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Contribution à l'Hydrogéodesie

Abstract : The redistribution of water masses on the earth crust induces a measurable contribution to ground geodesy observations. This fact may be approached from two points of view that underline the interest of coupling hydrology and geodesy. On the one hand, when looking for delicate internal processes, the contribution of hydrological noise should be accounted for in geodetic time-series. On the other hand, as geodesy is sensitive to water storage variations, it could thus become a tool to provide additional information for a better understanding of hydrological processes. We propose a methodology to physically model the hydrological contribution to geodetic observations, based on a 3-step approach : 1) Determine the deformation process and control the mechanical (or dynamical) behavior with respect to the instrument ; 2) Calculate the amount of water in the hydrological unit by using hydrological models that are adapted to the spatial sensitivity of the instrument ; and 3) Evaluate the position of water masses. Two test sites located in the east of France are considered : a 108-km2
catchment in the Vosges Moutains hosting a 100-m long hydrostatic tiltmeter and a loess hill near Strasbourg hosting a superconducting gravimeter. The good agreement between geodetic measurements and hydrological modeling enable to validate the proposed methodology but also underline a major difficulty : all environmental signals are correlated and they mix in geodetic measurements, especially at annual time scales. As a consequence, modeling the effect of all environmental signals is a necessary step to turn geodetic instruments into hydrological tools
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Contributor : Laurent Longuevergne <>
Submitted on : Saturday, September 6, 2008 - 10:18:57 AM
Last modification on : Wednesday, October 14, 2020 - 3:52:19 AM
Long-term archiving on: : Thursday, June 3, 2010 - 8:59:06 PM

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  • HAL Id : tel-00319205, version 1

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Laurent Longuevergne. Contribution à l'Hydrogéodesie. Géophysique [physics.geo-ph]. Université Pierre et Marie Curie - Paris VI, 2008. Français. ⟨tel-00319205⟩

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