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Communication Dans Un Congrès Année : 2014

Sensitivity analysis of hydrological modelling to climate forcing in a semi-arid mountainous catchment.

Denis Ruelland
A. Dezetter
Paul Hublart
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Résumé

This study analyses the sensitivity of a hydrological model to different ways of interpolating climate forcing on the Elqui basin (5660 km2 ) in the Chilean Andes. A 36-year period (1976–2011) was chosen in order to account for the hydro-climatic variability. Precipitation and using the inverse distance weighted methods were interpolated on a 5 × 5 km grid based on 12 and eight stations, respectively. Elevation effects on precipitation and temperature distribution were considered using a digital elevation model. Two precipitation datasets (with and without a mean altitudinal gradient) and three temperature datasets (using constant or monthly lapse rates based on altitudinal bands) were computed. All dataset combinations were assessed through the calibration of the GR4j model including a snow reservoir. Calibration was performed by the succession of Rosenbrock and simplex algorithms using a multi-objective function. Results show that the dataset based on a constant lapse rate of 6.5°C/km for temperature and no elevation effects for precipitation is sufficient to accurately simulate discharge and the snowmelt regime of the catchment over the last 30 years.
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Dates et versions

hal-02094149 , version 1 (09-04-2019)

Identifiants

  • HAL Id : hal-02094149 , version 1

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Denis Ruelland, A. Dezetter, Paul Hublart. Sensitivity analysis of hydrological modelling to climate forcing in a semi-arid mountainous catchment.. 7th World FRIEND-Water Conference on Hydrology in a Changing World: Environmental and Human Dimensions, Oct 2014, Montpellier, France. ⟨hal-02094149⟩
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