Updating prior geologic uncertainty with GPR traveltime tomographic data

ENIGMA IT

Prior uncertainty investigation of density-viscosity dependent joint transport of heat and solute in alluvial sediments

Joint heat and solute tracer tests allow to add diffusion and conduction information to the solute advection-dispersion and help imaging preferential pathways in heterogeneous aquifers. We perform a joint interpretation of heat and solute tracer tests combining deterministic modeling and Bayesian Evidential Learning. The results show a strong influence of the water viscosity. The stochastic simulations highlight the influence of spatial and parameter uncertainty on the resulting breakthrough curves, stressing the need for realistic uncertainty quantification.Joint heat and solute tracer test inversion for imaging preferential pathway

How informative are single well tracing experiments? : an assessment using Bayesian evidential learning

ATHEN

Chemically Fueled Autonomous Sol→Gel→Sol→Gel→Sol Transitions

Complex non-equilibrium phase behaviors are a hallmark of natural self-assembling systems. Here we show how intricate phase transitions can be achieved through a chemically fueled reaction cycle to yield autonomous sol→gel→sol→gel→sol transitions. A relay of chemical transformations based on thiazinane metathesis leads to two consecutive transient gelations in a closed system. Within seconds of fuel addition to deactivated thiazinane monomers, an imine-based hydrogel forms that consists of fibrillar microspheres. This gel quickly loses its mechanical strength and forms a solution, from which a second aldehyde-based gel nucleates and remains stable for over one day. Overall, our reaction cycle gives rise to two consecutive re-entrant phase transitions without any experimental intervention.N.S would like to acknowledge the support from Generalitat Valenciana (Conselleria de Innovación, Universidades, Ciencia y Sociedad Digital) for CIDEGENT PlaGenT grant no. CIDEXG/2022/16 for the project PRONESS. T.M.H. would like to acknowledge funding from ERC-2017-STG “Life-Cycle” (757910) We acknowledge the help from Cyril Antheaume at ISIS, University of Strasbourg, and Cristian Vicent Barrera and Servei Central d'Instrumentació Científica (SCIC) at Universitat Jaume I, Spain for NMR and LCMS techniques

Combined inversion of land and marine electrical resistivity tomography for submarine groundwater discharge and saltwater intrusion characterization

Electrical resistivity tomography (ERT) is particularly suited for the characterization of saltwater intrusion and submarine freshwater discharge, given its sensitivity to the electrical conductivity of pore water. A comprehensive survey might combine land ERT collected during low tide and marine ERT acquired with lower sensitivity due to the presence of a seawater layer, most often, inverted separately. In this contribution, we propose a new methodology to jointly invert land and marine ERT acquired along a same profile, bringing them to a common situation at high tide. We first estimate the electrical resistivity distribution under the land profile. Then, we compute a corrected data set for land ERT, simulating a data set collected with the same level of water as the marine ERT. Finally, both land and marine ERT data sets are inverted jointly. We show that the approach allows to better image the freshwater/saltwater distribution across the shoreline