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Title

Parameter transferability under changing climate: case study with a land surface model in the Durance watershed, France

Publication Year

2015

Author(s)
  • Magand, C.
  • Ducharne, A.
  • Le Moine, N.
  • Brigode, P.
Source
HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES Volume: 60 Issue: 7-8 Pages: 1408-1423 Published: 2015
ISSN
0262-6667 eISSN: 2150-3435
Abstract

In physically-based land surface models, the parameters can all be prescribed a priori but calibration can be used to enhance the realism of the simulations in well instrumented domains. In such a case, the transferability of calibrated parameters under non-stationary conditions needs to be addressed, especially in the context of climate change. To this end, we used the Catchment Land Surface Model (CLSM) in the Upper Durance watershed located in the French Alps, which experienced a significant increase in temperature over the last century. The CLSM is forced by a 50-year meteorological dataset of good quality. Four parameters of the CLSM (one related to snow processes and three to soil properties) are calibrated against discharge observations with a multi-objective algorithm. First, the robustness of the CLSM parameterizations is tested by the Differential Split Sample Test (DSST). The simulations show good performances over a wide range of retrospective climatic conditions, except when the parameters are calibrated over a period with a large contribution of snowmelt to annual mean discharge. Then, the use of a climate change scenario reveals that the parameterizations of soil moisture processes in the CLSM are responsible for an increasing dispersion among simulations when facing dry and warm conditions. However, the differences between the simulated changes of river discharge remain very small. This work shows that calibration conveys some uncertainties, but they are moderate in the studied case, and pertain to the most conceptual parameterizations of this physically-based model.

Author Keyword(s)
  • land surface model
  • multi-objective calibration
  • non-stationarity
  • climate change
  • DSST
KeyWord(s) Plus
  • MULTICRITERIA METHODS
  • DEPLETION CURVES
  • SVAT MODEL
  • CALIBRATION
  • CATCHMENT
  • VARIABILITY
  • RESOLUTION
  • RIVER
  • SNOW
  • UNCERTAINTY
ESI Discipline(s)
  • Engineering
  • Environment/Ecology
Web of Science Category(ies)
  • Water Resources
Adress(es)

[Magand, C.; Ducharne, A.; Le Moine, N.; Brigode, P.] UPMC, Paris, France

Reprint Adress

Magand, C (reprint author), UPMC, Paris, France.

Country(ies)
  • France
CNRS - Adress(es)

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Accession Number
WOS:000360222500017
uid:/87FK4CN5
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