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| Titel |
Water ages of 20 groundwater bodies and its relevance for the implementation of the European Water Framework Directive |
| VerfasserIn |
Martin Kralik, Heike Brielmann, Franko Humer, Johannes Grath, Jürgen Sültenfuß, Rudolf Philippitsch |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250114273
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| Publikation (Nr.) |
 EGU/EGU2015-14587.pdf |
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| Zusammenfassung |
| The “Mean Residence Time” (MRT) of groundwater is required to develop reliable
hydrogeological concepts of groundwater bodies as a prerequisite for a qualified monitoring
and risk assessment. MRTs from monitoring wells help to assess if groundwater bodies are
“at risk” or “not at risk” failing to meet good groundwater quantitative and chemical status
according to the Water Framework Directive and therefore not being able to use the
groundwater as drinking water or industrial water resource. A combination of 18O/2H, 3H,
3H/3He and in some cases additional CFC, SF6, 85Kr and 35S measurements allow to
calculate reliable MRTs in 20 groundwater bodies covering 13% (approx.10719 km2) of the
Austrian territory. Altogether 401 groundwater wells and springs from the existing
groundwater monitoring network were analysed for δ18O (n=1500), 3H (n=800)
and 3He (n=327) since 2006. Considering both the fact that monitoring wells may
have multiple or long well screens and the inherent uncertainties of groundwater
age dating techniques, age estimations were classified into 5 categories of short
(Â50years) mean
residence times for each monitoring site. Subsequently, median values of the MRT
categories were assigned to each investigated groundwater body. These are valuable
information to fix extraction rates, to set measures to improve the land use and
groundwater protection and to validate hydrogeological concepts. Generally, MRTs of
groundwater bodies increase from shallow Alpine groundwater bodies over deeper Alpine
valley-aquifers to longer MRTs in the Pannonian climate range in the east of Austria. |
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