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Tradeoffs  between temporal and spatial pattern calibration and their impacts on robustness  and transferability of hydrologic model parameters to ungauged basins            
  • +6
  • Mehmet Cüneyd Demirel,
  • Julian Koch,
  • Oldrich Rakovec,
  • Rohini Kumar,
  • Juliane Mai,
  • Sebastian Müller,
  • Stephan Thober,
  • Luis Samaniego,
  • Simon Stisen
Mehmet Cüneyd Demirel
Department of Civil Engineering, Istanbul Technical University

Corresponding Author:[email protected]

Author Profile
Julian Koch
Geological Survey of Denmark and Greenland
Oldrich Rakovec
Department Computational Hydrosystems, UFZ-Helmholtz Centre for Environmental, Faculty of Environmental Sciences, Czech University of Life
Rohini Kumar
Department Computational Hydrosystems, UFZ-Helmholtz Centre for Environmental
Juliane Mai
Department Computational Hydrosystems, UFZ-Helmholtz Centre for Environmental, Department of Civil and Environmental Engineering, University of Waterloo, Center for Scalable Data Analytics and Artificial Intelligence-ScaDS.AI
Sebastian Müller
Department Computational Hydrosystems, UFZ-Helmholtz Centre for Environmental
Stephan Thober
Department Computational Hydrosystems, UFZ-Helmholtz Centre for Environmental
Luis Samaniego
Department Computational Hydrosystems, UFZ-Helmholtz Centre for Environmental
Simon Stisen
Geological Survey of Denmark and Greenland

Corresponding Author:

Abstract

Optimization of spatially consistent parameter fields is believed to increase the robustness of parameter estimation and its transferability to ungauged basins. The current paper extends previous multi-objective and transferability studies by exploring the value of both multi-basin and spatial pattern calibration of distributed hydrologic models as compared to single-basin and single-objective model calibrations, with respect to tradeoffs, performance and transferability. The mesoscale Hydrological Model (mHM) is used across six large central European basins. Model simulations are evaluated against daily streamflow observations at the basin outlets and remotely sensed evapotranspiration patterns obtained with a two-source energy balance approach. Several model validation experiments are performed through combinations of single- (discharge) and multi-objective (discharge and spatial evapotranspiration patterns) calibrations with holdout experiments saving alternating basins for model evaluation. The study shows that there are very minimal tradeoffs between spatial and temporal performance objectives and that a joint calibration of multiple basins using multiple objective functions provides the most robust estimations of parameter fields that perform better when transferred to ungauged basins. The study indicates that particularly the multi-basin calibration approach is key for robust parametrizations, and that the addition of an objective function tailored for matching spatial patterns of ET fields alters the spatial parameter fields while significantly improving the spatial pattern performance without any tradeoffs with discharge performance. In light of model equifinality, the minimal tradeoff between spatial and temporal performance shows that adding spatial pattern evaluation to the traditional temporal evaluation of hydrological models can assist in identifying optimal parameter sets.
22 Aug 2023Submitted to ESS Open Archive
24 Aug 2023Published in ESS Open Archive