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| Titel |
Karstification beneath dam sites: From conceptual models to realistic scenarios |
| VerfasserIn |
Thomas Hiller, Georg Kaufmann, Douchko Romanov |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250033430
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| Zusammenfassung |
| Dam sites located above soluble rock such as limestone or gypsum can leak in relatively short
times (tenths of years), when compared to the natural time scale of karstification
(10.000-100.000 years). The reason for this leakage is the high hydraulic gradient imposed by
the reservoir that drives aggressive water through the fracture and fissure system of the
bedrock and this aggressive water dissolves the rock and increases permeability fairly
fast. Thus, on the one hand water losses through enlarged fractures can become a
problem for the reservoir. On the other hand, the void space itself can be a risk for
the dam structure above. This may have unpredictable ecological and economical
consequences.
We present a three-dimensional conceptual model study of karstification in dam-site
areas on limestone bedrock. We compare our three-dimensional model to a standard
two-dimensional dam site model to verify the results of our code. We further carry out a
sensitivity analysis on the physical and chemical parameters driving the karstification to
derive an empirical formulation of the breakthrough time TB. In a next step we
implement a statistical fracture network and topography to approach a more realistic
scenario. Finally we show the results of a three dimensional model based on a real dam
site. |
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