Absolute gravity monitoring of water storage variation in a karst aquifer on the larzac plateau (Southern France)

Jacob, Thomas; Bayer, R.; Chéry, Jean; Jourde, Hervé; Moigne, Nicolas Le; Boy, Jean‐Paul; Hinderer, J.; Luck, B.; Brunet, P

doi:10.1016/j.jhydrol.2008.06.020

Cited by 82 publications

(105 citation statements)

References 31 publications

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“…A simple conservation of mass energy could be applied to this scenario to ascertain inputs by precipitation and outputs as spring flow ( Xu and Beekman, 2003). Three absolute gravimeters with rainfall stations at each location were utilised for data generation (Jacob et al, 2008). Gravity variation is considered to be a major factor for soil moisture at the local scale, and it was concluded, verifying observations by Cook (2003), that multiple parameter modelling is important for removing uncertainty with regards to variables affecting groundwater flow.…”

Section: Ground Based Gravimetry Applied To Hydrologymentioning

confidence: 69%

“…An important differentiation was made with regards to classification of groundwater flow systems relative to their proximity to the SG stations, namely regional and continental flow (Llubes et al, 2004). Furthermore, the importance of environmental data as well as an understanding of the geology and groundwater is critical for interpretation of SG data, as re-emphasized by Jacob et al (2008). In this respect assumptions that neglect vertical flow on a local scale in soil must be re-examined, as this has shown to be critical in soil moisture movement (Fetter, 1999).…”

Section: Ground Based Gravimetry Applied To Hydrologymentioning

confidence: 99%

“…A dolomitic aquifer, in the south of France, formed the focus of a gravity study by Jacob et al (2008). A simple conservation of mass energy could be applied to this scenario to ascertain inputs by precipitation and outputs as spring flow ( Xu and Beekman, 2003).…”

Section: Ground Based Gravimetry Applied To Hydrologymentioning

confidence: 99%

“…This in turn aids with correlation of the gravity signal to the hydrological modelling. Jacob et al (2008) have shown that gravity is an excellent tool for determining mass movement of fluids in the subsurface.…”

Section: Ground Based Gravimetry Applied To Hydrologymentioning

confidence: 99%

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Gravimetry and its application to geohydrology: a review

Mahed¹

2016

SA J of Geomatics

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Section: Ground Based Gravimetry Applied To Hydrologymentioning

confidence: 69%

Section: Ground Based Gravimetry Applied To Hydrologymentioning

confidence: 99%

Section: Ground Based Gravimetry Applied To Hydrologymentioning

confidence: 99%

Section: Ground Based Gravimetry Applied To Hydrologymentioning

confidence: 99%

See 2 more Smart Citations

Gravimetry and its application to geohydrology: a review

Mahed¹

2016

SA J of Geomatics

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“…D'un point de vue fréquentiel, la surcharge hydrologique est principalement apériodique en raison de la caractéristique aléatoire de la météorologie (précipitations), mais il y a toutefois des composantes saisonnières qui sont bien identifiées dans les mesures gravimétriques au sol et par satellite (Jacob et al 2008 ;Hinderer et al 2006).…”

Section: Surcharge Hydrologiqueunclassified

Analysis and filtering of the effect of tides on the hydrostatic levelling systems at CERN

et al. 2012

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RESUMELes géomètres de la section Survey de l'Organisation Européenne pour la Recherche Nucléaire (CERN) utilisent le nivellement hydrostatique HLS pour effectuer des alignements verticaux précis. Le HLS atteint des précisions micrométriques, ce qui lui permet d'être utilisé pour les expériences à but de physique fondamentale comme le Large Hadron Collider (LHC).HLS mesure certes des déformations qui ont pour conséquence de désaligner tout accélérateur de particules lié au sol, mais il mesure également d'autres phénomènes aux caractéristiques bien particulières. Parmi ces phénomènes mesurés, les marées terrestres représentent une part très largement majoritaire du signal. Leur effet sur les mesures HLS est périodique et engendre une inclinaison longue base qui n'aboutit pas au désalignement relatif des aimants constitutifs d'un accélérateur. Ce doctorat est inspiré des travaux déjà réalisés sur les inclinomètres longue base et décrit les effets mesurés par HLS afin de classer ces phénomènes selon qu'ils désalignent ou non un accélérateur de particules. Enfin, les outils et modèles pour prédire les effets maitrisables sont utilisés pour anticiper les différents signaux mesurés par les HLS installés au CERN.Mots clefs : Hydrostatic Levelling System (HLS), nivellement hydrostatique, inclinomètre, CERN, LHC, CLIC, alignement vertical, marées terrestres, surcharges, effets locaux, effets de cavité. 3/184 ABSTRACTThe surveyors of the Large Scale Metrology section of the European Organization for Nuclear Research (CERN) use hydrostatic levelling systems (HLS) to perform precise vertical alignment measurements. The HLS achieves micrometer accuracy, which allows it to be used for the fundamental physics experiments such as the Large Hadron Collider (LHC).An HLS measures the deformations that lead to the misalignment of any particle accelerator linked to the ground, but it also measures other phenomena with very particular characteristics. Among these measured phenomena Earth tides form the main part of the signal. Their effect on HLS measurements is periodic and produces a long baseline tilt that does not lead to a relative misalignment of the magnets that constitute the accelerator.The objectives of this doctoral research are to be able to predict the effects which do not disturb the relative alignment of a particle accelerator and to remove these signals from the HLS measurements. Indeed, the horizontal and vertical positioning tolerances to be respected in the realm of particle accelerators are becoming tighter and tighter. For example, the Compact Linear Collider (CLIC), currently the object of a feasibility study, requires a 3σ alignment accuracy of 10 μm in a sliding window of 200 m, in both the transverse and vertical directions. The HLS is a candidate for measuring the vertical alignment but the amplitude of the tidal effect is approximately +/-20 μm over 200 m, making it necessary to take into account this long baseline phenomenon for the instrument to meet the CLIC requirements.This doctoral thesis is inspired ...

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Water storage changes as a marker for base flow generation processes in a tropical humid basement catchment (Benin): Insights from hybrid gravimetry

Hector

Séguis

Hinderer

et al. 2015

Water Resources Research

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In basement catchments of subhumid West Africa, base flow is the main component of annual streamflow. However, the important heterogeneity of lithology hinders the understanding of base flow generation processes. Since these processes are linked with water storage changes (WSCs) across the catchment, we propose the use of hybrid gravity data in addition to neutron probe-derived water content and water levels to monitor spatiotemporal WSC of a typical crystalline basement headwater catchment (16 ha) in Benin. WSC behaviors are shown to provide insights into hydrological processes in terms of water redistribution toward the catchment outlet. Hybrid gravimetry produces gravity change observations from time-lapse microgravity surveys coupled with gravity changes monitored at a base station using a superconducting gravimeter and/or an absolute gravimeter. A dense microgravity campaign (70 surveys of 14 stations) covering three contrasted years was set up with a rigorous protocol, leading to low uncertainties (<2.5 lGal) on station gravity determinations (with respect to the network reference station). Empirical orthogonal function analyses of both gravity changes and WSCs from neutron probe data show similar spatial patterns in the seasonal signal. Areas where storage and water table show a capping behavior (when data reach a plateau during the wet season), suggesting threshold-governed fast subsurface redistribution, are identified. This observed storage dynamics, together with geological structures investigated by electrical resistivity tomography and drill log analysis, make it possible to derive a conceptual model for the catchment hydrology.

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Absolute gravity monitoring of water storage variation in a karst aquifer on the larzac plateau (Southern France)

Cited by 82 publications

References 31 publications

Gravimetry and its application to geohydrology: a review

Gravimetry and its application to geohydrology: a review

Analysis and filtering of the effect of tides on the hydrostatic levelling systems at CERN

Water storage changes as a marker for base flow generation processes in a tropical humid basement catchment (Benin): Insights from hybrid gravimetry

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