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Cinquante ans de processus hydrologiques observés dans des petits bassins versants méditerranéens : vers une raréfaction de la ressource en eau ?

Abstract : The Réal Collobrier hydrological observatory in southeastern France close to the Mediterranean coast, managed by Irstea since 1966, constitutes a benchmark site for regional hydro-climatology. Because of the dense network of stream gauges and raingauges available, this site provides a unique opportunity to evaluate long term hydro-meteorological Mediterranean trends. The vegetation is composed of forest mainly calcified on crystalline soils (maquis of heath, cork-oak, maritime pine and chestnut). Direct human influence has been negligible over the past 50 years. The land use/land cover has remained almost unchanged, with the notable exception of a wildfire in 1990 that impacted a small sub-catchment. Therefore changes in the hydrological response of the catchments are caused by changes in climate and/or physical conditions. This study investigates changes in observational data using up to 50-year daily series of precipitation and streamflow. The analysis used several climate indices describing distinct modes of variability, at inter-annual and seasonal time scales. Trends were assessed by the Mann-Kendall test. The analysis also used hydrological indices describing drought events based on daily data for a description of low flows, in particular in terms of timing and severity. The analysis shows that there is a marked tendency towards a decrease in the water resources of the Réal Collobrier catchment in response to climate trends, with a increase in drought severity and duration. But the changes are variable among the sub-catchments according to their own hydrological functioning.
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https://hal.inrae.fr/hal-03161125
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Submitted on : Friday, March 5, 2021 - 5:05:13 PM
Last modification on : Tuesday, September 7, 2021 - 3:44:46 PM
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Nathalie Folton, Éric Martin, Patrick Arnaud, Mathieu Tolsa. Cinquante ans de processus hydrologiques observés dans des petits bassins versants méditerranéens : vers une raréfaction de la ressource en eau ?. La Houille Blanche - Revue internationale de l'eau, EDP Sciences, 2020, pp.17-27. ⟨10.1051/lhb/2020048⟩. ⟨hal-03161125⟩

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