We find that horizontally layered models with moderate to high variance have the best resolved parameters. The variance, controlling the spreading rate of the solute, is the best constrained geostatistical parameter, followed by the integral scales in the vertical direction. Considering a perfect and known relationship between salinity and electrical conductivity at the point scale, we find that the horizontal equivalent electrical conductivity time-series best constrain the geostatistical properties. We use Approximate Bayesian Computation and the Kullback–Leibler divergence measure to quantify to what extent horizontal and vertical equivalent electrical conductivity time-series observed during tracer tests constrain the 2-D geostatistical parameters of multivariate Gaussian log-hydraulic conductivity fields. More on Anneka’s research project Author ENIGMA Posted on Categories Non classé Publication: Inferring geostatistical properties of hydraulic conductivity fields from saline tracer tests and equivalent electrical conductivity time-seriesīy Alejandro Fernandez Visentini, Niklas Linde, Tanguy Le Borgne, Marco Dentz Time-lapse vertical gravity gradient data can deliver additional information that can be used to constrain the subsurface water distribution. Furthermore, the potential use of monitoring the vertical gravity gradient in hydrogeophysical applications was assessed experimentally and using hydrogravimetrical modelling. The measurement of g was found to not be influenced by temperature and tilt changes.

We assess the performance of the absolute quantum gravimeter device AQG#B01, developed by Muquans, in view of its precision, stability, repeatability and of future terrain deployment. Quantum gravimeters provide the possibility of continuous, high-frequency absolute gravity monitoring without instrumental drift while remaining user-friendly and transportable. The gravitational attraction of the Earth (referred to as g) is measured with gravimeters. Gravimetry studies the variations of the Earth’s gravity field which can be linked to mass changes studied in various disciplines of the Earth sciences. Author ENIGMA Posted on Format Status Categories Non classé Congratulation Doctor Anne-Karin Cooke !ĮNIGMA fellow Anne-Karin Cooke successfully defended her thesis “Characterisation of a new mobile absolute quantum gravimeter: Application in groundwater storage monitoring” on Friday 30th October 2020 virtually from Montpellier University. The network ENIGMA gathers 21 partners (15 academic and 6 industrial) from 8 European countries.Įach of the 15 PhD students conducts the research work in 2 or 3 institutions, in collaboration with the industrial partners. The 15 young PhD students trained within the network contribute to develop the spatial representation of subsurface heterogeneity, fluxes, chemical reactions and microbial activity, through the integration of data and approaches from geophysics, hydrology, soil physics, and biochemistry. ENIGMA ITN is an Innovative Training Network funded by the European Commission.ĮNIGMA ITN ( European training Network for in situ ima Ging of dyna Mic processes in heterogeneous subsurf Ace environments) aims at training a new generation of young researchers in the development of innovative methods for imaging process dynamics in subsurface hydrosystems, in order to enhance understanding and predictive modelling capacities and to transfer these innovations to the economic sector.

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