%0 Conference Proceedings %F Poster %T Correlation between changes in water storage and deformation transients in karst systems: new insights from the European Alps %+ Géosciences Rennes (GR) %+ Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Roma (INGV) %A Pintori, Francesco %A Longuevergne, Laurent %A Serpelloni, Enrico %A Elina Belardinelli, Maria %A Al., Et %< avec comité de lecture %B European Geosciences Union General Assembly 2018 %C Vienne, Austria %V 20 %P 2018-4272-1 %8 2018-04-08 %D 2018 %Z Sciences of the Universe [physics]/Earth SciencesConference poster %X We describe and discuss a hydrological transient deformation signal detected in geodetic measurements using ablind source separation algorithm. Space geodetic methods (GPS and SAR) have demonstrated their ability inmeasuring ground deformation associated with precipitation and groundwater redistribution at different spatial andtemporal scales. We considered the results of a variational Bayesian Independent Component Analysis appliedto the ground displacements time-series obtained from the analysis of continuous GPS stations operating in theEastern Southern Alps and northern Dinarides. This analysis highlighted both annual common mode componentsignals and a time-variable, non-cyclic signal characterized by a spatially variable response in the horizontal components.This latter signal has larger amplitudes in three karst areas of the study region. The GPS stations respondto this signal by moving in opposite direction, reversing the sense of movement in time, implying a successionof extensional/compressional strains, with variable amplitudes through time, oriented normal to rock fractures inkarst areas. Here we focus on the Val Belluna (i.e. Piave river basin) and the pedemountain front of the VenetianSouthern Alps, and tested the hypothesis that the succession of horizontal extensions and contractions recordedby the GPS stations are caused by the variation of the water storage in the hydrological basin of this area. In ahydrological basin it is possible to define the storage variation as the difference between the total precipitation andthe sum of real evapotranspiration and river discharge. In this work we used different hydrological models thatare able, once calibrated on existing data, to estimate the actual evapotranspiration from potential evapotranspirationdata. In addition, these models can describe the behavior of the basin also in the past, when no river-flowsdata were available. The only input data needed are precipitation and potential evapotranspiration and the modelitself calculates the discharge, the storage and the actual evapotranspiration values. We found an excellent agreementbetween the temporal evolution of the water storage and the ten-year-long temporal evolution of the transientgeodetic deformation signal. Then, this result provides new insights on the relation between water redistributionand ground displacements. We also found that the horizontal deformation can be explained by pressure changesassociated with variable water levels within vertical fractures in the vadose zones of karst systems. %G English %L insu-01767670 %U https://insu.hal.science/insu-01767670 %~ INSU %~ UNIV-RENNES1 %~ UR2-HB %~ CNRS %~ GR %~ OSUR %~ UR1-HAL %~ UR1-SDLM %~ GR-DIMENV %~ UNIV-RENNES2 %~ TEST-UR-CSS %~ UNIV-RENNES %~ INRAE %~ UR1-ENV %~ GR-ET %~ TEST3-HALCNRS %~ TEST4-HALCNRS %~ TEST5-HALCNRS