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Communication Dans Un Congrès Année : 2022

Analysis influence of evapotranspiration on superconducting gravity signal at daily time step

Résumé

;Estimating evapotranspiration (ET) is a primary challenge in modern hydrology. Hydrogravimetry is an integrative approach that provides highly precise continuous measurement of gravity acceleration. However, large-scale effects (e.g. tides, polar motion, atmospheric loading) limit the fine time-scale interpretation of this data and processing leads to residual signal noise. To circumvent this limitation, we exploited the difference between two superconducting gravimeters located 512 m apart on the same vertical. The difference calculation makes it possible to remove shared large-scale effects. Daily variation of this gravity difference is significantly correlated with daily evapotranspiration as estimated using the water balance model SimpKcET (p-value = 4.10<sup>-10</sup>). However, this approach is effective only during rain-free periods. In the future, comparison with direct ET measurements (e.g. eddy-covariance, scintillometer) may confirm and strengthen our interpretation. Improved hydrogravimetric data processing will allow to extend this approach to other experimental sites equipped with a single superconducting gravimeter.
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Dates et versions

hal-04217446 , version 1 (25-09-2023)

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Citer

Bertille Loiseau, Simon Carriere, Cédric Champollion, Chloé Ollivier, Nicolas Martin-StPaul, et al.. Analysis influence of evapotranspiration on superconducting gravity signal at daily time step. XIth Scientific Assembly of the International Association of Hydrological Sciences (IAHS 2022), May 2022, Montpellier, France. ⟨10.5194/iahs2022-366⟩. ⟨hal-04217446⟩
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