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Renard, Philippe
Nom
Renard, Philippe
Affiliation principale
Fonction
Directeur de Recherche
Email
Philippe.Renard@unine.ch
Identifiants
RĂ©sultat de la recherche
11 RĂ©sultats
Voici les éléments 1 - 10 sur 11
- PublicationMétadonnées seulementMultiresolution Approach to Condition Categorical Multiple-Point Realizations to Dynamic Data With Iterative Ensemble Smoothing(2023-1-19)
; ; A new methodology is presented for the conditioning of categorical multiple-point statistics (MPS) simulations to dynamic data with an iterative ensemble smoother (ES-MDA). The methodology relies on a novel multiresolution parameterization of the categorical MPS simulation. The ensemble of latent parameters is initially defined on the basis of the coarsest-resolution simulations of an ensemble of multiresolution MPS simulations. Because this ensemble is non-multi-Gaussian, additional steps prior to the computation of the first update are proposed. In particular, the parameters are updated at predefined locations at the coarsest scale and integrated as hard data to generate a new multiresolution MPS simulation. The performance of the methodology was assessed on a synthetic groundwater flow problem inspired from a real situation. The results illustrate that the method converges towards a set of final categorical realizations that are consistent with the initial categorical ensemble. The convergence is reliable in the sense that it is fully controlled by the integration of the ES-MDA update into the new conditional multiresolution MPS simulations. Thanks to a massively reduced number of parameters compared to the size of the categorical simulation, the identification of the geological structures during the data assimilation is particularly efficient for this example. The comparison between the estimated uncertainty and a reference estimate obtained with a Monte Carlo method shows that the uncertainty is not severely reduced during the assimilation as is often the case. The connectivity is successfully reproduced during the iterative procedure despite the rather large distance between the observation points. - PublicationMétadonnées seulement
- PublicationMétadonnées seulement
- PublicationMétadonnées seulementThe hydrogeological compiler. A step towards Groundwater Integrated Modeling(2007)
; Alcolea, Andrés - PublicationMétadonnées seulement
- PublicationMétadonnées seulement
- PublicationMétadonnées seulementHydrological balance modelling of the southern Aral Sea between 1993 and 2001(2005)
;Gascoin, S.Since the beginning of the 1990s, the Aral Sea is made of two separate entities: the Small Aral in the north and the Great Aral in the south. In this study, the water and salt balance of the Great Aral is analysed using newly available data: on the one hand, altimetric data of the sea level provided by the TOPEX/Poseidon satellite; and on the other, climate data provided by the ECMWF and NOAA within the framework of global climate re-analysis. These data indicate that the Great Aral received a mean groundwater inflow of about 4 km(3) year(-1) between 1993 and 2001. Without this contribution, the Aral Sea would disappear even faster than is being observed today. Moreover, the temporal resolution of the data shows a systematic phase difference between the model prediction and satellite measurements. This phase shift is considered to be due to the formation of temporary lakes between the last station measuring the Amu-Darya discharge and its mouth in the Great Aral. - PublicationMétadonnées seulementEnvironmental isotopes and hydrochemistry as indicators for ground water recharge to fractured granite(2005)
;Ofterdinger, U S ;Balderer, Werner ;Loew, S - PublicationMétadonnées seulement
- PublicationMétadonnées seulementA fast algorithm for the estimation of the equivalent hydraulic conductivity of heterogeneous media(2000-1-10)
; ;Le Loc'h, Gaëlle ;Ledoux, Emmanuel ;De Marsily, GhislainMackay, Rae