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| Titel |
Process-based karst modelling to relate hydrodynamic and hydrochemical characteristics to system properties |
| VerfasserIn |
A. Hartmann, M. Weiler, T. Wagener, J. Lange, M. Kralik, F. Humer, N. Mizyed, A. Rimmer, J. A. Barberá, B. Andreo, C. Butscher, P. Huggenberger |
| 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 ; 17, no. 8 ; Nr. 17, no. 8 (2013-08-23), S.3305-3321 |
| Datensatznummer |
250085917
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| Publikation (Nr.) |
 copernicus.org/hess-17-3305-2013.pdf |
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| Zusammenfassung |
| More than 30% of Europe's land surface is made up of karst exposures. In
some countries, water from karst aquifers constitutes almost half of the
drinking water supply. Hydrological simulation models can predict the
large-scale impact of future environmental change on hydrological variables.
However, the information needed to obtain model parameters is not available
everywhere and regionalisation methods have to be applied. The responsive
behaviour of hydrological systems can be quantified by individual metrics,
so-called system signatures. This study explores their value for
distinguishing the dominant processes and properties of five different karst
systems in Europe and the Middle East. By defining ten system signatures
derived from hydrodynamic and hydrochemical observations, a process-based
karst model is applied to the five karst systems. In a stepwise model
evaluation strategy, optimum parameters and their sensitivity are identified
using automatic calibration and global variance-based sensitivity analysis.
System signatures and sensitive parameters serve as proxies for dominant
processes, and optimised parameters are used to determine system properties.
By sensitivity analysis, the set of system signatures was able to
distinguish the karst systems from one another by providing separate
information about dominant soil, epikarst, and fast and slow groundwater
flow processes. Comparing sensitive parameters to the system signatures
revealed that annual discharge can serve as a proxy for the recharge area,
that the slopes of the high flow parts of the flow duration curves correlate
with the fast flow storage constant, and that the dampening of the isotopic
signal of the rain as well as the medium flow parts of the flow duration
curves have a non-linear relation to the distribution of groundwater storage
constants that represent the variability of groundwater flow dynamics. Our
approach enabled us to identify dominant processes of the different systems
and provided directions for future large-scale simulation of karst areas to
predict the impact of future change on karst water resources. |
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