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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 20, issue 9
Hydrol. Earth Syst. Sci., 20, 3691–3717, 2016
https://doi.org/10.5194/hess-20-3691-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Hydrol. Earth Syst. Sci., 20, 3691–3717, 2016
https://doi.org/10.5194/hess-20-3691-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 08 Sep 2016

Research article | 08 Sep 2016

Reliability of lumped hydrological modeling in a semi-arid mountainous catchment facing water-use changes

Paul Hublart1,7, Denis Ruelland2, Inaki García de Cortázar-Atauri3, Simon Gascoin4, Stef Lhermitte5, and Antonio Ibacache6 Paul Hublart et al.
  • 1UM2, UMR HydroSciences Montpellier, Montpellier, France
  • 2CNRS, UMR HydroSciences Montpellier, Montpellier, France
  • 3INRA, US 1116 AGROCLIM, Avignon, France
  • 4CNRS, CESBIO, UMR 5126, Toulouse, France
  • 5Delft University of Technology, Department of Geoscience & Remote Sensing, Delft, the Netherlands
  • 6INIA, Colina San Joaquín s/n, La Serena, Chile
  • 7CEAZA, Raúl Bitrán s/n, La Serena, Chile

Abstract. This paper explores the reliability of a hydrological modeling framework in a mesoscale (1515 km2) catchment of the dry Andes (30° S) where irrigation water use and snow sublimation represent a significant part of the annual water balance. To this end, a 20-year simulation period encompassing a wide range of climate and water-use conditions was selected to evaluate three types of integrated models referred to as A, B and C. These models share the same runoff generation and routing module but differ in their approach to snowmelt modeling and irrigation water use. Model A relies on a simple degree-day approach to estimate snowmelt rates and assumes that irrigation impacts can be neglected at the catchment scale. Model B ignores irrigation impacts just as Model A but uses an enhanced degree-day approach to account for the effects of net radiation and sublimation on melt rates. Model C relies on the same snowmelt routine as Model B but incorporates irrigation impacts on natural streamflow using a conceptual irrigation module. Overall, the reliability of probabilistic streamflow predictions was greatly improved with Model C, resulting in narrow uncertainty bands and reduced structural errors, notably during dry years. This model-based analysis also stressed the importance of considering sublimation in empirical snowmelt models used in the subtropics, and provided evidence that water abstractions from the unregulated river are impacting on the hydrological response of the system. This work also highlighted areas requiring additional research, including the need for a better conceptualization of runoff generation processes in the dry Andes.

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Our paper explores the reliability of conceptual catchment models in the dry Andes. First, we show that explicitly accounting for irrigation water use improves streamflow predictions during dry years. Second, we show that sublimation losses can be easily incorporated into temperature-based melt models without increasing model complexity too much. Our work also highlights areas requiring additional research, including the need for a better conceptualization of runoff generation processes.
Our paper explores the reliability of conceptual catchment models in the dry Andes. First, we...
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