Document Detail


Noble gas and major element constraints on the water dynamics in an alpine floodplain.
MedLine Citation:
PMID:  11708450     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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-SO4-dominated water from the main river and Ca-HCO3-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 of the deeper aquifer zone indicates the isolation of the deeper ground water from the main river.
Authors:
J Holocher; V Matta; W Aeschbach-Hertig; U Beyerle; M Hofer; F Peeters; R Kipfer
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ground water     Volume:  39     ISSN:  0017-467X     ISO Abbreviation:  Ground Water     Publication Date:    2001 Nov-Dec
Date Detail:
Created Date:  2001-11-15     Completed Date:  2002-02-20     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9882886     Medline TA:  Ground Water     Country:  United States    
Other Details:
Languages:  eng     Pagination:  841-52     Citation Subset:  IM    
Affiliation:
Department of Water Resources and Drinking Water, Swiss Federal Institute of Environmental Science and Technology, Duebendorf. johannes.holocher@eawag.ch
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MeSH Terms
Descriptor/Qualifier:
Geological Phenomena
Geology
Ions
Minerals
Noble Gases / chemistry*
Rain
Seasons
Soil*
Water / chemistry*
Water Movements
Chemical
Reg. No./Substance:
0/Ions; 0/Minerals; 0/Noble Gases; 0/Soil; 7732-18-5/Water

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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