Inclinometry and geodesy: an hydrological perspective

Laurent Longuevergne (1) , Nicolas Florsch (1) , Frédéric Boudin (2) , T. Vincent (3) , M. Kammenthaler (3)

1 SISYPHE - Structure et fonctionnement des systèmes hydriques continentaux
2 IPGP - Institut de Physique du Globe de Paris
3 Particulier

Two orthogonal, precise and low drift tiltmeters have been installed in the Vosges mountains in order to study environmental surface loading. The first results show the great sensitivity (10¡10 radians), stability (negligible drift) of the instrument, and its ability to be used as a tool to study hydrological loading. This work focuses on local and regional hydrological physical modelling, with a stepwise refinement of mass balance calculations on a geodetic purpose. We show that meteorological forcing mainly drives stock variations inside a hydrological unit, it is therefore necessary to take great care of precipitation and evapotranspiration. Uncertainty assessment on stock variations is also raised, and shows that hydrological models bring good estimation of short term water stock variations, but that long term geodetic variations provide complementary information for stored water modelling.

Domaines: Interfaces continentales, environnement; Milieux et Changements globaux; Sciences de la Terre

Laurent Longuevergne, Nicolas Florsch, Frédéric Boudin, T. Vincent, M. Kammenthaler. Inclinometry and geodesy: an hydrological perspective. GGP Workshop, 2006, Jena, Germany. pp.11387-11398. ⟨hal-00710444⟩