Options
Perrochet, Pierre
Résultat de la recherche
Modelling of the predictive hydrogeological impacts of the radwaste geological repository construction on limestone aquifers of the Meuse/Haute-Marne site (France)
2013-9-2, Benabderrahmane, Hakim, Kerrou, Jaouhar, Deman, Gregory, Tacher, Laurent, Cornaton, Fabien, Perrochet, Pierre
Simulation de la salinisation des eaux souterraines par recyclage du sel dans les zones irriguées
2005, Milnes, Ellen, Perrochet, Pierre
Radionuclide release and transport from nuclear underground tests performed at Mururoa and Fangataufa - predictions under uncertainty
1999, Pfingsten, Wilfried, Hadermann, Jörg, Perrochet, Pierre
In the context of a study by the International Geomechanical Commission (IGC) and the International Atomic Energy Agency (IAEA) on the effects of nuclear tests at the: atolls of Mururoa and Fangataufa, release to the biosphere is estimated for 35 radionuclides originating from 147 nuclear underground tests. Based on a qualitatively characterised hydrogeological situation of atolls and relatively scarce site-specific data, a model chain was developed to conservatively estimate the radionuclide fluxes via groundwater, from their sources, the explosion cavities. towards the biosphere, the ocean or lagoon. Finite element hydro-thermal modelling was used to describe water flow. Parameters were calibrated by a very few measured pre-test temperature profiles in bore holes. The impact of the tests on groundwater flow and mechanical impact on rock was considered. Estimates were made to quantify spatial extensions and temporal evolution of impact by using measurements on refilling rate of the cavities. Tests were categorised according to their specific yield and location although detailed data were missing. A base case parameter set was defined for the hydraulic conditions and for the initial radionuclide inventory of individual tests. Models were used to describe the concentration of radionuclides in the cavities as a function of time. Radionuclide transport from the cavities to the biosphere was represented by two different approaches: a double porosity model for the fractured volcanic rock and a single porosity model for the overlaying, highly porous carbonates. Results consist of conservative estimates on radionuclide release into the environment, or concentration in the lagoon or ocean water. Their sensitivity was investigated using different models and parameters. A few measured data (concentrations in a few cavities, in the deep carbonates and in the lagoons for selected radionuclides, such as H-3, C-14, Cl-36, Sr-90, I-129, Cs-137(239), Pu-240 and Am-241) were available for a comparison with the calculations. In view of the lack and uncertainty of site-specific data, the agreement is of acceptable quality. (C) 2001 Elsevier Science B.V. All rights reserved.
Analysis and evaluation of hydraulic impacts of the shafts and the tunnel access to radwaste repository on the Meuse/Haute-Marne site by the use of finite element variably saturated flow model
2012-10-22, Kerrou, Jaouhar, Cornaton, Fabien, Tacher, Laurent, Benabderrahmane, Hakim, Perrochet, Pierre
Reservoir theory, groundwater transit time distributions, and lumped parameter models
1999, Etcheverry, David, Perrochet, Pierre
Etude comparative de modèles de transport de soluté applliquée aux milieux discontinus
1992, Rossier, Yvan, Perrochet, Pierre
Stochastic modelling of the Oxfordian and Dogger aquifers heterogeneity and evaluation of its impacts on the groundwater flow and transport predictions in the Meuse/Haute-Marne area
2012-10-22, Kerrou, Jaouhar, Benabderrahmane, Hakim, Perrochet, Pierre
Error propagation in the Newton-based solution control of unsaturated flow
1999, Diersch, Hans-Jörg, Perrochet, Pierre, Stauffer, Fritz, Kinzelbach, Wolfgang, Kovar, Karel, Hoehn, Eduard
The Newton method represents the numerical core of the primary variable switching technique (PVST) which has been shown to be superior to conventional approaches in both unsaturated flow and multiphase flow modelling. In the context of PVST, empirically controlled strategies in time are rather common, where the Newton convergence is attempted for a possibly large step size. This technique is known as the target-based full Newton (TBFN) time stepping strategy. In comparison to adaptive techniques satisfying a predefined discretization error, the TBFN results can be inaccurate in spite of the convergence achieved in the Newton method. The present paper aims to analyse the cause of discrepancies in simulating unsaturated flows. This is done by comparison of analytical solutions which are based on exponential constitutive laws.