages={841--852},
  author={Holocher, Johannes and Matta, Vijay and Aeschbach-Hertig, Werner and Beyerle, Urs and Hofer, Markus and Peeters, Frank and Kipfer, Rolf}
}
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    <dcterms:abstract xml:lang="eng">The hydrogeological system of an ecologically sensitive alpine floodplain in the Valle di Blenio, Switzerland, was investigated using hydrochemical and 3H-3He dating methods. Water samples from six wells and from different surface locations were analyzed. The analysis of the concentrations of major ions in conjunction with age determination by the 3H-3He-method allowed the main hydrological properties of the system to be consistently characterized. Two geochemically distinct water zones can be distinguished: Ca-S04-dominated water from the main river and Ca-HC03-dominated floodplain water. The floodplain water component characterizes the whole floodplain including the surficial hillslope drainage system. Within the ground water samples, two spatially and temporally different types of water can be determined. A younger (age &lt; 1.5 years), less mineralized water is found in the upper part of the aquifer during the summer season. The underlying aquifer zone contains older and more highly mineralized water. However, the general hydrochemical characterization of both types of ground water is similar. In winter, the water ages increase with decreasing ground water levels. Because precipitation is stored temporarily in the snow cover, the contribution of the younger near-surface ground water decreases, resulting in higher apparent water ages and higher mineralization in the upper zone of the aquifer. Water exchange between the main river and the ground water system is limited to ground water exfiltration from the shallow aquifer zone, whereas the hydrochemical separation ofthe deeper aquifer zone indicates the isolation of the deeper ground water from the main river.</dcterms:abstract>
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