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| Titel |
Applied dual porosity concept for large karst basins in the east Mediterranean |
| VerfasserIn |
A. Hartmann, J. Lange, A. Rimmer |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250019547
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| Zusammenfassung |
| One of the most problematic aspects of modeling karst hydrology is the “system
identification”, which is the conceptual structure of flow within a karstic system. In this
study we simulate the conceptual flow system of two large karstic springs, which
originate in the karstic region of the Hermon Mountain (Northern Israel). These
springs contribute 300 million m3 annually, nearly ~70% of the flow to the Upper
Catchment of the Jordan River. Our findings are supported by daily measurements of
spring discharge and weekly measurements of geochemical components over 35
years.
The model couples the groundwater flows of these springs with mixing equations, and
applied them simultaneously to both spring discharges and to three different solute
concentrations. The conceptual karstic groundwater routine includes two small and
fast-reacting reservoirs representing the springs’ conduit systems, and one large and
slow-reacting reservoir representing the fissured-porous system (dual porosity concept). Both
conduit reservoirs exchange flow with the fissured-porous system, which is linearly
dependent on their difference in hydraulic potential. Thus flow between the conduit
reservoirs and the fissured-porous reservoir is possible in both directions. Moreover,
based on the real hydrological system, it was assumed that one conduit reservoir
was located significantly higher than the conduit reservoir of the other. The model
enabled the simultaneous solution of the spring flows and concentration of Nitrate
[NO3-], Chloride [Cl-] and Sulfate [SO42-]. The multiple-response validation
indicated that it is most probable that the new model structure now considers the
significant and major processes taking place in the karst hydrological system of Mount
Hermon.
The successful application of the dual porosity concept suggests that the contributing
fissured-porous aquifer of both springs is the same, despite the obvious differences between
the nature of spring discharge, and some differences in their geochemistry.
ACKNOWLEDGMENT: This research is part of the GLOWA - Jordan River Project
funded by the German Ministry of Science and Education (BMBF), in collaboration with the
Israeli Ministry of Science and Technology (MOST). It was funded by the German Academic
Exchange Service (DAAD). |
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