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| Titel |
Integrating field and numerical modeling methods for applied urban karst hydrogeology |
| VerfasserIn |
J. Epting, D. Romanov, P. Huggenberger, G. Kaufmann |
| 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 ; 13, no. 7 ; Nr. 13, no. 7 (2009-07-15), S.1163-1184 |
| Datensatznummer |
250011938
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| Publikation (Nr.) |
 copernicus.org/hess-13-1163-2009.pdf |
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| Zusammenfassung |
Infrastructures constructed on unstable geologic formations are prone to
subsidence. Data have been collected in the context of an upgrading project
for a highway located beside a river dam constructed on gypsum-bearing
formations. Surface water infiltrates upstream of the dam, circulates
through the gravel deposits and into the weathered bedrock around and
beneath the dam, and exfiltrates downstream into the river. As a result, an
extended weathering zone within the bedrock and preferential flow paths
within voids and conduits developed as part of a rapidly evolving karst
system. Enhanced karstification in the soluble units of the gypsum-bearing
formations resulted in subsidence of the dam and the highway.
Since 2006, changes in the groundwater flow regime have been investigated by
different methods that allowed the evaluation of the long-term performance
of the infrastructures. Geological (outcrops, lithostratigraphic information
from boreholes), hydrometrical (extensive groundwater monitoring, dye tracer
tests) and hydrogeophysical (Electrical Resistivity Tomography, ERT) data
were integrated into high-resolution 3-D hydrogeological and 2-D karst
evolution models. The applied methods are validated and the sensitivity of
relevant parameters governing the processes determined.
It could be demonstrated that the applied methods for karst aquifer
characterization complement each other. Short-term impacts and long-term
developments on system-dynamics and the flow regime could be evaluated. This
includes the description of the transient character of the flow regime
during and after episodic flood events (surface-groundwater interaction,
conduit and diffuse model outflow) as well as the evaluation of time scales
for karst evolution. Results allow the optimization of investigation methods
for similar subsidence problems, ranging from general measurements and
monitoring technologies to tools with predictive utility. |
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