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Comment l'évolution de l'évaporation potentielle impacte les sécheresses

Abstract : Interannual variations in river flow are closely related to those of the climate, primarily variations in precipitation and in evaporation. While precipitation varies greatly from one year to the next, evaporation is slowly changing and its natural variations sometimes difficult to differentiate from the signal of the global warming. The evaluation of potential evaporation, used in hydrology to assess actual evaporation, and its impacts on droughts is difficult because this quantity is not directly measurable (or exceptionally) and it therefore almost always results from a model. To help us choose the the most reliable formulation of potential evaporation for future projections, we propose to evaluate the elasticity of the modulus of flow to precipitation and potential evaporation through a linear relationship, on a large set of French catchments for which long series of flows and climatic data are available. On this set of basins, we test a set of potential evaporation formulations popular in hydrology and we discuss the possibilities of identifying the most representative formula for the interannual variations of flow at the scale of France.
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https://hal.inrae.fr/hal-03278562
Contributor : Guillaume Thirel <>
Submitted on : Monday, July 5, 2021 - 4:52:39 PM
Last modification on : Tuesday, September 7, 2021 - 3:54:48 PM

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Paul Royer-Gaspard, Vazken Andréassian, Guillaume Thirel, Charles Perrin. Comment l'évolution de l'évaporation potentielle impacte les sécheresses. Colloque UNESCO-SHF : « Sécheresses 2019, Paris 11-12 et 13 décembre 2019 », Dec 2019, Paris, France. ⟨hal-03278562⟩

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