Journal article

Constraining hydrological model parameters using water isotopic compositions in a glacierized basin, Central Asia

  • He, Zhihua GFZ German Research Centre for Geosciences, Section Hydrology, Telegrafenberg, Potsdam, Germany
  • Unger-Shayesteh, Katy GFZ German Research Centre for Geosciences, Section Hydrology, Telegrafenberg, Potsdam, Germany
  • Vorogushyn, Sergiy GFZ German Research Centre for Geosciences, Section Hydrology, Telegrafenberg, Potsdam, Germany
  • Weise, Stephan M. UFZ Helmholtz Centre for Environmental Research UFZ, Department Catchment Hydrology, Halle, Germany
  • Kalashnikov, Olga GFZ German Research Centre for Geosciences, Section Hydrology, Telegrafenberg, Potsdam, Germany - CAIAG Central Asian Institute of Applied Geosciences, Department Climate, Water and Natural Resources, Bishkek, Kyrgyzstan
  • Gafurov, Abror GFZ German Research Centre for Geosciences, Section Hydrology, Telegrafenberg, Potsdam, Germany
  • Duethmann, Doris Institute of Hydraulic Engineering and Water Resources Management, Vienna University of Technology (TU Wien), Vienna, Austria
  • Barandun, Martina Department of Geosciences, University of Fribourg, Fribourg, Switzerland
  • Merza, Bruno University of Potsdam, Institute of Earth and Environmental Science, Potsdam, Germany
Show more…
    01.04.2019
Published in:
  • Journal of Hydrology. - 2019, vol. 571, p. 332–348
English Water stable isotope signatures can provide valuable insights into the catchment internal runoff processes. However, the ability of the water isotope data to constrain the internal apportionments of runoff components in hydrological models for glacierized basins is not well understood. This study developed an approach to simultaneously model the water stable isotopic compositions and runoff processes in a glacierized basin in Central Asia. The fractionation and mixing processes of water stable isotopes in and from the various water sources were integrated into a glacio- hydrological model. The model parameters were calibrated on discharge, snow cover and glacier mass balance data, and additionally isotopic composition of streamflow. We investigated the value of water isotopic compositions for the calibration of model parameters, in comparison to calibration methods without using such measurements. Results indicate that: (1) The proposed isotope-hydrological integrated modeling approach was able to reproduce the isotopic composition of streamflow, and improved the model performance in the evaluation period; (2) Involving water isotopic composition for model calibration reduced the model parameter uncertainty, and helped to reduce the uncertainty in the quantification of runoff components; (3) The isotope-hydrological integrated modeling approach quantified the contributions of runoff components comparably to a three-component tracer-based end-member mixing analysis method for summer peak flows, and required less water tracer data. Our findings demonstrate the value of water isotopic compositions to improve the quantification of runoff components using hydrological models in glacierized basins.
Faculty
Faculté des sciences et de médecine
Department
Département de Géosciences
Language
  • English
Classification
Hydrology
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/307694
Statistics

Document views: 9 File downloads:
  • bar_chm.pdf: 1