Environmental Earth Sciences

, Volume 65, Issue 8, pp 2377–2389 | Cite as

Identification of a karst system’s intrinsic hydrodynamic parameters: upscaling from single springs to the whole aquifer

  • Andreas Hartmann
  • Martin Kralik
  • Franko Humer
  • Jens Lange
  • Markus Weiler
Special Issue

Abstract

For water management purposes, information about an entire aquifer system is generally more important than information about a specific spring. Since a karstic aquifer system might drain to several outlets, conclusions derived from a single spring can be misleading for characterization and modeling. In this study we apply a conceptual model to an Alpine dolomite karst system in Austria. The particular challenge was that several small springs with strongly varying hydrological behavior and diffuse flow into surrounding streams drain this system. Instead of applying the model to a single spring, it was calibrated simultaneously to several observations within the system aiming to identify the karst system’s intrinsic hydrodynamic parameters. Parameter identification is supported by modeling the transport of water isotopes (δ18O). The parameters were transferred to the whole system with a simple upscaling procedure and a sensitivity analysis was performed to unfold influence of isotopic information on parameter sensitivity and simulation uncertainty. The results show that it is possible to identify system intrinsic parameters. But the sensitivity analysis revealed that some are hardly identifiable. Only by considering uncertainty reasonable predictions can be provided for the whole system. Including isotopic information increases the sensitivity of some intrinsic parameters, but it goes along with a sensitivity decrease for others. However, a possible reduction of prediction uncertainty by isotopic information is compensated by deficiencies in the transport modeling routines.

Keywords

Karst aquifer Karst modeling Water isotopes Solute transport modeling Upscaling Rainfall-runoff modeling 

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Andreas Hartmann
    • 1
  • Martin Kralik
    • 2
  • Franko Humer
    • 2
  • Jens Lange
    • 1
  • Markus Weiler
    • 1
  1. 1.Institute of HydrologyFreiburg UniversityFreiburgGermany
  2. 2.Umweltbundesamt, Environment Agency AustriaViennaAustria

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