Local and global hydrological contributions to gravity variations observed in Strasbourg - Archive ouverte HAL Access content directly
Journal Articles Journal of Geodynamics Year : 2009

Local and global hydrological contributions to gravity variations observed in Strasbourg

(1) , (2) , (1) , (3) , (2) , (2) , (2) , (2)
1
2
3

Abstract

We investigate the contribution of local and global hydrology to the superconducting gravimeter (SG) installed in the Strasbourg observatory.Adeterministic approach is presented to account for the contribution of water storage variations in the soils in the vicinity of the gravimeter: both amount and distribution of water masses are determined before calculating Newtonian attraction. No adjustment is performed on gravity time series. Two multi-depth Frequency Domain Reflectometer (FDR) probes have been installed to monitor the amount of water stored in the soil layer above the gravimeter. Since August 2005, they have been monitoring the variation of the water content of the entire soil thickness. Several investigations have been undertaken in order to estimate the distribution of water masses: a precise local DEM (Digital Elevation Model) has been determined using differential GPS. The geometry and heterogeneity of the soil layer have been evaluated thanks to geophysical and geomechanical prospections. The comparison between observed and modelled gravity variations shows that daily up to seasonal variations are in good agreement. For long-term variations, deep water storage and other processes have to be modelled to explain recorded gravity variations.
Fichier principal
Vignette du fichier
ETS2008_longuevergne.pdf (537.32 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-00707984 , version 1 (14-06-2012)

Identifiers

Cite

Laurent Longuevergne, J. P. Boy, Nicolas Florsch, Daniel Viville, Gilbert Ferhat, et al.. Local and global hydrological contributions to gravity variations observed in Strasbourg. Journal of Geodynamics, 2009, 48, pp.189-194. ⟨10.1016/J.JOG.2009.09.008⟩. ⟨hal-00707984⟩
197 View
411 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More